BEARINGDEX
Deep groove ball, thin section

6906 bearing

30 mm bore, 47 mm outside diameter, 9 mm width (1.1811 × 1.8504 × 0.3543 in). SKF numbers it 61906.

Cross-reference 6906Decode a full part number

Dimensions

mminch
Bore d301.1811
Outside diameter D471.8504
Width B90.3543

Quick numbers

Pitch diameter dm38.5 mm
Section height (D − d)/28.5 mm
n·dm at 1,800 rpm69,300
n·dm at 3,600 rpm138,600

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.
06Bore code 06 × 5 = 30 mm

How each brand writes it

Same bearing, every maker's notation
VersionSKFFAGNSKNTNKoyoNACHI
Open6190669066906690669066906
Shields both sides61906-2Z6906-2ZR6906ZZ6906ZZ6906ZZ6906ZZE
Contact seals both sides61906-2RSH6906-2RSR6906DDU6906LLU6906-2RS6906-2NSE
Contact seals both sides, C361906-2RSH/C36906-2RSR-C36906DDUC36906LLUC36906-2RSC36906-2NSE C3 Verify
Non-contact seals both sides61906-2RSL6906-2BRS Verify6906VV6906LLB6906-2RU Verify6906-2NKE Verify
Shields both sides, C361906-2Z/C36906-2ZR-C36906ZZC36906ZZC36906ZZC36906ZZE C3 Verify