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Super precision bearings

Bearings for screw drives

General features

Design variants

Bearings for screw drives are available as:

  • axial angular contact ball bearings
    • double row, for screw mounting ➤ Figure
    • double row, not for screw mounting ➤ Figure
    • single row, for any combination ➤ Figure
    • angular contact ball bearing unit, for screw mounting ➤ Figure
    • double row or triple row, flange with flattened areas, for screw mounting ➤ Figure
  • needle roller/axial cylindrical roller bearings
    • for screw mounting
    • not for screw mounting
  • with accessories
    • seal carrier assembly
    • precision locknuts
    • sockets
    • free-of-charge calculation using BEARINX-online Easy Ballscrew

Axial angular contact ball bearings

Bearing design

Precision bearings for screw drive bearing arrangements

Axial angular contact ball bearings are precision bearings for screw drive bearing arrangements. Depending on the series, they can support radial forces as well as axial forces in one or both directions. Contact seals protect the rolling element system against contamination and moisture. For higher speeds, non-contact minimal gap seals can be used.

With and without fixing holes

The bearings are available with and without fixing holes in the outer ring. Bearings with holes are screw mounted directly on the adjacent construction. This solution is particularly economical since there is then no need for the locating bore that would otherwise be required or for the bearing cover with the associated matching work.

Available with less stringent tolerances

For some areas of application, a bearing arrangement of lower precision is often sufficient. For this purpose, bearings with less stringent tolerances are available.

Axial angular contact ball bearings, double row, with fixing holes

 
With lip seals or minimal gap seals ZKLF..-2RS, ZKLF..-2Z, ZKLF..-2RS-PE

 
Matched pair ZKLF..-2RS-2AP

Axial angular contact ball bearings, double row, without fixing holes

 
With lip seals or minimal gap seals ZKLN..-2RS, ZKLN..-2Z, ZKLN..-2RS-PE

 
Matched pair ZKLN..-2RS-2AP

Axial angular contact ball bearings, single row, for any combination

 
Without seals 7602, 7603, BSB, BSB..-SU

 
With seals 7602..-2RS, 7603..‑2RS, BSB..-2RS, BSB..‑2Z-SU

Angular contact ball bearing unit, with fixing holes

Lip seals or gap seals ZKLR..-2RS, ZKLR..-2Z

Axial angular contact ball bearings, double or triple row, flange with flattened areas, with fixing holes

 
Double row, lip seals or minimal gap seals ZKLFA..-2RS, ZKLFA..-2Z

 
Triple row, lip seals DKLFA..-2RS


For special requirements

Screw drive bearing arrangements are subjected to requirements that often cannot be optimally fulfilled by the design construction of conventional bearings.

Wide product range

For the design of bearing arrangements that have high accuracy, high load carrying capacity, high rigidity, low friction, are easy to fit and maintenance-free or low-maintenance and are suitable for the highly dynamic operating conditions of threaded spindles, there is a wide range of INA and FAG axial angular contact ball bearings. With this product range, solutions can be found to all the technical and economic demands placed on the bearing arrangements of feed spindles ➤ link.

Single row and multiple row designs

Axial angular contact ball bearings are available as single, double or triple row ready-to-fit units. They are self-retaining and comprise thick-walled, geometrically stable outer rings, ball and cage assemblies and one-piece or two-piece inner rings. In several series, the outer ring has through holes for simple flange mounting of the bearing to the adjacent construction. The bearing rings are matched to each other such that a defined preload is achieved when the rings are clamped in place using a precision locknut.

Axial and radial load capacity

Due to the 60° contact angle, the bearings can support high axial forces as well as radial forces.

In X or O arrangement

In arrangements of multiple row angular contact ball bearings, a distinction is made between O, X and tandem arrangements in relation to the arrangement of contact angles. The arrangement of contact angles has an essential influence on the tilting rigidity of the bearing position.

The characteristics of the O arrangement are:

  • high tilting rigidity
  • higher critical whirling speed of the threaded spindle due to the high tilting rigidity of the bearing position
  • longer rating life under additional radial loads due, for example, to a belt drive

The characteristics of the X arrangement are:

  • low tilting rigidity
  • lower critical whirling speed of the threaded spindle
  • shorter rating life under additional radial loads due, for example, to a belt drive

X-life premium quality

Axial angular contact ball bearings ZKLF and ZKLN are supplied in the X-life design. As a result of increased raceway accuracy and raceway quality, there is a significant reduction in the stress conditions present on the rolling elements and raceways under the same load, compared to the standard bearings. The improved quality gives reduced friction in the bearing and lower bearing temperatures; running resistance is lower, less strain is placed on the lubricant and the grease operating life and, where applicable, necessary relubrication intervals are extended. As a result of the lower frictional energy, there is a simultaneous increase in the energy efficiency of the bearing arrangement.

Higher basic load ratings and limiting speeds with X-life

The basic dynamic loadi ratings Ca of axial angular contact ball bearings in the X-life design are 10% higher than those of the previous standard designs. This leads to a longer rating life L10 or can be used to allow higher loads on the bearing arrangement while achieving the same rating life. The lower bearing friction and associated reduction in heat generation in the bearing permit significantly higher limiting speeds nG grease.

Temperature range

Limiting values

The operating temperature of the bearings is limited by:

  • the dimensional stability of the bearing rings and rolling elements
  • the cage
  • the lubricant
  • the seals

Possible operating temperatures of axial angular contact ball bearings ➤ Table.

Permissible temperature range

Operating temperature

Axial angular contact ball bearings

from

to

–30 °C

+120 °C

The operating temperature influences the dynamic bearing characteristics. The values given in the product tables are based on a room temperature of +20 °C.

Cages

The axial angular contact ball bearings have plastic cages. The cage design is not indicated in the suffix.

In axial angular contact ball bearings 7602, 7603 and BSB, the polyamide cages are indicated by the suffix TVP or T.

Suffixes

For a description of the suffixes used in this chapter ➤ Table and medias interchange http://www.schaeffler.de/std/1B69.

Suffixes and corresponding descriptions

Suffix

Description of suffix

PE

Bearing design with less stringent tolerances

Standard

T, TVP

Polyamide cage

Standard

2AP

Axial angular contact ball bearings,
matched pair (ZKLN, ZKLF)

Standard

2RS

Contact seal on both sides (lip seal)

Standard

2Z

Minimal gap seal on both sides

Standard

L055

Greased with high performance grease
Arcanol Multitop

Standard

SU

Universal bearing; single bearings can be used
in sets in any combination required

Standard

HC

Hybrid Ceramic, rings made from rolling bearing steel, balls made from ceramic

Special design, available by agreement

Needle roller/axial cylindrical roller bearings

Bearing design

Double direction

These precision bearings are double direction axial cylindrical roller bearings with a radial bearing component.

With and without fixing holes

The bearings are available with and without fixing holes in the outer ring. Bearings with holes are screw mounted directly on the adjacent construction. The large contact surface and the small pitch of the holes allow a connection to the adjacent construction that is extremely rigid and with low tendency to settling. There is therefore no need for the bearing cover that would otherwise be required to hold the bearing, and the matching work required.

If the axial abutment of the shaft locating washer is not sufficient or a seal raceway is required, bearings with a stepped shaft locating washer extended on one side are suitable.

Needle roller/axial cylindrical roller bearings, for screw mounting

 
ZARF

 
With stepped shaft locating washer extended on one side ZARF..-L

Needle roller/axial cylindrical roller bearings, not for screw mounting

 
ZARN

 
With stepped shaft locating washer extended on one side ZARN..-L


Features

Needle roller/axial cylindrical roller bearings comprise an outer ring with radial and axial raceways, shaft locating washers, an inner ring, a radial needle roller and cage assembly and axial cylindrical roller and cage assemblies. The bearings are available with or without fixing holes.

Capable of supporting radial and axial loads

In addition to radial forces, the bearings can also support axial forces from both directions and tilting moments.

Preload and internal clearance

The outer ring, inner ring and axial cages are matched to each other such that the bearing is axially clearance-free after preloading by means of an INA precision locknut. The radial internal clearance Group 2 corresponds to ISO 5753-1 (DIN 620-4).

Bearings for screw mounting

Screw mounting of the outer ring: cover and matching work can be dispensed with

Needle roller/axial cylindrical roller bearings ZARF(-L) have holes in the outer ring. These are used for screw mounting directly on the adjacent construction or in a radial locating bore. Due to screw mounting of the outer ring, the cover that would otherwise be required and the matching work can therefore be dispensed with. The bearings are preloaded against the shaft shoulder by means of a locknut AM or ZM(A).

With seal carrier assembly

In the interests of a simpler design, a seal carrier assembly DRS is recommended. The seal carrier assembly is centred on the outer ring and seals the bearing against external influences.

Bearings not for screw mounting

Mounting in the housing bore

Bearings ZARN(-L) are mounted in the housing bore and the outer ring is located using a cover. They are preloaded against the shaft shoulder by means of a locknut AM or ZM(A).

With stepped shaft locating washer

ZARN/F..-L has a stepped shaft locating washer extended on one side. These series are used in preference where the shaft locating washer is not adequately supported axially by the shaft shoulder or the bearing unit cannot be sealed on the outside surface of the normal shaft locating washer due to space conditions in the adjacent construction.

Heavy series

ZARN/F(-L) is also available in a heavy series. This series has a larger cross-section for the same shaft diameter and therefore higher basic load ratings.

Temperature range

Limiting values

The operating temperature of the bearings is limited by:

  • the dimensional stability of the bearing rings and rolling elements
  • the lubricant
  • the seals

Possible operating temperatures of needle roller/axial cylindrical roller bearings ➤ Table.

Permissible temperature range

Operating temperature

Needle roller/axial cylindrical roller bearings

from

to

–30 °C

+120 °C

Suffixes

For a description of the suffixes used in this chapter ➤ Table and medias interchange http://www.schaeffler.de/std/1B69.

Suffixes and corresponding descriptions

Suffix

Description of suffix

L

Stepped shaft locating washer extended on one side

Standard

TVP

Axial bearing cages made from glass fibre reinforced polyamide PA66

Standard

Accessories

Seal carrier assemblies

Complete sealing sets

Seal carrier assemblies DRS are complete sealing sets ➤ Figure that are screw mounted on the outer ring of needle roller/axial cylindrical roller bearings ZARF(-L). They are precisely centred in this position and seal the bearings against external influences ➤ Figure.

Seal carrier assembly DRS


Components of DRS

The sealing elements are supplied as a complete set of individual parts and comprise:

  • a seal flange
  • a rotary shaft seal to DIN 3760, with an elastomer part made from NBR
  • a gasket
  • hexagonal socket head screws for fixing the carrier to the central washer of the bearing

Needle roller/axial cylindrical roller bearing ZARF..-L with seal carrier assembly

 
Seal carrier assembly DRS

 
Precision locknut ZM or ZMA

 
Rotary shaft seal to DIN 3760

Precision locknuts

Precision locknuts are used in the axial preloading of bearings for screw drives

Precision locknuts are used to achieve a defined axial preload in bearings for screw drives. They are also used where high axial forces must be supported and high axial runout accuracy and rigidity are required.

Precision locknuts

 
For axial clamping AM

 
For radial clamping ZM or ZMA

Sockets

For simple tightening and loosening of precision locknuts ZM on shafts, the sockets LOCKNUT-SOCKET-KM ➤ Figure are suitable. In combination with the socket AMS, this socket is also suitable for precision locknuts AM. They require less space on the circumference of the locknut than hook wrenches and allow the use of torque wrenches.

FAG sockets for precision locknuts ZM and sockets AMS

 
Socket AMS

 
Socket LOCKNUT-SOCKET-KM


Secure sockets using a locking pin and rubber washer

For increased reliability, FAG sockets should be secured using a locking pin and rubber washer. They therefore have a hole for the locking pin and a groove for the rubber washer. The locking pin and rubber washer are included in the scope of delivery.

Super precision bearings

Bearings for screw drives

General features

Design variants

Bearings for screw drives are available as:

  • axial angular contact ball bearings
    • double row, for screw mounting ➤ Figure
    • double row, not for screw mounting ➤ Figure
    • single row, for any combination ➤ Figure
    • angular contact ball bearing unit, for screw mounting ➤ Figure
    • double row or triple row, flange with flattened areas, for screw mounting ➤ Figure
  • needle roller/axial cylindrical roller bearings
    • for screw mounting
    • not for screw mounting
  • with accessories
    • seal carrier assembly
    • precision locknuts
    • sockets
    • free-of-charge calculation using BEARINX-online Easy Ballscrew

Axial angular contact ball bearings

Bearing design

Precision bearings for screw drive bearing arrangements

Axial angular contact ball bearings are precision bearings for screw drive bearing arrangements. Depending on the series, they can support radial forces as well as axial forces in one or both directions. Contact seals protect the rolling element system against contamination and moisture. For higher speeds, non-contact minimal gap seals can be used.

With and without fixing holes

The bearings are available with and without fixing holes in the outer ring. Bearings with holes are screw mounted directly on the adjacent construction. This solution is particularly economical since there is then no need for the locating bore that would otherwise be required or for the bearing cover with the associated matching work.

Available with less stringent tolerances

For some areas of application, a bearing arrangement of lower precision is often sufficient. For this purpose, bearings with less stringent tolerances are available.

Axial angular contact ball bearings, double row, with fixing holes


With lip seals or minimal gap seals ZKLF..-2RS, ZKLF..-2Z, ZKLF..-2RS-PE


Matched pair ZKLF..-2RS-2AP

Axial angular contact ball bearings, double row, without fixing holes


With lip seals or minimal gap seals ZKLN..-2RS, ZKLN..-2Z, ZKLN..-2RS-PE


Matched pair ZKLN..-2RS-2AP

Axial angular contact ball bearings, single row, for any combination


Without seals 7602, 7603, BSB, BSB..-SU


With seals 7602..-2RS, 7603..‑2RS, BSB..-2RS, BSB..‑2Z-SU

Angular contact ball bearing unit, with fixing holes

Lip seals or gap seals ZKLR..-2RS, ZKLR..-2Z

Axial angular contact ball bearings, double or triple row, flange with flattened areas, with fixing holes


Double row, lip seals or minimal gap seals ZKLFA..-2RS, ZKLFA..-2Z


Triple row, lip seals DKLFA..-2RS


For special requirements

Screw drive bearing arrangements are subjected to requirements that often cannot be optimally fulfilled by the design construction of conventional bearings.

Wide product range

For the design of bearing arrangements that have high accuracy, high load carrying capacity, high rigidity, low friction, are easy to fit and maintenance-free or low-maintenance and are suitable for the highly dynamic operating conditions of threaded spindles, there is a wide range of INA and FAG axial angular contact ball bearings. With this product range, solutions can be found to all the technical and economic demands placed on the bearing arrangements of feed spindles ➤ link.

Single row and multiple row designs

Axial angular contact ball bearings are available as single, double or triple row ready-to-fit units. They are self-retaining and comprise thick-walled, geometrically stable outer rings, ball and cage assemblies and one-piece or two-piece inner rings. In several series, the outer ring has through holes for simple flange mounting of the bearing to the adjacent construction. The bearing rings are matched to each other such that a defined preload is achieved when the rings are clamped in place using a precision locknut.

Axial and radial load capacity

Due to the 60° contact angle, the bearings can support high axial forces as well as radial forces.

In X or O arrangement

In arrangements of multiple row angular contact ball bearings, a distinction is made between O, X and tandem arrangements in relation to the arrangement of contact angles. The arrangement of contact angles has an essential influence on the tilting rigidity of the bearing position.

The characteristics of the O arrangement are:

  • high tilting rigidity
  • higher critical whirling speed of the threaded spindle due to the high tilting rigidity of the bearing position
  • longer rating life under additional radial loads due, for example, to a belt drive

The characteristics of the X arrangement are:

  • low tilting rigidity
  • lower critical whirling speed of the threaded spindle
  • shorter rating life under additional radial loads due, for example, to a belt drive

X-life premium quality

Axial angular contact ball bearings ZKLF and ZKLN are supplied in the X-life design. As a result of increased raceway accuracy and raceway quality, there is a significant reduction in the stress conditions present on the rolling elements and raceways under the same load, compared to the standard bearings. The improved quality gives reduced friction in the bearing and lower bearing temperatures; running resistance is lower, less strain is placed on the lubricant and the grease operating life and, where applicable, necessary relubrication intervals are extended. As a result of the lower frictional energy, there is a simultaneous increase in the energy efficiency of the bearing arrangement.

Higher basic load ratings and limiting speeds with X-life

The basic dynamic loadi ratings Ca of axial angular contact ball bearings in the X-life design are 10% higher than those of the previous standard designs. This leads to a longer rating life L10 or can be used to allow higher loads on the bearing arrangement while achieving the same rating life. The lower bearing friction and associated reduction in heat generation in the bearing permit significantly higher limiting speeds nG grease.

Temperature range

Limiting values

The operating temperature of the bearings is limited by:

  • the dimensional stability of the bearing rings and rolling elements
  • the cage
  • the lubricant
  • the seals

Possible operating temperatures of axial angular contact ball bearings ➤ Table.

Permissible temperature range

Operating temperature

Axial angular contact ball bearings

from

to

–30 °C

+120 °C

The operating temperature influences the dynamic bearing characteristics. The values given in the product tables are based on a room temperature of +20 °C.

Cages

The axial angular contact ball bearings have plastic cages. The cage design is not indicated in the suffix.

In axial angular contact ball bearings 7602, 7603 and BSB, the polyamide cages are indicated by the suffix TVP or T.

Suffixes

For a description of the suffixes used in this chapter ➤ Table and medias interchange http://www.schaeffler.de/std/1B69.

Suffixes and corresponding descriptions

Suffix

Description of suffix

PE

Bearing design with less stringent tolerances

Standard

T, TVP

Polyamide cage

Standard

2AP

Axial angular contact ball bearings,
matched pair (ZKLN, ZKLF)

Standard

2RS

Contact seal on both sides (lip seal)

Standard

2Z

Minimal gap seal on both sides

Standard

L055

Greased with high performance grease
Arcanol Multitop

Standard

SU

Universal bearing; single bearings can be used
in sets in any combination required

Standard

HC

Hybrid Ceramic, rings made from rolling bearing steel, balls made from ceramic

Special design, available by agreement

Needle roller/axial cylindrical roller bearings

Bearing design

Double direction

These precision bearings are double direction axial cylindrical roller bearings with a radial bearing component.

With and without fixing holes

The bearings are available with and without fixing holes in the outer ring. Bearings with holes are screw mounted directly on the adjacent construction. The large contact surface and the small pitch of the holes allow a connection to the adjacent construction that is extremely rigid and with low tendency to settling. There is therefore no need for the bearing cover that would otherwise be required to hold the bearing, and the matching work required.

If the axial abutment of the shaft locating washer is not sufficient or a seal raceway is required, bearings with a stepped shaft locating washer extended on one side are suitable.

Needle roller/axial cylindrical roller bearings, for screw mounting


ZARF


With stepped shaft locating washer extended on one side ZARF..-L

Needle roller/axial cylindrical roller bearings, not for screw mounting


ZARN


With stepped shaft locating washer extended on one side ZARN..-L


Features

Needle roller/axial cylindrical roller bearings comprise an outer ring with radial and axial raceways, shaft locating washers, an inner ring, a radial needle roller and cage assembly and axial cylindrical roller and cage assemblies. The bearings are available with or without fixing holes.

Capable of supporting radial and axial loads

In addition to radial forces, the bearings can also support axial forces from both directions and tilting moments.

Preload and internal clearance

The outer ring, inner ring and axial cages are matched to each other such that the bearing is axially clearance-free after preloading by means of an INA precision locknut. The radial internal clearance Group 2 corresponds to ISO 5753-1 (DIN 620-4).

Bearings for screw mounting

Screw mounting of the outer ring: cover and matching work can be dispensed with

Needle roller/axial cylindrical roller bearings ZARF(-L) have holes in the outer ring. These are used for screw mounting directly on the adjacent construction or in a radial locating bore. Due to screw mounting of the outer ring, the cover that would otherwise be required and the matching work can therefore be dispensed with. The bearings are preloaded against the shaft shoulder by means of a locknut AM or ZM(A).

With seal carrier assembly

In the interests of a simpler design, a seal carrier assembly DRS is recommended. The seal carrier assembly is centred on the outer ring and seals the bearing against external influences.

Bearings not for screw mounting

Mounting in the housing bore

Bearings ZARN(-L) are mounted in the housing bore and the outer ring is located using a cover. They are preloaded against the shaft shoulder by means of a locknut AM or ZM(A).

With stepped shaft locating washer

ZARN/F..-L has a stepped shaft locating washer extended on one side. These series are used in preference where the shaft locating washer is not adequately supported axially by the shaft shoulder or the bearing unit cannot be sealed on the outside surface of the normal shaft locating washer due to space conditions in the adjacent construction.

Heavy series

ZARN/F(-L) is also available in a heavy series. This series has a larger cross-section for the same shaft diameter and therefore higher basic load ratings.

Temperature range

Limiting values

The operating temperature of the bearings is limited by:

  • the dimensional stability of the bearing rings and rolling elements
  • the lubricant
  • the seals

Possible operating temperatures of needle roller/axial cylindrical roller bearings ➤ Table.

Permissible temperature range

Operating temperature

Needle roller/axial cylindrical roller bearings

from

to

–30 °C

+120 °C

Suffixes

For a description of the suffixes used in this chapter ➤ Table and medias interchange http://www.schaeffler.de/std/1B69.

Suffixes and corresponding descriptions

Suffix

Description of suffix

L

Stepped shaft locating washer extended on one side

Standard

TVP

Axial bearing cages made from glass fibre reinforced polyamide PA66

Standard

Accessories

Seal carrier assemblies

Complete sealing sets

Seal carrier assemblies DRS are complete sealing sets ➤ Figure that are screw mounted on the outer ring of needle roller/axial cylindrical roller bearings ZARF(-L). They are precisely centred in this position and seal the bearings against external influences ➤ Figure.

Seal carrier assembly DRS


Components of DRS

The sealing elements are supplied as a complete set of individual parts and comprise:

  • a seal flange
  • a rotary shaft seal to DIN 3760, with an elastomer part made from NBR
  • a gasket
  • hexagonal socket head screws for fixing the carrier to the central washer of the bearing

Needle roller/axial cylindrical roller bearing ZARF..-L with seal carrier assembly


Seal carrier assembly DRS


Precision locknut ZM or ZMA


Rotary shaft seal to DIN 3760

Precision locknuts

Precision locknuts are used in the axial preloading of bearings for screw drives

Precision locknuts are used to achieve a defined axial preload in bearings for screw drives. They are also used where high axial forces must be supported and high axial runout accuracy and rigidity are required.

Precision locknuts


For axial clamping AM


For radial clamping ZM or ZMA

Sockets

For simple tightening and loosening of precision locknuts ZM on shafts, the sockets LOCKNUT-SOCKET-KM ➤ Figure are suitable. In combination with the socket AMS, this socket is also suitable for precision locknuts AM. They require less space on the circumference of the locknut than hook wrenches and allow the use of torque wrenches.

FAG sockets for precision locknuts ZM and sockets AMS


Socket AMS


Socket LOCKNUT-SOCKET-KM


Secure sockets using a locking pin and rubber washer

For increased reliability, FAG sockets should be secured using a locking pin and rubber washer. They therefore have a hole for the locking pin and a groove for the rubber washer. The locking pin and rubber washer are included in the scope of delivery.