BEARINGDEX
Deep groove ball, miniature

628 bearing

8 mm bore, 24 mm outside diameter, 8 mm width (0.315 × 0.9449 × 0.315 in).

Cross-reference 628Decode a full part number

Dimensions

mminch
Bore d80.3150
Outside diameter D240.9449
Width B80.3150

Quick numbers

Pitch diameter dm16.0 mm
Section height (D − d)/28.0 mm
n·dm at 1,800 rpm28,800
n·dm at 3,600 rpm57,600

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

What the number means

6Deep groove ball
2Diameter series 2: light
8Single digit: bore is 8 mm, written directly

How each brand writes it

Same bearing, every maker's notation
VersionSKFFAGNSKNTNKoyoNACHI
Open628628628628628628
Shields both sides628-2Z628-2ZR628ZZ628ZZ628ZZ628ZZE
Contact seals both sides628-2RSH628-2RSR628DDU628LLU628-2RS628-2NSE
Contact seals both sides, C3628-2RSH/C3628-2RSR-C3628DDUC3628LLUC3628-2RSC3628-2NSE C3 Verify
Non-contact seals both sides628-2RSL628-2BRS Verify628VV628LLB628-2RU Verify628-2NKE Verify
Shields both sides, C3628-2Z/C3628-2ZR-C3628ZZC3628ZZC3628ZZC3628ZZE C3 Verify