BEARINGDEX
Deep groove ball

6405 bearing

25 mm bore, 80 mm outside diameter, 21 mm width (0.9843 × 3.1496 × 0.8268 in).

Cross-reference 6405Decode a full part number

Dimensions

mminch
Bore d250.9843
Outside diameter D803.1496
Width B210.8268

Quick numbers

Pitch diameter dm52.5 mm
Section height (D − d)/227.5 mm
n·dm at 1,800 rpm94,500
n·dm at 3,600 rpm189,000

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

What the number means

6Deep groove ball
4Diameter series 4: heavy. Width series 0 is implied and left off.
05Bore code 05 × 5 = 25 mm

How each brand writes it

Same bearing, every maker's notation
VersionSKFFAGNSKNTNKoyoNACHI
Open640564056405640564056405
Shields both sides6405-2Z6405-2ZR6405ZZ6405ZZ6405ZZ6405ZZE
Contact seals both sides6405-2RSH6405-2RSR6405DDU6405LLU6405-2RS6405-2NSE
Contact seals both sides, C36405-2RSH/C36405-2RSR-C36405DDUC36405LLUC36405-2RSC36405-2NSE C3 Verify
Non-contact seals both sides6405-2RSL6405-2BRS Verify6405VV6405LLB6405-2RU Verify6405-2NKE Verify
Shields both sides, C36405-2Z/C36405-2ZR-C36405ZZC36405ZZC36405ZZC36405ZZE C3 Verify