BEARINGDEX
Deep groove ball

6004 bearing

20 mm bore, 42 mm outside diameter, 12 mm width (0.7874 × 1.6535 × 0.4724 in).

Cross-reference 6004Decode a full part number

Dimensions

mminch
Bore d200.7874
Outside diameter D421.6535
Width B120.4724

Quick numbers

Pitch diameter dm31.0 mm
Section height (D − d)/211.0 mm
n·dm at 1,800 rpm55,800
n·dm at 3,600 rpm111,600

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

What the number means

6Deep groove ball
0Diameter series 0: extra light. Width series 0 is implied and left off.
04Bore code 04 × 5 = 20 mm

How each brand writes it

Same bearing, every maker's notation
VersionSKFFAGNSKNTNKoyoNACHI
Open600460046004600460046004
Shields both sides6004-2Z6004-2ZR6004ZZ6004ZZ6004ZZ6004ZZE
Contact seals both sides6004-2RSH6004-2RSR6004DDU6004LLU6004-2RS6004-2NSE
Contact seals both sides, C36004-2RSH/C36004-2RSR-C36004DDUC36004LLUC36004-2RSC36004-2NSE C3 Verify
Non-contact seals both sides6004-2RSL6004-2BRS Verify6004VV6004LLB6004-2RU Verify6004-2NKE Verify
Shields both sides, C36004-2Z/C36004-2ZR-C36004ZZC36004ZZC36004ZZC36004ZZE C3 Verify