BEARINGDEX
Deep groove ball, thin section

6908 bearing

40 mm bore, 62 mm outside diameter, 12 mm width (1.5748 × 2.4409 × 0.4724 in). SKF numbers it 61908.

Cross-reference 6908Decode a full part number

Dimensions

mminch
Bore d401.5748
Outside diameter D622.4409
Width B120.4724

Quick numbers

Pitch diameter dm51.0 mm
Section height (D − d)/211.0 mm
n·dm at 1,800 rpm91,800
n·dm at 3,600 rpm183,600

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.
08Bore code 08 × 5 = 40 mm

How each brand writes it

Same bearing, every maker's notation
VersionSKFFAGNSKNTNKoyoNACHI
Open6190869086908690869086908
Shields both sides61908-2Z6908-2ZR6908ZZ6908ZZ6908ZZ6908ZZE
Contact seals both sides61908-2RSH6908-2RSR6908DDU6908LLU6908-2RS6908-2NSE
Contact seals both sides, C361908-2RSH/C36908-2RSR-C36908DDUC36908LLUC36908-2RSC36908-2NSE C3 Verify
Non-contact seals both sides61908-2RSL6908-2BRS Verify6908VV6908LLB6908-2RU Verify6908-2NKE Verify
Shields both sides, C361908-2Z/C36908-2ZR-C36908ZZC36908ZZC36908ZZC36908ZZE C3 Verify