Bearing housings

Split plummer block housings SNV

Split plummer block housings SNV:

• 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 20 mm to 160 mm ➤ section
• can be combined with an extensive range of seals covering a wide range of requirements and temperatures ➤ Figure and ➤ section

Seals for split plummer block housings SNV T = permissible long term temperature of seal

Housing design

Housings for wide range of applications

Split plummer block housings SNV and the associated bearings form bearing arrangement units that can be matched, through the appropriate selection of accessories, to a wide range of applications ➤ Figure. Applications include agricultural machinery, the paper processing industry, mining, materials processing, the steel industry and power stations.

Split plummer block housing SNV Housings SNV052 to SNV200 are supplied without an eye bolt, housings SNV215 to SNV340 are supplied with an eye bolt

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.

Suitable bearings

Shaft diameters from 20 mm to 160 mm and from 3/4 inch to 5 1/2 inch

Split plummer block housings SNV are intended for fitting with spherical roller bearings, toroidal roller bearings, self-aligning ball bearings and barrel roller bearings with a tapered or cylindrical bore as well as deep groove ball bearings ➤ Table. The range of shaft diameters is 20 mm to 160 mm and 3/4 inch to 5 1/2 inch.

Bearing types and sizes

Bearing type	Size
Spherical roller bearings
with tapered bore and adapter sleeve	21307..-K to 21322..-K
with tapered bore and adapter sleeve	22205..-K to 22232..-K
with tapered bore and adapter sleeve	22308..-K to 22332..-K
with tapered bore and adapter sleeve	23218..-K to 23232..-K
with cylindrical bore	21304 to 21322
with cylindrical bore	22205 to 22232
with cylindrical bore	22308 to 22332
with cylindrical bore	23218 to 23232
Toroidal roller bearings
with tapered bore and adapter sleeve	C2212..-K to C2232..-K
with tapered bore and adapter sleeve	C2312..-K to C2332..-K
with tapered bore and adapter sleeve	C3218..-K to C3232..-K
with cylindrical bore	C2212 to C2232
with cylindrical bore	C2312 to C2332
with cylindrical bore	C3218 to C3232
continued ▼

Bearing types and sizes

Bearing type	Size
Self-aligning ball bearings
with tapered bore and adapter sleeve	1205-K to 1222-K
with tapered bore and adapter sleeve	1305-K to 1320-K
with tapered bore and adapter sleeve	2205-K to 2220-K
with tapered bore and adapter sleeve	2305-K to 2320-K
with cylindrical bore	1205 to 1222
with cylindrical bore	1305 to 1320
with cylindrical bore	2205 to 2220
with cylindrical bore	2304 to 2320
Barrel roller bearings
with tapered bore and adapter sleeve	20205-K to 20232-K
with tapered bore and adapter sleeve	20305-K to 20332-K
with cylindrical bore	20205 to 20232
with cylindrical bore	20305 to 20330
Deep groove ball bearings
with cylindrical bore	6205 to 6232
with cylindrical bore	6304 to 6332
continued ▲

Split spherical roller bearings

Unsplit spherical roller bearings with an adapter sleeve can be replaced by split spherical roller bearings. 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.

Materials, corrosion protection

Materials

The standard material for the housing bodies is flake graphite cast iron EN‑GJL-HB215 in accordance with DIN EN 1561 (suffix L). By agreement, housing bodies made from spheroidal graphite cast iron EN-GJS-400-15 in accordance with DIN EN 1563 (suffix D) are available.

Corrosion protection

All outer surfaces not machined by chip-forming methods have a universal paint coating (colour RAL 7031, blue 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 in the housing and can thus function as non-locating bearings. Locating bearing arrangements can be achieved by the insertion of one locating ring FRM on each side of the bearing outer ring. The bearing is thus seated in the centre of the housing. Locating rings must be ordered separately.

Load carrying capacity

Guide values

Guide values are given for the rupture load of plummer block housings SNV 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 for housing rupture load are valid for the standard housing material flake graphite cast iron (suffix L). For spheroidal graphite cast iron (suffix D) a factor of 1,6 should be applied.

The guide values only apply if the flatness of the mounting surface in accordance with DIN EN ISO 1101 corresponds to the tolerance grade IT8 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:

• safety factor of 6 relative to the housing rupture load
• safety factor of 3 relative to the maximum load carrying capacity of the connecting screws

The housing must not be subjected to an axial load of more than 2/3 of the housing rupture load F_180°.

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 or dowels.

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

Housings made from spheroidal graphite cast iron (suffix D) have a housing rupture load that is 1,6 times higher than that of housings made from flake graphite cast iron.

Lubrication

Grease lubrication

Split plummer block housings SNV are principally intended for grease lubrication. The housings can, however, also be supplied in a design for oil lubrication.

Lubricating greases

Suitable greases

Arcanol MULTITOP, a lithium soap grease of NLGI class 2 with particularly effective EP additives, is highly suitable under the following conditions:

• bearing operating temperatures ＜ +100 °C
• bearing loads P/C ＜ 0,3
• bearing-specific speed parameter k_f · n · d_M ＜ 700  000 min^–1 · mm where: k_f = 1 for self-aligning ball bearings and deep groove ball bearings, k_f = 8 to 10,5 for spherical roller bearings

Due to their favourable flow behaviour, greases of NLGI grade 2, such as Arcanol MULTITOP and Arcanol MULTI2, are more suitable for relubrication than greases of higher consistency grades.

Grease quantities

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%. This is the basis for the recommended grease quantities ➤ Table. The free volume is the space that remains in the housing once the bearing, adapter sleeve, shaft and seals have been fitted.

Relubrication

For relubrication, minimum quantities of grease are recommended ➤ Table.

Recommended grease quantities for initial greasing and relubrication

Housing	Grease quantity
	Initial greasing	Relubrication (minimum quantity)
	≈ g	≈ g
SNV052-F	30	5
SNV062-F	45	5
SNV072-F	65	10
SNV080-F	80	10
SNV085-F	105	10
SNV090-F	130	10
SNV100-F	180	15
SNV110-F	210	15
SNV120-F	270	20
SNV125-F	290	20
SNV130-F	330	20
SNV140-F	440	25
SNV150-F	500	30
SNV160-F	650	40
SNV170-F	700	45
SNV180-F	900	55
SNV190-F	950	60
SNV200-F	1 200	70
SNV215-F	1 400	80
SNV230-F	1 600	85
SNV240-F	1 700	90
SNV250-F	2 000	100
SNV260-F	2 000	120
SNV270-F	2 500	130
continued ▼

Recommended grease quantities for initial greasing and relubrication

Housing	Grease quantity
	Initial greasing	Relubrication (minimum quantity)
	≈ g	≈ g
SNV280-F	2 600	140
SNV290-F	3 000	150
SNV300-F	3 100	160
SNV320-F	3 700	200
SNV340-F	4 500	240
continued ▲

Special case with 100% grease filling

With a speed parameter n · d_M ＜ 50  000 min^–1 · mm and a non-contact seal (labyrinth seal TSV), where the grease should also perform a sealing function, the housing and seal cavities should be filled to 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 raceway.

Bearings without lubrication groove

Where relubrication is carried out on bearings without a lubrication groove, the grease must be introduced into the housing via the lateral lubrication hole. In this case, the housing cavities on the side with the lubrication nipple must be filled completely with grease so that the relubrication grease can act immediately on the bearing.

Permanent use of lubrication nipples

In both cases, the lubrication hole present (threaded hole M10×1) is prepared by removing the screw plug and permanently inserting one of the lubrication nipples supplied at this point.

Marked positions for further lubrication holes

As an alternative to the lubrication holes already present, lubrication holes may be introduced at other positions as indicated by the cast-in marking points.

Lubrication holes can be introduced at further marked positions for the relubrication of labyrinth seals.

Prevention of overgreasing

For relubrication, minimum quantities of grease are recommended ➤ Table. In order to prevent overgreasing, the screw plug in the grease outlet hole in the lower housing section must be removed while relubrication is being carried out. This allows superfluous grease to escape. This must be observed in particular when using double lip seals DH. Otherwise, there is a risk that the double lip seal will be pressed out of the housing.

The grease outlet hole must then be closed off again using the screw plug.

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 SNV052-F to SNV200-F SNV215-F to SNV340-F Central lubrication hole, for bearings with lubrication groove Lateral lubrication hole, for bearings without lubrication groove Marked positions for further lubrication holes for lubrication of the bearing Marked positions for further lubrication holes for lubrication of seals Grease outlet hole

Standard parts and dimensions

Screw plugs

The lubrication and grease outlet holes are closed off using screw plugs to DIN 906.

Lubrication nipples

Lubrication nipples with a dust cap are supplied as followed:

• button head lubrication nipples to DIN 3404-M10×1
• taper type lubrication nipple to DIN 71412-AM10×1

Dimensions

The size of the grease outlet hole is dependent on the size of the housing ➤ Table.

Dimensions of threaded holes

Housing	Thread for
	Grease outlet hole	Relubrication hole
SNV052-F – SNV090-F	M10×1	M10×1
SNV100-F – SNV125-F	M14×1,5	M10×1
SNV130-F – SNV340-F	M20×1,5	M10×1

Oil lubrication

Suitability for oil bath and recirculating oil lubrication

Split plummer block housings SNV are suitable not only for grease lubrication but also for oil bath lubrication and recirculating oil lubrication. The housings have a large internal cavity with oil collector pockets in the lower section. Due to the housing geometry, it is possible to introduce connection holes for oil inlet, oil outlet, an oil sight glass and a temperature sensor.

Connection holes for oil lubrication

Dimensions

The recommended dimensions are valid for oil bath lubrication and for recirculating oil lubrication ➤ Table, ➤ Table and ➤ Figure.

Utilisation

If recirculating oil lubrication is used, the hole M₂ is intended for the oil inlet function. If oil bath lubrication is used, a venting device can be installed for venting of the housing.

If oil bath lubrication is used, the hole M₄ is intended for the oil sight glass. If recirculating oil lubrication is used, the hole can be used for the oil outlet.

Recommended dimensions of connnection holes for oil inlet and oil outlet

Housing	Connection for
	Oil inlet		Oil outlet
	M2	n3/2	M3	α	g6
		mm		°	mm
SNV100-F	G1/4	31	M10×1	50	44
SNV110-F	G1/4	33,5	M10×1	50	46
SNV120-F	G1/4	35,5	M10×1	50	49
SNV125-F	G1/4	28,5	M10×1	50	49
SNV130-F	G1/4	38	M10×1	50	51,5
SNV140-F	G1/4	40,5	M10×1	60	57,5
SNV150-F	G1/4	42,5	M10×1	60	60
SNV160-F	G1/4	45	M10×1	60	62,5
SNV170-F	G1/4	46,5	M10×1	60	64
SNV180-F	G1/4	19,5	M10×1	60	69
SNV190-F	G1/4	49,5	M10×1	60	68,5
SNV200-F	G1/4	55,5	M10×1	60	77,5
SNV215-F	G1/4	58,5	M10×1	60	80
SNV230-F	G1/4	61	M10×1	60	83
SNV240-F	G1/4	60	M10×1	60	81,5
SNV250-F	G1/4	65,5	M10×1	60	89
SNV260-F	G1/4	62,5	M10×1	60	84
SNV270-F	G1/4	71,5	M10×1	60	86,5
SNV280-F	G1/4	68	M10×1	60	92,5
SNV290-F	G1/4	76	M10×1	60	102,5
SNV300-F	G1/4	73	M10×1	60	99,5
SNV320-F	G1/4	77	M10×1	60	105,5
SNV340-F	G1/4	81	M10×1	60	109,5

Recommended dimensions of connection holes for oil sight glass

Housing	Connection for oil sight glass
	M4	g7	h3	D5
		mm
SNV100-F	G3/8	33	31	24
SNV110-F	G3/8	35	28	24
SNV120-F	G3/8	38	35	24
SNV125-F	G3/8	44	24	24
SNV130-F	G1/2	43	28,5	30
SNV140-F	G1/2	45	40	30
SNV150-F	G1/2	47	38	30
SNV160-F	G1/2	50	39	30
SNV170-F	G3/4	55	46	36
SNV180-F	G3/4	57	43	36
SNV190-F	G3/4	48	45	36
SNV200-F	G3/4	62	50	36
SNV215-F	G3/4	67	58	36
SNV230-F	G3/4	70	60	36
SNV240-F	G3/4	61	60	36
SNV250-F	G3/4	75	55	36
SNV260-F	G3/4	65	65	36
SNV270-F	G3/4	81	55	36
SNV280-F	G3/4	70	60	36
SNV290-F	G3/4	87	58	36
SNV300-F	G3/4	75	70	36
SNV320-F	G3/4	80	73	36
SNV340-F	G3/4	95	75	36

Dimensions of connection holes Venting device Screw plug Oil sight glass

Design for oil lubrication

Housings with connection holes for oil lubrication

Plummer block housings SNV can be supplied by agreement in a design for oil lubrication. Housings of this design already have the connection holes for oil inlet, oil outlet and an oil sight glass to the recommended dimensions ➤ Table, ➤ Table and ➤ Figure.

The scope of delivery of the design for oil lubrication includes:

• 1 oil sight glass OSGL
• 1 venting device VENT
• 2 screw plugs VSB

Housings with connection holes according to individual customer specifications can also be supplied once their feasibility has been checked.

Sealing

Sealing of the shaft

When using the double lip seal DH, a certain amount of oil leakage must be expected, which is unavoidable with seals that are split and not spring‑loaded.

In order to limit oil leakage to a small quantity, the shaft in the seal area should have the following characteristics:

• hardness at least 55 HRC
• ground without spiral marks to Ra = 0,2 mm, but at least Ra ≦ 0,5 μm

A technically oiltight design is only possible with a spring-loaded, unsplit rotary shaft seal.

Sealing of the housing body

The parting line between the upper and lower housing sections must be sealed with a thin layer of a commercial sealant (with permanent elasticity). In the case of a housing closed on one side, the base of the groove in which the cover is inserted must be brushed with sealant.

Guidelines for oil bath lubrication

Minimum oil level

When using oil bath lubrication, a minimum oil level must be ensured. This corresponds to the dimension h3 ➤ Table and ➤ Figure.

Housing venting

When using oil bath lubrication, venting of the housing is absolutely necessary.

For operation with oil bath lubrication, venting of the housing must be provided. For example, the filling hole can be closed off using a bleed screw.

Sealing

Seals

Standard seals

For the sealing of the bearing housings, the standard seals available are the double lip seal, the felt seal, the labyrinth seal, the V ring seal and the Taconite seal. These seals are matched to the rectangular section annular slots on both sides of the housings. They are principally suitable for grease lubrication. The seals must be ordered separately. In the case of the double lip seal and felt seal, the scope of delivery comprises two seals, while all other seals are supplied individually. If a continuous shaft is present, two seals must be ordered.

Special seals

Special seals are also available by agreement.

Double lip seal DH

Separate sealing functions inwards and outwards

The seal lips of the double lip seal DH slide on the rotating shaft. The outer seal lip prevents ingress of contamination into the bearing. This effect is supported by the grease inserted between the seal lips. The inner lip prevents lubricant from escaping from the housing. The seal is made from acrylonitrile butadiene rubber NBR and is suitable for circumferential velocities of up to 13 m/s. For continuous operation, a maximum circumferential velocity of 6 m/s is recommended.

The seal is suitable for temperatures from –40 °C to +100 °C. It allows shaft misalignment of up to 0,5° in both directions.

Two-piece seal for simplified fitting

The double lip seal DH is a two-piece seal. It can be easily inserted in the annular slots in the housing. The parting joint of the seal halves should be in the same plane as the parting joint of the housing.

Shaft

The contact running area on the shaft for the seal lips should have a roughness Ra 3,2.

Felt seals FSV

Robust seal for grease lubrication

Felt seals FSV are particularly suitable for grease lubrication. They comprise an adapter holding the inserted, oil-impregnated felt strip and the adapter is secured against rotation by an O ring in the annular slot in the housing. The seals are suitable for circumferential velocities of up to 5 m/s and, after running-in, of up to 15 m/s. They can be used at temperatures up to +100 °C. The permissible shaft misalignment is 0,5° in both directions.

Aramide packing

By agreement, aramide packing is available for temperatures of more than 100 °C.

Labyrinth seals TSV

Non-contact seal for high circumferential velocities

Labyrinth seals TSV 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 0,5° in both directions.

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.

V ring seals DHV

Seal in axial contact

In the case of V ring seals DHV, the seal lip is in axial contact with the sliding surface which is located in the rectangular section annular slot of the housing. The seal is made from NBR and is suitable, when using grease lubrication, for circumferential velocities of up to 12 m/s. If circumferential velocities of more than 8 m/s are present, axial location is necessary. The seal allows shaft misalignment of up to 0,5° in both directions.

Taconite seals TCV

Seal for extreme contamination impact

Taconite seals TCV 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 0,5° in both directions.

Covers

Covers are used in the case of housings closed on one side. The covers fit in the rectangular section annular slots in the housings.

Covers DKV

Covers made from plastic

Covers DKVT

Covers made from metal

Covers DKVT are made from steel, flake graphite cast iron or spheroidal graphite cast iron and are suitable for temperatures of up to +200 °C. Covers are available by agreement.

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 SNV

1. The envelope requirement Ⓔ applies.

Dimensions, tolerances

Dimensions

The dimensions of housings SNV correspond to ISO 113 and DIN 736 to DIN 739.

Interchangeability

The housings SNV are interchangeable with the existing housings SN and SNE.

Tolerances for the bearing seat

The bearing seat in split plummer block housings SNV is machined to the tolerance class G7 in accordance with DIN EN ISO 286-1. The tolerance indicated is valid in the delivered condition, i. e. before the screws connecting the upper and lower sections are loosened.

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 ➤ Figure and ➤ Figure:

• 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 double lip seal, felt seal, labyrinth seal, V ring seal or Taconite seal
• continuous shaft or a housing closed on one side
• cover made from plastic (DKV) or cover made from steel or cast iron (DKVT)
• design of the bearing arrangement as a locating bearing arrangement or a non-locating bearing arrangement
• spherical roller bearing of split or unsplit design

Plummer block housing SNV for bearings with tapered bore and adapter sleeve (overview of combinations) Locating bearing Non-locating bearing Labyrinth seal TSV Cover DKV Cover DKVT Taconite seal TCV Double lip seal DH V ring seal DHV Felt seal FSV

Plummer block housing SNV for bearings with cylindrical bore (overview of combinations) Locating bearing Non-locating bearing Labyrinth seal TSV Cover DKV Cover DKVT Taconite seal TCV Double lip seal DH V ring seal DHV Felt seal FSV

Mounting of split spherical roller bearings

Simplified bearing replacement by means of split bearing

In the case of plummer block housings SNV, 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 SNV 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 SNV

Characteristic		Code	Description
	Series	SNV	Split plummer block housings SNV
	Bearing outside diameter	340	Outside diameter 340 mm
	Housing design	F	Threaded holes for grease relubrication and grease outlet
	Housing material	L	Flake graphite cast iron (standard)
		D	Spheroidal graphite cast iron

Structure of designations of plummer block housings SNV, example

Components of the designations of standard seals

Characteristic		Code	Description
	Series
		DH	Double lip seal, split
		FSV	Felt seal, split
		TSV	Labyrinth seal, unsplit
		DHV	V ring seal, unsplit
		TCV	Taconite seal, unsplit
	Diameter series of bearing, bearing bore
		2	Bearings of diameter series 2, cylindrical bearing bore
		3	Bearings of diameter series 3, cylindrical bearing bore
		5	Bearings of diameter series 2, tapered bearing bore and adapter sleeve
		6	Bearings of diameter series 3, tapered bearing bore and adapter sleeve
	Bore code of bearing
		08	Bore diameter (8 · 5) mm = 40 mm
	Shaft diameter
		No further indications	Standard shaft diameter of dimension series
		X105	Inch size shaft diameter: 1 inch + 5 · 1/16 inch = 1 5/16 inch

Structure of designations of standard seals, examples

Components of designations of covers

Characteristic		Code	Description
	Series
		DKV	Cover made from plastic
		DKVT	Cover made from steel and FKM
	Housing size
		080	Cover suitable for housing SNV080

Designation structure of covers, examples

Components of designations of locating rings

Characteristic		Code	Description
	Series
		FRM	Locating ring
	Outside diameter
		80	Outside diameter 80 mm
	Width
		10,5	Width 10,5 mm

Designation structure of locating rings, example

Ordering examples

Separate ordering of housing body and accessories

When a split plummer block housing SNV 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 SNV with a bearing fitted give non-locating bearing arrangements. These can be converted into locating bearing arrangements through the additional insertion of locating rings FRM.

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 SNV made from flake graphite cast iron, closed on one side, self-aligning ball bearing 2210-K-TVH-C3 as locating bearing, location by means of an adapter sleeve on shaft diameter of 45 mm, double lip seal.

Order

1 plummer block housing	SNV090-F-L
1 self-aligning ball bearing	2210-K-TVH-C3
1 adapter sleeve	H310
2 locating rings	FRM90/9
1 cover	DKV090
1 double lip seal	DH510 (2 pieces per pack)

Example 2

Plummer block housing SNV made from flake graphite cast iron, for continuous shaft, split spherical roller bearing 222SM70-TVPA as locating bearing, double lip seal.

Order

1 plummer block housing	SNV140-F-L
1 split spherical roller bearing	222SM70-TVPA
2 locating rings	FRM140/12,5
2 double lip seals	DH516 (2 pieces per pack)

Example 3

Plummer block housing SNV made from spheroidal graphite cast iron, closed on one side, spherical roller bearing 23218-E1-TVPB as non‑locating bearing, felt seal.

Order

1 plummer block housing	SNV160-F-D
1 spherical roller bearing	23218-E1-TVPB
1 shaft nut	KM18
1 tab washer	MB18
1 cover	DKV160
1 felt seal	FSV218 (2 pieces per pack)

Mounting and dismounting

Eye bolts

In the case of housing size SNV215 and larger, the upper housing section has an eye bolt in accordance with DIN 580. This is intended as a locating point for mounting and dismounting of the housing. The load carrying capacity of the eye bolt allows lifting of the housing including a bearing fitted in the housing.

The eye bolt must always be screwed fully into the housing.

The eye bolt 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 tightening torques are maximum values 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
M12	93	65
M16	230	160
M20	464	325
M24	798	550
M30	1 597	1 100
M36	2 778	1 950

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. Comprehensive information is given in Catalogue GK 1, Bearing Housings http://www.schaeffler.de/std/1B63.

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 SNV for inch size shaft diameters GK 1
• Electronic housing selection wizard http://www.schaeffler.de/std/1B6A