• KOYO IR, IRA Inner Rings for Inch Drawn Cup Bearings
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KOYO IR, IRA Inner Rings for Inch Drawn Cup Bearings

KOYO IR, IRA Inner Rings for Inch Drawn Cup Bearings

IR and IRA inner rings for inch-series drawn cup needle roller bearings; IRA types provide additional length where required.

Key features

  • Hardened and ground raceway
  • IR standard and IRA extended types
  • Inch nominal sizes (shown in mm, max. values)
  • Use when shaft cannot serve as raceway

Specifications

Product type Needle bearing inner ring
Series IR, IRA
Dimension system Inch (values in mm)
Source KOYO Needle Roller Bearings catalogue, p. B-2-73 to B-2-74
IRA-3 d: 4.826 mm | F: 9.525 mm | B: 13.61 mm | r: 0.64 mm
IRA-4 d: 6.350 mm | F: 11.113 mm | B: 13.61 mm | r: 0.64 mm
IRA-5 d: 7.938 mm | F: 12.700 mm | B: 13.61 mm | r: 0.64 mm
IR-68 d: 9.525 mm | F: 14.288 mm | B: 13.08 mm | r: 0.64 mm
IR-612 d: 9.525 mm | F: 14.288 mm | B: 19.43 mm | r: 0.64 mm
IRA-6 d: 9.525 mm | F: 14.288 mm | B: 19.96 mm | r: 0.64 mm
IR-68-1 d: 9.525 mm | F: 15.875 mm | B: 13.08 mm | r: 0.64 mm
IR-612-1 d: 9.525 mm | F: 15.875 mm | B: 19.43 mm | r: 0.64 mm
IRA-7 d: 11.113 mm | F: 15.875 mm | B: 19.96 mm | r: 0.64 mm
IR-88 d: 12.700 mm | F: 19.050 mm | B: 13.08 mm | r: 1.02 mm
IR-812 d: 12.700 mm | F: 19.050 mm | B: 19.43 mm | r: 1.02 mm
IRA-20 d: 31.750 mm | F: 38.100 mm | B: 32.66 mm | r: 1.52 mm
IR-2220 d: 34.925 mm | F: 41.275 mm | B: 32.13 mm | r: 1.52 mm
IR-2316 d: 36.513 mm | F: 44.450 mm | B: 25.78 mm | r: 1.52 mm
IR-2324 d: 36.513 mm | F: 44.450 mm | B: 38.48 mm | r: 1.52 mm
IR-2416 d: 38.100 mm | F: 44.450 mm | B: 25.78 mm | r: 1.52 mm
IR-2424 d: 38.100 mm | F: 44.450 mm | B: 38.48 mm | r: 1.52 mm
IR-2724 d: 42.863 mm | F: 52.388 mm | B: 38.48 mm | r: 1.52 mm
IR-2824 d: 44.450 mm | F: 52.388 mm | B: 38.48 mm | r: 1.52 mm
IR-2916 d: 46.038 mm | F: 52.388 mm | B: 25.78 mm | r: 1.52 mm
IR-2924 d: 46.038 mm | F: 52.388 mm | B: 38.48 mm | r: 1.52 mm
IR-3024 d: 47.625 mm | F: 53.975 mm | B: 38.48 mm | r: 1.52 mm
IR-4016 d: 63.500 mm | F: 69.850 mm | B: 25.78 mm | r: 1.52 mm
Needle Roller BearingsKOYO
23 product codes available in this family
Sourced direct from KoreaExport-ready supplyCompetitive pricing
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KOYO IR, IRA Inner Rings for Inch Drawn Cup Bearings

Brand KOYO·Needle Roller Bearings

Available part numbers (23)

IRA-3, IRA-4, IRA-5, IR-68, IR-612, IRA-6, IR-68-1, IR-612-1, IRA-7, IR-88 + 13 more — see full table ↓

How to order

Send the KOYO part numbers and quantities through our RFQ form or to info@prosourcemro.com. We confirm price, availability and lead time within 1 business day — no account needed.

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Product codes & specifications
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Product codeSpec
IRA-3d: 4.826 mm | F: 9.525 mm | B: 13.61 mm | r: 0.64 mm
IRA-4d: 6.350 mm | F: 11.113 mm | B: 13.61 mm | r: 0.64 mm
IRA-5d: 7.938 mm | F: 12.700 mm | B: 13.61 mm | r: 0.64 mm
IR-68d: 9.525 mm | F: 14.288 mm | B: 13.08 mm | r: 0.64 mm
IR-612d: 9.525 mm | F: 14.288 mm | B: 19.43 mm | r: 0.64 mm
IRA-6d: 9.525 mm | F: 14.288 mm | B: 19.96 mm | r: 0.64 mm
IR-68-1d: 9.525 mm | F: 15.875 mm | B: 13.08 mm | r: 0.64 mm
IR-612-1d: 9.525 mm | F: 15.875 mm | B: 19.43 mm | r: 0.64 mm
IRA-7d: 11.113 mm | F: 15.875 mm | B: 19.96 mm | r: 0.64 mm
IR-88d: 12.700 mm | F: 19.050 mm | B: 13.08 mm | r: 1.02 mm
IR-812d: 12.700 mm | F: 19.050 mm | B: 19.43 mm | r: 1.02 mm
IRA-20d: 31.750 mm | F: 38.100 mm | B: 32.66 mm | r: 1.52 mm
IR-2220d: 34.925 mm | F: 41.275 mm | B: 32.13 mm | r: 1.52 mm
IR-2316d: 36.513 mm | F: 44.450 mm | B: 25.78 mm | r: 1.52 mm
IR-2324d: 36.513 mm | F: 44.450 mm | B: 38.48 mm | r: 1.52 mm
IR-2416d: 38.100 mm | F: 44.450 mm | B: 25.78 mm | r: 1.52 mm
IR-2424d: 38.100 mm | F: 44.450 mm | B: 38.48 mm | r: 1.52 mm
IR-2724d: 42.863 mm | F: 52.388 mm | B: 38.48 mm | r: 1.52 mm
IR-2824d: 44.450 mm | F: 52.388 mm | B: 38.48 mm | r: 1.52 mm
IR-2916d: 46.038 mm | F: 52.388 mm | B: 25.78 mm | r: 1.52 mm
IR-2924d: 46.038 mm | F: 52.388 mm | B: 38.48 mm | r: 1.52 mm
IR-3024d: 47.625 mm | F: 53.975 mm | B: 38.48 mm | r: 1.52 mm
IR-4016d: 63.500 mm | F: 69.850 mm | B: 25.78 mm | r: 1.52 mm

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