BEARINGDEX
Deep groove ball, thin section

6901 bearing

12 mm bore, 24 mm outside diameter, 6 mm width (0.4724 × 0.9449 × 0.2362 in). SKF numbers it 61901.

Cross-reference 6901Decode a full part number

Dimensions

mminch
Bore d120.4724
Outside diameter D240.9449
Width B60.2362

Quick numbers

Pitch diameter dm18.0 mm
Section height (D − d)/26.0 mm
n·dm at 1,800 rpm32,400
n·dm at 3,600 rpm64,800

Compare against the maker's limiting speed. Speed calculator · L10 life

What the number means

6Deep groove ball, thin section
9Diameter series 9: very thin. Width series 0 is implied and left off.
01Bore code 01 is a fixed code for 12 mm

How each brand writes it

Same bearing, every maker's notation
VersionSKFFAGNSKNTNKoyoNACHI
Open6190169016901690169016901
Shields both sides61901-2Z6901-2ZR6901ZZ6901ZZ6901ZZ6901ZZE
Contact seals both sides61901-2RSH6901-2RSR6901DDU6901LLU6901-2RS6901-2NSE
Contact seals both sides, C361901-2RSH/C36901-2RSR-C36901DDUC36901LLUC36901-2RSC36901-2NSE C3 Verify
Non-contact seals both sides61901-2RSL6901-2BRS Verify6901VV6901LLB6901-2RU Verify6901-2NKE Verify
Shields both sides, C361901-2Z/C36901-2ZR-C36901ZZC36901ZZC36901ZZC36901ZZE C3 Verify