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Single Row Cylindrical Roller Bearings

The rollers in a single row cylindrical roller bearing are always guided between the integral "open" flanges on one of the rings. These "open" flanges combined with the specially designed and surface treated roller ends, provide improved lubrication, reduced friction and consequently lower operating temperature.

Single Row Cylindrical RollerBearing

The ring with the integral flanges together with the cylindrical roller and cage assembly can be separated from the other ring. This results in easy mounting and dismounting, particularly where the load conditions are such that interference fits are required for both rings.

SKF single row cylindrical roller bearings can accommodate heavy radial loads and high speeds. They are manufactured in several different designs, the main difference being in the configuration of the flanges. The most popular are the NU, N, NJ and NUP designs.

NU designThe outer ring of bearings of the NU design has two integral flanges and the inner ring is without flanges. Axial displacement of the shaft with respect to the housing can be accommodated in both directions within the bearing itself. The bearings are therefore used as non-locating bearings. For manufacturing and maintenance reasons, the two outer ring flanges of large-size bearings of the NU design which are identified by a Drawing No. may not be integral but take the form of loose flange rings.

Single Row Cylindrical Roller Bearing NU Design

N designThe inner ring has two integral flanges and the outer ring is without flanges. Axial displacement of the shaft with respect to the housing can be accommodated in both directions within the bearing itself. The bearings are therefore used as non-locating bearings.

Single Row Cylindrical Roller Bearing N Design

NJ designThe outer ring has two integral flanges and the inner ring one integral flange. The bearings are therefore suitable for the axial location of a shaft in one direction, see also under "Dynamic axial load carrying capacity".

Single Row Cylindrical Roller Bearing NJ Design

NUP designThe outer ring has two integral flanges and the inner ring one integral flange and one non-integral flange in the form of a loose flange ring. The bearings can be used as locating bearings, i.e. they can provide axial location for a shaft in both directions, see also under "Dynamic axial load carrying capacity".

Single Row Cylindrical Roller Bearing NUP Design

Single row cylindrical roller bearings: Design variants

NUZ designAs the NU design but without the lead-in (tapered transition between inner ring raceway and inner ring side faces) at both sides of the inner ring.

NUB designThe outer ring of bearings of the NUB design has two integral flanges and an inner ring without flanges that is extended at both sides. Axial displacement of the shaft with respect to the housing can be accommodated in both directions within the bearing itself.

Single Row Cylindrical Roller Bearing NUB Design

NUBZ designAs the NUB design but without the lead-in (tapered transition between inner ring raceway and inner ring side faces) at both sides of the inner ring.

Single Row Cylindrical Roller Bearing NUBZ Design

NB designThe inner ring has two integrapanl flanges and the outer ring is without flanges and is extended at both sides. Axial displacement of the shaft with respect to the housing can be accommodated in both directions within the bearing itself.

Single Row Cylindrical Roller Bearing NB Design

NJP designThe outer ring has two integral flanges and the inner ring has a loose flange ring. The bearings are therefore suitable for the axial location of a shaft in one direction, see also under "Dynamic axial load carrying capacity"

Single Row Cylindrical Roller Bearing NJP Design

NJF designBoth inner and outer rings have one integral flange. The bearings can therefore be used to axially locate a shaft in one direction, see also under "Dynamic axial load carrying capacity".

Single Row Cylindrical Roller Bearing NJF Design

NF designThe inner ring has two integrspanl flanges and the outer ring one integral flange. The bearings can locate a shaft axially in one direction, see also under "Dynamic axial load carrying capacity".

Single Row Cylindrical Roller Bearing NF Design

NFP designAs the NF design, but with a looanse flange ring instead of the integral flange in the outer ring.

Single Row Cylindrical Roller Bearing NFP Design

NP designThe inner ring has two integral flanges and the outer ring one integral flange and one loose flange ring. The bearings can be used to locate a shaft axially in both directions, see also under "Dynamic axial load carrying capacity".

Single Row Cylindrical Roller Bearing: NP Design

Single row cylindrical roller bearings with inch dimensions

Inch single row cylindrical roller bearings for the aftermarket also belong to the SKF standard assortment. The dimensions of these bearings follow the British Standard BS 292:Part 2:1982. This standard has subsequently been withdrawn in 1997 as a consequence of metrication. It is recommended not to use these inch bearings for new bearing arrangement designs.

DesignsInch bearings, series designations CRL and CRM, have an inner ring with two integral flanges while the outer ring has no flanges. Accordingly their design conforms to that of the metric N design bearings, which can accommodate axial displacements of the shaft relative to the housing, within the bearing.

Cylindrical roller bearing with inch dimensions

CagesDepending on the size, SKF inch single row cylindrical roller bearings are equipped as standard with one of the following cages:

  • Unhardened pressed window-type steel cage, roller centred, no designation suffix.
  • Two-piece machined brass cage, inner ring centred, designation suffix MB.

Tolerances and internal clearanceInch bearings are manufactured to Normal tolerances, according to standard BS 292:Part 2:1982 and with Normal radial internal clearance, which conform to ISO 5753:1991.

Single row cylindrical roller bearings: Angle rings

Angle rings, series designation HJ, are designed to stabilize NU and NJ design cylindrical roller bearings in the axial direction. There can be several reasons to incorporate them in designs:

NU designation Bearing with HJ angle ring

NJ designation bearing with HJ angle ring

  • NJ or NUP design locating bearings are not available.
  • To provide a more stable seat in heavily loaded locating bearing arrangements with NJ design bearings, having a full width inner ring, instead of using an NUP

design bearing, that has a shorter inner ring and a loose flange.

  • To simplify the design and/or mounting/dismounting procedures.

SKF angle rings, manufactured from carbon chromium steel are hardened and ground. The maximum permissible side face runout conforms to the SKF Normal tolerances for the appropriate bearing. The HJ angle rings, where available, are listed in the product table with their designation and dimensions together with the relevant bearing.

NU design + HJ angle ringAn NU design bearing combined with an HJ angle can be used to locate the shaft axially in one direction. SKF recommends not to fit standard angle rings at both sides of an NU design bearing as this can lead to axial compression of the rollers.

NU designation Bearing with HJ angle ring

NJ design + HJ angle ringAn NJ design bearing combined with an HJ angle ring can be used to locate the shaft axially in both directions.

NJ designation bearing with HJ angle ring

Single row cylindrical roller bearings without an inner or an outer ring

The SKF programme also includes a selection of

  • NU design cylindrical roller bearings without an inner ring – designation prefix RNU
  • RNU designation Bearing

  • N design bearings without an outer ring – designation prefix RN
  • RN designation Bearing

These bearings provide a solution for applications were hardened and ground raceways are provided on the shaft or in the housing bore. Because RNU design bearings, for example, do not need an inner ring, the bearing arrangement design can be downsized or the shaft diameter can be larger to provide a stronger, stiffer arrangement. Additionally, the possible axial displacement of the shaft relative to the housing is only limited by the width of the raceway on the shaft for the RNU design or in the housing bore for the RN design.

A selection of RNU design cylindrical roller bearings is listed in product table “Cylindrical roller bearings, single row, without inner ring”. In case of RNU design bearings the inside diameter Fw of the roller complement, when the rollers are in contact with the outer ring raceway, lies within the limits of tolerance F6. Generally, SKF recommends machining the raceways on the shaft to g6 tolerance and the seats in the housing to K6 tolerance. For additional information on machining and materials of raceways see section "Raceways on shafts and in housings" or contact the SKF application engineering service.

Single row cylindrical roller bearings: Special designs

Bearings with a tapered bore

SKF single row cylindrical roller bearings are generally produced with a cylindrical bore. However, some bearings with a tapered bore 1:12 can be supplied. Bearings with a tapered bore have a somewhat larger radial internal clearance table 2 than corresponding bearings with a cylindrical bore and are identified by the designation suffix K. Contact SKF for availability.

Bearing with a tapered bore

Bearings with a snap ring groove

Some single row cylindrical roller bearings are also produced with a snap ring groove in the outer ring. These bearings are identified by the designation suffix N. Because they can be located axially in the housing bore by a retaining or snap ring, the arrangement design can be simplified and made more compact. Contact SKF for availability before ordering.

Bearing with a snap ring groove in the outer ring

The dimensions of the snap ring groove and of the chamfer adjacent to the groove are in accordance with ISO 464:1995, which also specifies suitable snap ring dimensions.

Dimensions of the snap ring groove

Bearings with locating slots

In some applications where it is essential that mounting and dismounting can be done easily, outer rings have to be mounted with clearance fits in the housing. To restrain the outer ring from turning in the circumferential direction, some single row cylindrical roller bearings are also produced with

  • one locating slot, designation suffix N1, or
  • two locating slots positioned 180° apart, designation suffix N2, in one outer ring side face.
  • Two locating slots, designation suffix N2

Please contact SKF for availability before ordering. The dimensions of the locating slots are in accordance with DIN 5412-1:2000.

SKF Explorer class bearings

High performance SKF Explorer cylindrical roller bearings are shown with an asterisk in the product table. SKF Explorer bearings retain the designation of earlier standard bearings, e.g. NU 216 ECP. However, each bearing and its box are marked with the name "EXPLORER".

Single row cylindrical roller bearings

Single row cylindrical roller bearings dimensions

The dimensions of the standard SKF single row cylindrical roller bearings (identified by a standard series designation and not by a Drawing No.) are in accordance with ISO 15:1998.

The dimensions of the HJ angle rings correspond to those specified in ISO 246:1995.

Single row cylindrical roller bearings tolerances

SKF single row cylindrical roller bearings are manufactured to Normal tolerances for dimensional accuracy and to P6 tolerances for running accuracy as standard. Some bearings, particularly those of the narrow series 18, 19 and 10, are also available with higher accuracy to tolerance class P6 or P5.

The tolerances are in accordance with ISO 492:2002.

Single row cylindrical roller bearings: Radial internal clearance

SKF single row cylindrical roller bearings are manufactured with Normal radial internal clearance as standard and most of the bearings are also available with C3 radial internal clearance. Some of the bearings can even be supplied with the smaller C2 or the appreciably greater C4 clearance. In addition, some bearings are produced with special reduced clearances. This special clearance corresponds to a section of a standard clearance range or to sections of two adjacent clearance ranges.

Bearings with non-standard clearance or with the special reduced clearances can be supplied to special order.

The actual clearance limits for bearings with a cylindrical bore are provided in table 1 and for bearings with a tapered bore in table 2 and are in accordance with ISO 5753:1991. They are valid for unmounted bearings under zero measuring load.

The separable components of all SKF bearings with standard clearance as well as those with reduced clearance are interchangeable.

Single row cylindrical roller bearings: Axial internal clearance

NUP-design cylindrical roller bearings, which can locate a shaft axially in both directions, are manufactured with an axial internal clearance as shown in table 3. The axial internal clearance of NJ-design bearings when combined with an HJ angle ring is specified in table 4.

The clearance limits quoted in tables 3 and 4 should be considered as guideline values. When axial internal clearance is measured, the rollers may tilt, causing an enlargement of the axial clearance, which may be as much as

  • the radial internal clearance of bearings in the 2, 3 and 4 series or
  • 2/3 of the radial internal clearance for bearings in the 22 and 23 series,

for example.

Single row cylindrical roller bearings: Misalignment

The ability of single row cylindrical roller bearings to accommodate angular misalignment of the inner ring with respect to the outer ring is limited to a few minutes of arc. The actual values are

  • 4 minutes of arc for bearings in the 10, 12, 2, 3 and 4 series
  • 3 minutes of arc for bearings in the 20, 22 and 23 series.

These guideline values apply to non-locating bearings, provided the positions of the shaft and housing axes remain constant. Larger misalignments may be possible but may result in shorter bearing service life. In such cases, it is advisable to contact the SKF application engineering service.

When the bearings are used to locate the shaft axially, guideline values must be reduced, as uneven flange loading can lead to increased wear and possibly even to flange fracture.

The maximum values for misalignment do not apply to bearings of the NUP design or bearings of the NJ design with an HJ angle ring. Because these bearings have two inner and two outer ring flanges and the axial internal clearance is relatively small, axial stresses may be induced in the bearing. In case of doubt, it is advisable to contact the SKF application engineering service.

Single row cylindrical roller bearings: Axial displacement

Cylindrical roller bearings with a flangeless inner or outer ring, NU and N designs, and NJ design bearings with one integral flange at the inner ring can accommodate axial displacement of the shaft with respect to the housing as a result of thermal expansion within certain limits. As the axial displacement takes place within the bearing and not between the bearing and shaft or housing bore, there is practically no increase in friction as the bearing rotates. Values for the permissible axial displacement "s" from the normal position of one bearing ring relative to the other are provided in the product table.

Bearing Axial displacement

Influence of operating temperature on bearing material

SKF cylindrical roller bearings undergo a special heat treatment. When equipped with a steel, brass or PEEK cage, they can operate at temperatures of up to +150 °C.

Single row cylindrical roller bearings: Cages

Depending on the bearing series, size and design, SKF single row cylindrical roller bearings are fitted as standard with one of the following cages.

  • an injection moulded window-type cage of glass fibre reinforced polyamide 66, roller centred, designation suffix P
  • Injection moulded window-type cage of glass fibre reinforced polyamide 66

  • a pressed window-type cage of unhardened steel, roller centred, designation suffix J
  • Pressed window-type cage of unhardened steel

  • a one-piece machined window-type brass cage, inner or outer ring centred, designation suffixes ML or MP
  • One-piece machined window-type brass cage

  • a two-piece machined brass cage, roller centred, designation suffix M, or outer ring centred, designation suffix MA, or inner ring centred, designation suffix MB
  • Two-piece machined brass cage

Large cylindrical roller bearings can be equipped with steel pin-type cage for pierced rollers.

Steel pin-type cage for pierced rollers

A large number of bearings included in the SKF standard assortment are available as standard with more than one cage design so that bearings with cages appropriate to the operating conditions can be chosen (see product table).

For demanding applications, like compressors, the use of SKF bearings with an injection moulded cage of glass fibre reinforced polyetheretherketone (PEEK) has become more common. The exceptional properties of PEEK are superior combination of strength and flexibility, high operating temperature range, high chemical and wear resistance and good processability. If bearings with a PEEK cage are required, please consult the SKF application engineering service.

NoteSingle row cylindrical roller bearings with polyamide 66 cages can be operated at operating temperatures up to +120 °C. The lubricants generally used for rolling bearings do not have a detrimental effect on cage properties, with the exception for a few synthetic oils and greases with synthetic base oil as well as some lubricants containing a high proportion of EP additives when used at elevated temperatures.

For bearing arrangements, which are to operate at continuously high temperatures or under difficult conditions, the use of bearings with a metallic cage is recommended. For applications in equipment using refrigerants such as ammonia or freon replacements, bearings with a polyamide cage can be used for operating temperatures up to 70 °C. At higher operating temperatures bearings incorporating a machined brass, steel or PEEK cage should be used.

For detailed information regarding the temperature resistance and the applicability of cages, please refer to the section "Cage materials".

Single row cylindrical roller bearings: Minimum load

To achieve satisfactory operation, single row cylindrical roller bearings, like all ball and roller bearings, must always be subjected to a given minimum load, particularly if they are to operate at high speeds or are subjected to high accelerations or rapid changes in the direction of load. Under such conditions, the inertia forces of the rollers and cage, and the friction in the lubricant, can have a detrimental influence on the rolling conditions in the bearing arrangement and may cause damaging sliding movements to occur between the rollers and raceways.

The requisite minimum load to be applied to single row cylindrical roller bearings can be estimated using

where

Frm = minimum radial load [kN]

kr = minimum load factor (see product data)

n = rotational speed [r/min]

nr = reference speed [r/min] (see product data)

dm = mean diameter of bearing

= 0,5 (d + D) [mm]

When starting up at low temperatures or when the lubricant is highly viscous, even greater minimum loads may be required. The weight of the components supported by the bearing, together with external forces, generally exceeds the requisite minimum load. If this is not the case, the single row cylindrical roller bearing must be subjected to an additional radial load.

Dynamic axial load carrying capacity

Single row cylindrical roller bearings with flanges on both the inner and outer rings can support axial loads in addition to radial loads. Their axial load carrying capacity is primarily determined by the ability of the sliding surfaces of the roller end / flange contact to support loads. Factors having the greatest effect on this ability are the lubricant, operating temperature and heat dissipation from the bearing.

Calculating the dynamic axial load carrying capacity Under normal operating conditions the axial load carrying capacity can be estimated using the equations below. Conditions that are considered typical for normal bearing operation are:

  • a certain temperature gradient
  • There is a difference of 60 °C between the bearing operating temperature and the ambient temperature.

  • a specific heat loss from the bearing

There is a flow of 0,5 mW/mm2 °C; with reference to the bearing outside diameter surface (A = p D B).

  • adequate lubrication

A viscosity ratio K ≥ 2 is required ("Lubrication conditions - the viscosity ratio K"). For grease lubricated applications, the viscosity of the base oil in the grease may be used. If K is less than 2, friction and wear will increase. These effects can be reduced at low speeds, for example, by using lubricants with AW (anti-wear) or EP (extreme pressure) additives. In grease lubricated applications where axial loads act for long periods, the bearings should be relubricated frequently with a grease that has good oil bleeding properties at normal operating temperature (> 3% according to DIN 51 817).

  • sufficient radial load

The value of the radial load should be at least twice the value of the axial load. A lower ratio (axial versus radial load) is possible, but should be checked by the SKF application engineering service.

  • limited misalignment

Where misalignment between the inner and outer rings exceeds 1 minute of arc, the action of the load on the flange changes considerably. Therefore the safety factors included in the guideline values may be inadequate. In these cases, contact the SKF application engineering service.

For bearings with a heat emitting reference surface area Ar = 50 000 mm2, the permissible axial load can be calculated with sufficient accuracy from

Fap = k1 C0 104 / (n (d + D)) - k2 Fr

For bearings with a heat emitting reference surface area Ar > 50 000 mm2, the permissible axial load can be calculated with sufficient accuracy from

Fap = k1 C0 2/3 7.5 × 104 / (n (d + D)) - k2 Fr

When circulating oil lubrication provides efficient cooling, the permissible axial load can be raised by

ΔFap = k1 ?Ts Vs 15 × 104 / (n (d + D))

where

Ar= heat emitting reference surface area in accordance with ISO 15312:2003
= p B (D + d) [mm2]
Fap= permissible axial load [kN]
ΔFap= raise for permissible axial load due to cooling [kN]
C0= basic static load rating [kN]
Fr= actual radial bearing load [kN]
n= rotational speed [r/min]
d= bearing bore diameter [mm]
D= bearing outside diameter [mm]
B= bearing width [mm]
ΔTs= temperature difference between oil inlet and outlet [°C]
Vs= oil flow through the bearing [l/min]
k1= a factor
= 1.5 for oil lubrication
= 1 for grease lubrication
k2= a factor
= 0.15 for oil lubrication
= 0.1 for grease lubrication
The values for the permissible load Fap obtained from the equations are valid for a constant and continuous axial load provided there is an adequate supply of lubricant to the roller end / flange contacts. Where axial loads act only for short periods, the values can be multiplied by 2. For shock loads the values can be multiplied by 3, provided the following limits relative to flange strength are not exceeded. A short period can last anywhere from several seconds to a few minutes. It is characterized by a temperature spike of not more than 5 °C after which time the bearing returns to normal operating temperature. As a rule of thumb, a short period is considered as the time it takes for the bearing to make 1 000 revolutions. Values calculated according to the above equations are not hard limits. If higher axial load carrying capacity than calculated is required, contact the SKF application engineering service for detailed analysis.

Axial load limit relative to flange strengthTo avoid the risk of flange fracture, the constantly acting axial load applied to the bearings should never exceed

Famax = 0.0045 D1.5 (bearings in the 2 Diameter Series)

or

Famax = 0.0023 D1.7 (bearings in other Dimension series)

where

Famax= maximum constantly acting axial load [kN]
D= bearing outside diameter [mm]
Where axial loads act only for short periods, the values for Famax can be multiplied by a factor of 2 while shock loads can be multiplied by a factor of 3.

Requirements for abutments In applications where single row cylindrical roller bearings are subjected to heavy axial loads, axial runout and the size of the abutment surfaces of adjacent components can affect flange load and running accuracy. To obtain an even flange load and provide proper running accuracy, use the values provided in the table. For the diameter of the abutment surfaces, SKF recommends supporting the inner ring at a height corresponding to half the flange height.

Abutment diameter for proper flange support

das = 0.5 (d1 + F)

where

das= shaft abutment diameter [mm]
d1= inner ring flange diameter [mm]
F= inner ring raceway diameter [mm]

Equivalent dynamic bearing load

For non-locating bearings

P = Fr

If bearings with flanges on both inner and outer rings are used to locate a shaft in one or both directions, the equivalent dynamic bearing load should be calculated using

P = F when Fa/Fr = e

P = 0.92 Fr + YFa when Fa/Fr ≤ e

where

e= limiting value
= 0.2 for bearings in the 18, 19, 10, 2, 3 and 4 series
= 0.3 for bearings in other series
Y= axial load factor
= 0.6 for bearings in the 18, 19, 10, 2, 3 and 4 series
= 0.4 for bearings in other series

Since axially loaded cylindrical roller bearings only operate satisfactorily when they are subjected to a simultaneously acting radial load, the ratio Fa/Fr should not exceed 0.5.

Equivalent static bearing load

P0 = Fr

Single row cylindrical roller bearings supplementary designations

The designation suffixes used to identify certain features of SKF single row cylindrical roller bearings are explained in the following.

DesignationBearing Features
B20Reduced width tolerance
CNNormal radial internal clearance; normally only used together with an additional letter that identifies a reduced or displaced clearance range
FReduced and displaced clearance range covering the uppermost quarter of the actual clearance plus the the lowest quarter of the next greater clearance range.
HReduced clearance range corresponding to the upper half of the actual clearance range
LReduced clearance range corresponding to the lower half of the actual clearance range
MReduced clearance range corresponding to the two middle quarters of the actual clearance range
RReduced clearance range corresponding to "paired rings" specified in ISO 5753:1981.

 

The above letters are also used together with the clearance class suffixes C2, C3, C4 and C5

C2Radial internal clearance less than Normal
C3Radial internal clearance greater than Normal
C4Radial internal clearance greater than C3
C5Radial internal clearance greater than C4
DModified internal design
ECOptimized internal design incorporating more and/or larger rollers and with modified roller/end flange contact
HA3Case-hardened inner ring
HB1Bainite hardened inner and outer rings
HN1Inner and outer rings with special surface heat treatment
JPressed steel cage, roller centred, unhardened
KTapered bore, taper 1:12
MTwo-piece machined brass cage, roller centred
MATwo-piece machined brass cage, outer ring centred
MASAs MA but with lubrication grooves in the guiding surfaces
MBTwo-piece machined brass cage, inner ring guided
MBSAs MB but with lubrication grooves in the guiding surfaces
MLOne-piece form-turned window-type brass cage, inner or outer ring centred
MPOne-piece window-type brass cage with milled, reamed or broached pockets, inner or outer ring centred
MPSAs MP but with lubrication grooves in the guiding surfaces
MROne-piece form-turned window-type brass cage, roller centred
NSnap ring groove in the outer ring
NRSnap ring groove in the outer ring, with appropriate snap ring
N1One locating slot (notch) in one outer ring side face
N2Two locating slots 180° apart in one outer ring side face
PInjection moulded cage of glass fibre reinforced polyamide 66, roller centred
PHInjection moulded cage of glass fibre reinforced polyetheretherketone (PEEK), roller centred
PHAInjection moulded cage of glass fibre reinforced polyetheretherketone (PEEK), outer ring centred
P5Dimensional and running accuracy to ISO tolerance class 5
P6Dimensional and running accuracy to ISO tolerance class 6
S1Bearing rings dimensionally stabilized for operating temperatures up to +200 °C
S2Bearing rings dimensionally stabilized for operating temperatures up to +250 °C
TN9Injection moulded cage of glass fibre reinforced polyamide 66
VA301Bearing for railway vehicle traction motors
VA305VA301 + special inspection routines
VA350Bearing for railway axleboxes
VA380Bearing for railway axleboxes according to EN 12080:1998, class 1
VA3091VA301 + VL0241
VC025Bearing with specially wear-resistant raceways for applications in heavily contaminated environments
VL0241Aluminium oxide coated outside surface of the outer ring for electrical resistance up to 1 000 V DC
VL2071Aluminium oxide coated outside surface of the inner ring for electrical resistance up to 1 000 V DC
VQ015Inner ring with crowned raceway for increased permissible misalignment


Cylindrical roller bearings | Single row cylindrical roller bearings | Double row cylindrical roller bearings | Multi-row cylindrical roller bearings | Single row full complement cylindrical roller bearings | Double row full complement cylindrical roller bearings | Multi-row full complement cylindrical roller bearings | Split cylindrical roller bearings

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This page is still under construction. All bearing information remains the property and copyright of SKF Group.