BEARINGDEX
Deep groove ball

63/28 bearing

28 mm bore, 68 mm outside diameter, 18 mm width (1.1024 × 2.6772 × 0.7087 in).

Cross-reference 63/28Decode a full part number

Dimensions

mminch
Bore d281.1024
Outside diameter D682.6772
Width B180.7087

Quick numbers

Pitch diameter dm48.0 mm
Section height (D − d)/220.0 mm
n·dm at 1,800 rpm86,400
n·dm at 3,600 rpm172,800

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

What the number means

6Deep groove ball
3Diameter series 3: medium
/28Slash bore: 28 mm, written directly

How each brand writes it

Same bearing, every maker's notation
VersionSKFFAGNSKNTNKoyoNACHI
Open63/2863/2863/2863/2863/2863/28
Shields both sides63/28-2Z63/28-2ZR63/28ZZ63/28ZZ63/28ZZ63/28ZZE
Contact seals both sides63/28-2RSH63/28-2RSR63/28DDU63/28LLU63/28-2RS63/28-2NSE
Contact seals both sides, C363/28-2RSH/C363/28-2RSR-C363/28DDUC363/28LLUC363/28-2RSC363/28-2NSE C3 Verify
Non-contact seals both sides63/28-2RSL63/28-2BRS Verify63/28VV63/28LLB63/28-2RU Verify63/28-2NKE Verify
Shields both sides, C363/28-2Z/C363/28-2ZR-C363/28ZZC363/28ZZC363/28ZZC363/28ZZE C3 Verify