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RA Series Cross Roller Bearings

RA bearings provide a narrow bearing section for rotary assemblies with limited installation space. Use this category to find individual RA model pages and the series dimension table. Check the mounting support, rotating ring and required stiffness together with the available envelope.

Browse RA series · Request a drawing or quote

Selecting RA bearings

RA bearings provide a narrow bearing section for rotary assemblies with limited installation space. Use this category to find individual RA model pages and the series dimension table. Check the mounting support, rotating ring and required stiffness together with the available envelope.

  • Bore, outside diameter and 8 mm or 13 mm width in the listed range
  • Shaft and housing shoulders and retaining-flange dimensions
  • Radial clearance or preload and measured rotational accuracy

RAU reference designs can share RA boundary dimensions while using a different ring construction. Match the full configuration before considering an alternative. Compare the related series.

Published RA model pages

RA10008 · RA12008 · RA8008 · RA11008 · RA9008 · RA5008 · RA14008 · RA20013 · RA16013 · RA18013

RA series tables

Read all dimensions against the matching drawing. Blank values mean unspecified, not zero. Reference numbers do not establish full interchangeability.

RA dimensional comparison
LYDL designationd (mm)D (mm)B (mm)Dpw (mm)ds (mm)Dh (mm)Cr (kN)C0r (kN)Mass (kg)Reference designation
LRA 5008506685753.560.55.17.190.08RA5008
LRA 6008607686763.570.55.688.680.09RA6008
LRA 7008708687773.580.55.989.80.1RA7008
LRA 8008809688783.590.56.3711.30.11RA8008
LRA 90089010689793.5100.56.7612.40.12RA9008
LRA 100081001168107103.5110.57.1513.90.14RA10008
LRA 110081101268117113.5120.57.45150.15RA11008
LRA 120081201368127123.5130.57.8416.50.17RA12008
LRA 130081301468137133.5140.57.9417.60.18RA13008
LRA 140081401568147143.5150.58.3319.10.19RA14008
LRA 150081501668157153.5160.58.8220.60.2RA15008
LRA 160131601861317216517923.344.90.59RA16013
LRA 170131701961318217518923.546.50.64RA17013
LRA 180131802061319218519924.549.80.68RA18013
LRA 190131902161320219520924.951.50.69RA19013
LRA 200132002261321220521925.854.70.71RA20013
Separate 5 mm ultra-thin reference family
LYDL designationd (mm)D (mm)B (mm)Dpw (mm)ds (mm)Dh (mm)Cr (kN)C0r (kN)Mass (kg)Reference designation
LRBT2052031525.522.5271.41.290.014RAU2005
LRBT3053041535.532.5371.771.970.02RAU3005
LRBT4054051545.542.54722.520.026RAU4005
XRBT5055061555.552.5572.283.20.032RAU5005
Separate RA-C reference family
LYDL designationd (mm)D (mm)B (mm)Dpw (mm)ds (mm)Dh (mm)Cr (kN)C0r (kN)Mass (kg)Reference designation
LRA5008C506685753.560.55.17.190.08RA5008C
LRA6008C607686763.570.55.688.680.09RA6008C
LRA7008C708687773.580.55.989.80.1RA7008C
LRA8008C809688783.590.56.3711.30.11RA8008C
LRA9008C9010689793.5100.56.7612.40.12RA9008C
LRA10008C1001168107103.5110.57.1513.90.14RA10008C
LRA11008C1101268117113.5120.57.45150.15RA11008C
LRA12008C1201368127123.5130.57.8416.50.17RA12008C
LRA13008C1301468137133.5140.57.9417.60.18RA13008C
LRA14008C1401568147143.5150.58.3319.10.19RA14008C
LRA15008C1501668157153.5160.58.8220.60.2RA15008C
LRA16013C1601861317216517923.344.90.59RA16013C
LRA17013C1701961318217518923.546.50.64RA17013C
LRA18013C1802061319218519924.549.80.68RA18013C
LRA19013C1902161320219520924.951.50.69RA19013C
LRA20013C2002261321220521925.854.70.71RA20013C

Reference corrections: RA9008 / RA9008C Cr = 6.76 kN; RA10008 / RA10008C mass = 0.14 kg; RA11008 / RA11008C mass = 0.15 kg. Source: THK catalogue 513K, A18-33–34. These are catalogue comparison values; confirm the LYDL specification for the ordered configuration.

Reference illustrations

RA bearing reference illustration

Drawing and reference information

The RA table lists 50–200 mm bores. Catalogue load ratings and mass can differ between designations and source editions; the approved LYDL drawing controls the supplied item.

Technical reference: THK RAU / RA dimensional-family information. Brand names identify reference families only. Supplied LYDL dimensions, tolerances, load ratings and acceptance requirements are defined by the drawing and quotation agreed for the order.

Request a drawing or quote with the complete model, quantity, loads, speed, duty cycle and mounting requirements.