Bearing housings

Split plummer block housings SNS

Split plummer block housings SNS:

• are designed in accordance with a modular concept and are highly versatile in application ➤ section
• are suitable for different bearing types and sizes with bore diameters from 115 mm to 530 mm ➤ section
• lead, as a result of their design, to optimised load distribution and thereby increase the rating life of the bearing by up to 50% ➤ Figure and ➤ section
• give a reduction, due to the lower replacement frequency of the bearing fitted, in total costs over the running time

Influence of housing design on the load distribution in the bearing Conventional plummer block housing with associated load distribution FAG plummer block housing SNS with associated load distribution

Housing design

Housings for aggressive environmental conditions

Split plummer block housings SNS are highly robust and therefore particularly suitable for aggressive environmental conditions such as those in mining applications ➤ Figure and ➤ Figure.

Split plummer block housings SNS..-H and SNS..-Z Housing design for labyrinth and Taconite seal

Split plummer block housings SNS..-B Housing design for Bold-on seal

Modular concept

The decisive factor is the outside diameter of the bearing

The housings are designed in accordance with a modular concept. Each housing can be fitted with rolling bearings of various diameter and width series if they have the correct outside diameter for the housing.

Seals are matched to the shaft diameter

Depending on their design, the bearings can be located either directly on the shaft or by means of an adapter sleeve. This gives different shaft diameters for the same bearing size. The spacings between the shaft and housing body are compensated by means of appropriately matched seals.

Longer bearing life

Bearing rating life up to 50% longer than with conventional plummer block housings

In the case of plummer block housings SNS, the life of the spherical roller bearings fitted is up to 50% longer than in the case of conventional plummer block housings. The increase in life is dependent on the application, the load and the bearing design. Calculation of the bearing life is based on the calculation software BEARINX. The reason for the longer bearing life is the optimised load distribution in the bearing that is achieved as a result of the new housing design ➤ Figure.

Conventional plummer block housings: unfavourable load distribution in the bearing

Conventional plummer block housings are designed such that the bearing load is introduced into the housing locating face by means of a support area directly below the bearing. If loading is in the main load direction, namely with an orientation vertical to the housing locating face, an unfavourable load distribution occurs in the bearing. Due to the narrow load zone, the load is distributed over only a small number of rolling elements, leading to a particularly high load maximum on the roller in the apex position.

Plummer block housings SNS: optimised load distribution

In the case of plummer block housings SNS, a material recess below the bearing distributes the support area over two symmetrically arranged support faces. This leads to a significant improvement in the load distribution in the bearing. The load zone is wider and the load is distributed more uniformly over several rolling elements. The maximum is now present on the two neighbouring rollers of the roller in the apex position and is reduced. This results in a significant increase in the fatigue life of the rolling bearings.

Advantages of detailed design

A large number of details in the housing design that are systematically matched to practical application allows a particularly flexible and economical usage of plummer block housings SNS ➤ Figure.

Advantages of detailed design Lubrication hole with long axial lubrication groove Pilot hole at predefined position for condition monitoring Grease outlet holes Indentations indicating shaft and bearing centres Inclined run-off areas Machined locating faces Prepared mounting points for condition monitoring Marking of housing halves Dismounting notches Overhang of upper housing section

Lubrication hole with long axial lubrication groove

A lubrication hole with a long axial lubrication groove in the upper housing section ensures supply of lubricant irrespective of bearing position to all bearing series that can be fitted. Suitable lubrication nipples are included in the scope of delivery.

Grease outlet holes

Grease outlet holes in the lower housing section allow the escape of used and superfluous grease during relubrication.

Indentations

Indentations in the lower housing section indicate the shaft and bearing centres in the housing. This allows rapid alignment and reduces mounting time.

Inclined run-off areas

Inclined run-off areas on the upper and lower housing section promote the removal of fluids and reduce deposits of contamination. This leads to reduced cleaning work and a lower risk of corrosion.

Machined locating faces

Machined locating faces on the lower housing section allow precise alignment of the housing. When the housing is painted, the locating faces are also provided with a universal paint coating. Since the locating faces are raised, strips can be used as an alignment aid. One-off alignment is sufficient to allow rapid interchange of the housing when necessary.

Prepared mounting points for condition monitoring

In order to allow the uncomplicated use of condition monitoring, the lower housing section has a connection facility on both sides for condition monitoring systems. Due to the thread M6 and a flattened area of diameter 26 mm, it is possible to directly connect FAG SmartCheck, a modular online measuring system for machine monitoring. Alternatively, other vibration sensors can also be connected.

If neither of the two connection points is accessible as a result of the adjacent construction, a further suitable connection point on the upper section is indicated by a cast-in pilot hole.

FAG SmartCheck must be ordered separately. Detailed information TPI 214 or http://www.schaeffler.de/std/1B6C.

Marking of housing halves

The upper housing section and lower housing section are matched to each other and must not be transposed with other housing halves. The serial numbering on both halves of the housing ensure their correction allocation. Furthermore, the serial numbering allows traceability and simplified documentation.

Dismounting notches

Recessed dismounting notches on the interface of the housing halves make it easier to remove the upper housing section.

Overhang of upper housing section

The overhang of the upper housing section prevents the collection of fluids and contaminants at the interface of the two housing halves. This leads to reduced cleaning work and a lower risk of corrosion.

Suitable bearings

Shaft diameters from 115 mm to 530 mm and from 4 7/16 inch to 19 1/2 inch

Split plummer block housings SNS are suitable for fitting with spherical roller bearings or toroidal roller bearings with a tapered or cylindrical bore ➤ Table. The range of shaft diameters is 115 mm to 530 mm and 4 ⁷/₁₆ inch to 19 ¹/₂ inch.

Bearing types and sizes

Bearing type	Size
Spherical roller bearings
with tapered bore and adapter sleeve	22232..-K to 22272..-K
with tapered bore and adapter sleeve	22326..-K to 22356..-K
with tapered bore and adapter sleeve	23036-K to 230/530..-K
with tapered bore and adapter sleeve	23134..-K to 23196..-K
with tapered bore and adapter sleeve	23232..-K to 23288..-K
with cylindrical bore	22232 to 22272
with cylindrical bore	22326 to 22356
with cylindrical bore	23036 to 230/530
with cylindrical bore	23134 to 23196
with cylindrical bore	23232 to 23288
with cylindrical bore	24036 to 240/530
split	230SM160 to 230SM410
split	230S.607 to 230S.1608
split	231SM150 to 231SM410
split	231S.515 to 231S.1500
split	232SM260 to 232SM340
split	232S.1200 to 232S.1308
Toroidal roller bearings
with tapered bore and adapter sleeve	C2232..-K to C2244..-K
with tapered bore and adapter sleeve	C2326..-K to C2356..-K
with tapered bore and adapter sleeve	C3036-K to C30/530..-K
with tapered bore and adapter sleeve	C3134..-K to C3196..-K
with tapered bore and adapter sleeve	C3232..-K to C3288..-K
with cylindrical bore	C2232 to C2244
with cylindrical bore	C2326 to C2356
with cylindrical bore	C3036 to C30/530
with cylindrical bore	C3134 to C3196
with cylindrical bore	C3232 to C3288
with cylindrical bore	C4036 to C40/530

Split spherical roller bearings

Unsplit spherical roller bearings with an adapter sleeve can be replaced by split spherical roller bearings ➤ Table. This gives a considerable reduction in the work associated with bearing replacement in numerous applications.

In order to ensure selection of the correct combination of housing and bearing when using split bearings, please contact Schaeffler.

The range of split spherical roller bearings is described in detail in a separate publication TPI 250.

Allocation of bearing and housing series

On the basis of the modular concept, one or more series of plummer block housings SNS are suitable for each series of spherical roller bearings ➤ Table to ➤ Table.

Plummer block housings SNS for spherical roller bearings with tapered bore and adapter sleeve

Bearing	Plummer block housing
Series	SNS2264		SNS30		SNS31			SNS32		SNS40
	Suffixes
	H	Z	H	Z	H	Z	B	H	Z	H	Z
222..-K	●	‒	●	‒	●	‒	‒	‒	‒	‒	‒
223..-K	‒	‒	●	‒	●	‒	‒	‒	‒	‒	‒
230..-K	‒	‒	●	‒	‒	‒	‒	‒	‒	‒	‒
231..-K	‒	‒	‒	‒	●	‒	●	‒	‒	‒	‒
232..-K	‒	‒	●	‒	‒	‒	‒	●	‒	‒	‒

● = suitable

Plummer block housings SNS for spherical roller bearings with cylindrical bore

Bearing	Plummer block housing
Series	SNS2264		SNS30		SNS31			SNS32		SNS40
	Suffixes
	H	Z	H	Z	H	Z	B	H	Z	H	Z
222	‒	●	●	‒	●	●	‒	‒	‒	‒	‒
223	‒	‒	●	‒	●	‒	‒	‒	‒	‒	‒
230	‒	‒	●	●	‒	‒	‒	‒	‒	‒	‒
231	‒	‒	‒	‒	●	●	‒	‒	‒	‒	‒
232	‒	‒	●	‒	‒	‒	‒	‒	●	‒	‒
240	‒	‒	●	●	‒	‒	‒	‒	‒	‒	●

● = suitable

Plummer block housings SNS for split spherical roller bearings

Bearing	Plummer block housing
Series	SNS2264		SNS30		SNS31			SNS32		SNS40
	Suffixes
	H	Z	H	Z	H	Z	B	H	Z	H	Z
230S	‒	‒	●	‒	‒	‒	‒	‒	‒	‒	‒
231S	‒	‒	‒	‒	●	‒	●	‒	‒	‒	‒
232S	‒	‒	‒	‒	‒	‒	‒	●	‒	‒	‒

● = suitable

Materials, corrosion protection

Material

The housing bodies are made from spheroidal graphite cast iron GJS‑400‑15 (suffix D).

Corrosion protection

All outer surfaces not machined by chip-forming methods and the locating surfaces on the lower housing section have a universal paint coating (colour RAL 7016, anthracite grey). The coating can be finished using all synthetic resin, polyurethane, acrylic, epoxy resin, chlorinated rubber, nitrocellulose and acid-hardening hammer tone finishes.

Inner and outer surfaces machined by chip-forming methods are provided with anti-corrosion protection that can be easily removed. It is recommended that only volatile solvents and lint-free cloths should be used.

Locating and non-locating bearings

Locating bearing arrangement by means of locating rings

The bearing seats in the housing are machined such that the bearings are movable and can thus function as non-locating bearings. Locating bearing arrangements can be achieved by the insertion of locating rings NFR on both sides of the bearing outer ring. Depending on the combination of housing and bearing, 2, 4 or 6 locating rings will be required ➤ dimension table. Locating rings must be ordered separately.

Load carrying capacity

Guide values

Guide values are given for the rupture load of plummer block housings SNS and the maximum load carrying capacity of connecting screws for the upper and lower housing sections, ➤ Figure and ➤ Table. The guide values are valid for purely static loading.

The guide values only apply if the flatness of the mounting surface in accordance with DIN EN ISO 1101 corresponds to the tolerance grade IT7 in accordance with DIN EN ISO 286-1 (measured across the diagonal). A precondition for supporting loads is that the housing base surface is completely and rigidly supported.

Safety factors

When determining the permissible static load, safety factors must be applied. For general machine building, the safety factor 6 relative to the housing rupture load is normally applied. Based on the precise calculation of the housing rupture loads using the Finite Element method and the use, as standard, of spheroidal graphite cast iron as the housing material, the safety factor 5 is sufficient for plummer block housings SNS.

A safety factor is not required for the values given for the load carrying capacity of the connecting screws.

If the housing is subjected to axial load, the permissible axial load of the bearing fitted must be taken into consideration. If the bearing is located on the shaft using an adapter sleeve, the axial retaining force of the bearing and adapter sleeve must also be taken into consideration.

If the load direction is between 55° and 120° or axial load is present, we recommend that the housings should be secured in the load direction by means of stops.

Load directions F for the guide values for the housing rupture load and the maximum load carrying capacity of the connecting screws

Guide values for housing rupture load and maximum load carrying capacity of connecting screws.
Tightening torques

1. For housings made from spheroidal graphite cast iron GJS-400-15 (suffix D).
2. Maximum load carrying capacity in load direction F, where there is still contact at the parting line between the upper and lower housing sections.

Lubrication

Split plummer block housings SNS are principally intended for grease lubrication. However, a design for oil lubrication is also available by agreement.

Lubricating greases

Arcanol rolling bearing greases

In order to achieve a long operating life and high operational security of the bearing arrangement, we recommend the use of rolling bearing greases Arcanol ➤ section. These have been designed and tested for bearing arrangement engineering.

Grease quantity

Basic rule for initial greasing

For initial greasing, the basic rule is that the bearing should be filled with grease to 100% and the free volume of the housing to 60%. The free volume is the space that remains in the housing once the bearing, adapter sleeve, shaft and seals have been fitted.

Recommended grease quantity

The recommended grease quantity can also be stated in grams once the density of the grease has been taken into consideration ➤ Table.

The recommended grease quantity takes account of:

• filling of the free volume to 60%
• grease with a density of 0,9 g/cm³

Recommended grease quantity for selected housing/ bearing combinations

Housing		Bearing	Adapter sleeve	Free volume (100%)	Recommended grease quantity
				cm3	≈ g
SNS22
	SNS2264-H-D	22264..-K	H3064	27 550	14 900
SNS30
	SNS3036-H-D	23036..-K	H3036	2 900	1 600
	SNS3038-H-D	23038..-K	H3038	3 900	2 250
	SNS3040-H-D	23040..-K	H3040	5 020	3 050
	SNS3044-H-D	23044..-K	H3044	5 770	4 260
	SNS3048-H-D	23048..-K	H3048	7 280	4 550
	SNS3052-H-D	23052..-K	H3052	9 930	6 750
	SNS3056-H-D	23056..-K	H3056	12 500	6 750
	SNS3060-H-D	23060..-K	H3060	14 800	8 000
	SNS3064-H-D	23064..-K	H3064	19 400	10 500
	SNS3068-H-D	23068..-K	H3068	24 000	13 000
	SNS3072-H-D	23072..-K	H3072	30 400	16 450
	SNS3076-H-D	23076..-K	H3076	32 000	17 300
	SNS3080-H-D	23080..-K	H3080	33 500	18 100
	SNS3084-H-D	23084..-K	H3084	35 000	18 900
	SNS3088-H-D	23088..-K	H3088	43 400	23 450
	SNS3092-H-D	23092..-K	H3092	56 600	30 600
	SNS3096-H-D	23096..-K	H3096	55 200	29 850
	SNS30/500-H-D	230/500..-K	H30/500	55 200	29 850
	SNS30/530-H-D	230/530..-K	H30/530	67 500	36 450
continued ▼

Information on the recommended grease quantity for other housing sizes is available by agreement.

Recommended grease quantity for selected housing/ bearing combinations

Housing		Bearing	Adapter sleeve	Free volume (100%)	Recommended grease quantity
				cm3	≈ g
SNS31
	SNS3134-H-D	23134..-K	H3134	2 900	1 600
	SNS3136-H-D	23136..-K	H3136	3 810	2 060
	SNS3138-H-D	23138..-K	H3138	5 030	2 720
	SNS3140-H-D	23140..-K	H3140	6 780	3 660
	SNS3144-H-D	23144..-K	H3144	7 520	4 060
	SNS3148-H-D	23148..-K	H3148	10 100	5 990
	SNS3152-H-D	23152..-K	H3152	11 650	6 300
	SNS3156-H-D	23156..-K	H3156	12 550	6 800
	SNS3160-H-D	23160..-K	H3160	17 200	9 300
	SNS3164-H-D	23164..-K	H3164	21 250	11 500
	SNS3168-H-D	23168..-K	H3168	27 550	14 900
	SNS3172-H-D	23172..-K	H3172	28 500	15 400
	SNS3176-H-D	23176..-K	H3176	28 300	15 300
	SNS3180-H-D	23180..-K	H3180	36 450	19 700
	SNS3184-H-D	23184..-K	H3184	45 550	24 600
	SNS3188-H-D	23188..-K	H3188	48 300	26 100
	SNS3192-H-D	23192..-K	H3192	52 000	28 100
	SNS3196-H-D	23196..-K	H3196	55 000	29 700
SNS32
	SNS3234-H-D	23234..-K	H2334	5 350	2 900
	SNS3236-H-D	23236..-K	H2336	5 350	2 900
	SNS3238-H-D	23238..-K	H2338	6 500	3 510
	SNS3240-H-D	23240..-K	H2340	6 900	3 760
	SNS3244-H-D	23244..-K	H2344	10 000	5 400
	SNS3248-H-D	23248..-K	H2348	10 200	5 550
	SNS3252-H-D	23252..-K	H2352	15 500	8 400
	SNS3256-H-D	23256..-K	H2356	15 500	8 400
	SNS3260-H-D	23260..-K	H3260	19 000	10 300
	SNS3264-H-D	23264..-K	H3264	25 300	13 700
	SNS3268-H-D	23268..-K	H3268	25 000	13 500
	SNS3272-H-D	23272..-K	H3272	26 800	14 500
	SNS3276-H-D	23276..-K	H3276	38 600	20 850
	SNS3280-H-D	23280..-K	H3280	44 100	23 850
	SNS3284-H-D	23284..-K	H3284	45 000	24 350
	SNS3288-H-D	23288..-K	H3288	49 400	26 700
continued ▲

Information on the recommended grease quantity for other housing sizes is available by agreement.

Deviation from basic rule

The recommended degree of filling for the greasing of bearings, as a function of the application and speed, may deviate from 100%.

Relubrication

Bearings with circumferential lubrication groove

Where relubrication is carried out on bearings with a circumferential lubrication groove, the grease is introduced into the housing via the central lubrication hole ➤ Figure. In this type of relubrication, the grease acts directly on the bearing.

Bearings without lubrication groove

For the relubrication of bearings without a lubrication groove, two relubrication points are provided in the upper housing section. One of the two points has a threaded hole, while the other is indicated by a cast-in pilot hole.

Lubrication holes and lubrication nipples

The lubrication holes and lubrication nipples provided for relubrication differ according to the design of the housing ➤ Table. In the case of housings SNS..-H and SNS..-Z, the threaded holes are closed off by a screw plug. This must be removed and permanently replaced by one of the lubrication nipples supplied. In the case of housings SNS..-B, both taper type lubrication nipples are already fitted.

Lubrication holes and lubrication nipples

Housing	Thread	Lubrication nipple	Delivery quantity
SNS..-H SNS..-Z	M10×1	Button head lubrication nipple to DIN 3404-M10×1 (with dust cap)	1
SNS..-H SNS..-Z	M10×1	Taper type lubrication nipple to DIN 71412-AM10×1 (with dust cap)	1
SNS..-B	ISO 288-G1/4	Button head lubrication nipple to DIN 3404-A G1/4 St	2

Positions for further lubrication holes

Lubrication holes can be provided at two further points for relubrication of labyrinth seals. These positions are indicated by marks on the housing.

Prevention of overgreasing

In order to prevent overgreasing, the screw plugs must be removed from the two grease outlet holes in the lower housing section for the duration of relubrication. This allows superfluous grease to escape. The grease outlet holes must then be closed off again using the screw plugs.

If unfavourable environmental conditions are present, there is therefore a risk of contaminant ingress into the housing when the grease outlet holes are opened.

Positions for relubrication Central lubrication hole, for bearings with lubrication groove Points for relubrication of bearings without lubrication groove Points for relubrication of labyrinth seals Grease outlet holes

Sealing

Seals

Standard seals

For sealing of the bearing housings, the following standard seals are available:

• labyrinth seals and Taconite seals, each in a split and unsplit design. These seals are matched to the rectangular section annular slots on both sides of the housings SNS..-H and SNS..-Z
• Bold-on seal. This seal is screw mounted to the outside of housings SNS..-B.

Seals must be ordered separately. They are supplied individually. If a continuous shaft is present, two seals are necessary.

Labyrinth seals NTS

Non-contact seal for high circumferential velocities

Labyrinth seals NTS give non-contact sealing. They are therefore suitable for high circumferential velocities. The O ring, which is pressed between the labyrinth ring and shaft, is made from fluoro rubber FKM and is suitable for temperatures of up to +200 °C. The labyrinth seal allows shaft misalignment of up to 0,3° in both directions and is suitable for grease lubrication.

Relubrication

If necessary, the labyrinth can be relubricated. For this purpose, a lubri­cation hole must be made in the upper housing section for each labyrinth seal. The optimum positions are indicated by cast-in pilot holes.

Taconite seals NTC

Seals for extreme contamination impact

Taconite seals NTC are combined seals comprising a labyrinth seal and a V ring. These seals are suitable for extreme operating conditions in relation to contamination and dust. The V ring is made from NBR and is suitable for temperatures of up to +100 °C.

The Taconite seal allows shaft misalignment of up to 0,3° in both directions and is suitable for grease lubrication. For relubrication, the seal is fitted with a lubrication nipple.

Split labyrinth seals NTSG

Split seal reduces mounting work

For plummer block housings SNS, labyrinth seals are also available in a split design. As a result, the work involved in fitting or replacing the seal can be considerably reduced, especially if a split bearing is also fitted.

The characteristics and operating limits correspond to those of the unsplit labyrinth seal NTS.

Split labyrinth seals NTSG are available in various sizes ➤ Table. Other sizes are available by agreement.

Sizes

Sizes of split labyrinth seals for
Metric shaft	Inch size shaft
NTSG34	NTSG34×515
NTSG36	NTSG36×607
NTSG38	‒
NTSG40	‒
NTSG44	‒
NTSG48	‒
NTSG52	‒

Split Taconite seals NTCG

Split seal reduces mounting work

For plummer block housings SNS, Taconite seals are also available in a split design. As a result, the work involved in fitting or replacing the seal can be considerably reduced, especially if a split bearing is also fitted.

Split Taconite seals are supplied by agreement.

Bold-on seals BTAC

Seal for extreme contamination impact

Bold-on seals BTAC are combined seals comprising a labyrinth ring and a V ring. They are screw mounted to the outside of the housing and, unlike all other seals for plummer block housings SNS, are not inserted in the annular slots in the housing. The seals are suitable for extreme operating conditions in relation to contamination and dust. The V ring is made from NBR and is suitable for temperatures of up to +100 °C.

The Bold-on seal allows shaft misalignment of up to 0,4° in both directions and is suitable for grease lubrication. For relubrication, the seal is fitted with a lubrication nipple.

The seals are available in the sizes BTAC34 to BTAC68.

Special housing design required

When using Bold-on seals, housings of a special design SNS..-B are required instead of the designs SNS..-H and SNS..-Z suitable for all other seals.

Covers

Covers are used in the case of housings closed on one side. The covers must be ordered separately.

Covers NDK

For housings with annular slot

Covers NDK fit in the rectangular section annular slots of the housings, designed for labyrinth and Taconite seals, SNS..-H and SNS..-Z. They are suitable for temperatures up to +200 °C.

Covers BDK

For housings with Bolt-on seal

Covers BDK are screw mounted to the outside of the housing. They are suitable for the housings SNS..-B designed for the Bolt-on seal.

Characteristics and operating limits

The characteristics and operating limits of the standard seals and covers are compared in an overview ➤ Table.

Standard seals and covers for plummer block housings SNS

1. The envelope requirement Ⓔ applies

Dimensions, tolerances

Dimensions

The dimensions of the housings conform to ISO 113.

Interchangeability

FAG plummer block housings SNS are a further development of the FAG plummer block housings SD31. The design envelope and mounting dimensions of both series of housings are identical and the housings are interchangeable 1:1.

The interchangeability with other series of FAG housings is as follows:

• All bearing series that can be combined with the plummer block housings SD5 and SD6 can be fitted in plummer block housings SNS
• Bearing series that can be combined with the plummer block housings S30 can only be fitted in certain cases in plummer block housings SNS

The dimensions of housings SD5, SD6 and S30 are not identical with the dimensions of housings SNS.

Tolerances for the bearing seat

The bearing seat in split plummer block housings SNS is machined to the tolerance class G7 in accordance with DIN EN ISO 286-1.

By agreement, the housings can also be supplied with other tolerance classes for the bearing seat.

Housing configurations

Possible combinations

Modular construction allows numerous combinations

On the basis of the standard components, the following features can be varied in the housing configuration:

• location of bearings with a tapered bore by means of an adapter sleeve on a shaft of constant diameter or of bearings with a cylindrical bore directly on a stepped shaft
• sealing of housing by labyrinth seals (unsplit or split), Taconite seals (unsplit or split) or Bold-on seals (in combination with housings of design SNS..-B)
• with a continuous shaft or a housing closed on one side
• design of the bearing arrangement as a locating bearing arrangement or a non-locating bearing arrangement
• spherical roller bearing in a split or unsplit design

The resulting possible housing configurations make it possible to fulfil various requirements on the bearing positions by means of standard components ➤ Figure to ➤ Figure.

Plummer block housing SNS for bearings with tapered bore and adapter sleeve (2 labyrinth seals NTS) Locating bearing Non-locating bearing

Plummer block housing SNS for bearings with tapered bore and adapter sleeve (labyrinth seal NTS and cover NDK) Locating bearing Non-locating bearing

Plummer block housing SNS for bearings with tapered bore and adapter sleeve (2 Taconite seals NTC) Locating bearing Non-locating bearing

Plummer block housing SNS for bearings with tapered bore and adapter sleeve (Taconite seal NTC and cover NDK) Locating bearing Non-locating bearing

Plummer block housing SNS for bearings with cylindrical bore (2 labyrinth seals NTS) Locating bearing Non-locating bearing

Plummer block housing SNS for bearings with cylindrical bore (labyrinth seal NTS and cover NDK) Locating bearing Non-locating bearing

Plummer block housing SNS for bearings with cylindrical bore (2 Taconite seals NTC) Locating bearing Non-locating bearing

Plummer block housing SNS for bearings with cylindrical bore (Taconite seal NTC and cover NDK) Locating bearing Non-locating bearing

Plummer block housing SNS for bearings with tapered bore and adapter sleeve (2 Bold-on seals BTAC) Locating bearing Non-locating bearing

Plummer block housing SNS for bearings with tapered bore and adapter sleeve (Bold-on seal BTAC and cover BDK) Locating bearing Non-locating bearing

Mounting of split spherical roller bearings

Simplified bearing replacement by means of split bearing

In the case of plummer block housings SNS, an unsplit spherical roller bearing with a tapered bore and adapter sleeve can be replaced by a split spherical roller bearing ➤ Figure.

Plummer block housing SNS with split and unsplit spherical roller bearing Locating bearing with unsplit bearing Non-locating bearing with unsplit bearing Locating bearing with split bearing Non-locating bearing with split bearing

In order to ensure selection of the correct combination of housing and bearing when using split bearings, please contact Schaeffler.

The range of split spherical roller bearings is described in detail in a separate publication TPI 250.

Structure of housing designation

The designation of the housings and associated seals, covers and locating rings follows a set model. Description of the designation components ➤ Table to ➤ Table. Structure of designations ➤ Figure to ➤ Figure.

Components of the designations of plummer block housings SNS

Characteristic		Code	Description
	Series
		SNS	Split plummer block housings SNS
	ISO dimension series of bearing
		30	ISO dimension series 22, 23, 30 and 40
		31	ISO dimension series 22, 23 and 31
		32	ISO dimension series 22 and 32
		40	ISO dimension series 40
	Housing size
		36 /530	For bearings of ISO dimension series 30, 31 and 32: Bore code of bearing
	Housing design
		H	Main design ➤ Table
		Z	Additional design ➤ Table
		B	Design for Bold-on s
	Housing material
		D	Spheroidal graphite cast iron

Designation structure of plummer block housings SNS, example

Plummer block housings SNS with labyrinth and Taconite seals are available in the housing designs H and Z. Spherical roller bearings can be fitted, as a function of the bearing series, in one of the two housing designs ➤ Table.

Allocation of housing designs H and Z to bearing types

Housing design	Bearing series
H
	Spherical roller bearings with tapered bore and adapter sleeve
	Split spherical roller bearings
	Following spherical roller bearings with cylindrical bore: 22232, 22234, 22252, 22272, 22326, 22328, 22330, 22332, 22334, 22338, 22344, 22348, 22352, 22356, 23232, 24036
Z
	Spherical roller bearings with cylindrical bore, not allocated to housing design H

Components of the designations of standard seals

Characteristic		Code	Description
	Series
		NTS	Labyrinth seal, unsplit
		NTC	Taconite seal, unsplit
		NTSG	Taconite seal, unsplit
		BTAC	Bold-on seal, unsplit
	Dimension series
		36	Dimension series 36
	Shaft diameter
		No further indications	Standard shaft diameter of dimension series
		/125	Metric shaft diameter: 125 mm
		X415	Inch size shaft diameter: 4 inch + 15 · 1/16 inch = 4 15/16 inch

Designation structure of standard seals, examples

Components of designations of covers

Characteristic		Code	Description
	Series
		NDK	Cover for plummer block housings SNS..-H and SNS..-Z
		BDK	Cover for plummer block housing SNS..-B
	Dimension series
		36	Dimension series 36

Designation structure of covers, example

Components of designations of locating rings

Characteristic		Code	Description
	Series
		NFR	Locating ring
	Outside diameter
		280	Outside diameter 280 mm
	Width
		10	Width 10 mm

Designation structure of locating rings, example

Ordering examples

Separate ordering of housing body and accessories

When a split plummer block housing SNS is ordered, the housing designation only describes the housing body. The other components such as seals, covers or locating rings must be ordered separately in the specific design required. The rolling bearing and, if necessary, the adapter sleeve must also be ordered separately.

Plummer block housings SNS with a bearing fitted give non-locating bearing arrangements. These can be converted into locating bearing arrangements through the additional insertion of locating rings NFR.

The ordering examples show the construction of orders for selected housing combinations and the appropriate bearings. The allocation of housings, bearings and accessories for all housing sizes is shown in the product tables ➤ link.

Example 1

Plummer block housing SNS made from spheroidal graphite cast iron, closed on one side, spherical roller bearing 23136-E1A-K-M as locating bearing, location by means of adapter sleeve on shaft diameter of 160 mm, labyrinth seal.

Order

1 plummer block housing	SNS3136-H-D
1 spherical roller bearing	23136-E1A-K-M
1 adapter sleeve	H3136-HG
2 locating rings	NFR300/10
1 cover	NDK36
1 labyrinth seal	NTS36

Example 2

Plummer block housing SNS made from spheroidal graphite cast iron, continuous shaft, spherical roller bearing 23136-E1A-K-M as non-locating bearing, location by means of adapter sleeve on shaft diameter of 160 mm, Taconite seal.

Order

1 plummer block housing	SNS3136-H-D
1 spherical roller bearing	23136-E1A-K-M
1 adapter sleeve	H3136-HG
2 Taconite seals	NTC36

Example 3

Plummer block housing SNS made from spheroidal graphite cast iron, closed on one side, spherical roller bearing 23136-E1A-K-M as non-locating bearing, location by means of adapter sleeve on shaft diameter of 160 mm, Bold-on seal.

Order

1 plummer block housing	SNS3136-B-D
1 spherical roller bearing	23136-E1A-K-M
1 adapter sleeve	H3136-HG
1 cover	BDK36
1 Bolt-on seal	BTAC36

Mounting and dismounting

Eye bolts

The upper housing section has 2 eye bolts in accordance with DIN 580. These are intended as locating points for mounting and dismounting of the housing. The load carrying capacity of the eye bolts allows lifting of the housing including a bearing fitted in the housing.

Eye bolts must always be screwed fully into the housing.

Eye bolts must not be subjected to a mass greater than that of the housing together with the bearing fitted in the housing.

Foot screws

Foot screws are used for screw mounting of the housing to the mounting surface. They are not included in the scope of delivery of the housings.

The appropriate screw size for each housing is given in the product tables ➤ link.

Tightening torques for foot screws

The following table contains tightening torques for metric coarse pitch threads in accordance with DIN 13, DIN 962 and DIN ISO 965-2.

The maximum tightening torques are valid when utilising 90% of the yield stress of the screw material 8.8 and with a friction factor of 0,14. We recommend that foot screws should be tightened to approx. 70% of these values ➤ Table.

Tightening torques for foot screws with metric thread in accordance with DIN 13, DIN 962 and DIN ISO 965-2

Nominal screw diameter	Maximum tightening torque	Recommended tightening torque
	Nm	Nm
M24	798	550
M30	1 597	1 100
M36	2 778	1 950
M42	3 991	2 750
M48	6 021	4 250

Permissible shaft end designs

No contact between shaft and cover

In the case of a housing closed on one side, the length of the shaft in the housing must be restricted such that no contact occurs between the shaft and the cover. In this case, the displacement facility of the bearing in a non-locating bearing arrangement must be taken into consideration. The basis for determining the permissible length of the shaft is the spacing between the centre of the bearing seat and the cover ➤ Figure and ➤ Table.

Spacing between centre of bearing seat and cover ad = spacing between centre of bearing seat and cover

Spacing between centre of bearing seat and cover

Housing					Spacing
SNS22	SNS30	SNS31	SNS32	SNS40	ad
					mm
‒	SNS3036	SNS3134	‒	‒	107,5
‒	SNS3038	SNS3136	‒	‒	113,5
‒	SNS3040	SNS3138	SNS3234	‒	117,5
‒	‒	‒	SNS3236	‒	117,5
‒	SNS3044	SNS3140	SNS3238	‒	127,5
‒	SNS3048	SNS3144	SNS3240	‒	133,5
‒	SNS3052	SNS3148	SNS3244	‒	141,5
‒	SNS3056	SNS3152	SNS3248	‒	151,5
‒	SNS3060	SNS3156	‒	‒	154,5
‒	SNS3064	SNS3160	SNS3252	‒	175,5
‒	‒	‒	SNS3256	‒	175,5
‒	SNS3068	SNS3164	SNS3260	‒	186,5
‒	SNS3072	‒	‒	‒	186,5
SNS2264	SNS3076	SNS3168	SNS3264	SNS4076	202,5
‒	SNS3080	SNS3172	SNS3268	SNS4080	208,5
‒	SNS3084	SNS3176	‒	SNS4084	208,5
‒	SNS3088	SNS3180	SNS3272	SNS4088	223,5
‒	SNS3092	SNS3184	SNS3276	SNS4092	243,5
‒	SNS3096	SNS3188	SNS3280	SNS4096	243,5
‒	SNS30/500	‒	‒	SNS40/500	243,5
‒	SNS30/530	SNS3192	SNS3284	SNS40/530	248,5
‒	‒	SNS3196	SNS3288	‒	248,5

Detailed information on mounting

Careful and correct mounting of the bearing housing, including the correct mounting of the rolling bearing in the housing, is fundamental to reliable operation. Detailed information is given in the publication MON 84 http://www.schaeffler.de/std/1B6B.

Legal notice regarding data freshness

The further development of products may also result in technical changes to catalogue products

Of central interest to Schaeffler is the further development and optimisation of its products and the satisfaction of its customers. In order that you, as the customer, can keep yourself optimally informed about the progress that is being made here and with regard to the current technical status of the products, we publish any product changes which differ from the printed version in our electronic product catalogue.

We therefore reserve the right to make changes to the data and illus­trations in this catalogue. This catalogue reflects the status at the time of printing. More recent publications released by us (as printed or digital media) will automatically precede this catalogue if they involve the same subject. Therefore, please always use our electronic product catalogue to check whether more up-to-date information or modification notices exist for your desired product.

Further information

In addition to the data in this chapter, the following chapters must also be observed in the selection of a housing:

• Lubrication ➤ section

Further information:

• Product tables on split plummer block housings SNS for inch size shaft diameters GK 1
• Product tables on split plummer block housings SNS in combination with Bold-on seals GK 1
• Electronic housing selection wizard http://www.schaeffler.de/std/1B6A