BEARINGDEX
Deep groove ball

6403 bearing

17 mm bore, 62 mm outside diameter, 17 mm width (0.6693 × 2.4409 × 0.6693 in).

Cross-reference 6403Decode a full part number

Dimensions

mminch
Bore d170.6693
Outside diameter D622.4409
Width B170.6693

Quick numbers

Pitch diameter dm39.5 mm
Section height (D − d)/222.5 mm
n·dm at 1,800 rpm71,100
n·dm at 3,600 rpm142,200

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.
03Bore code 03 is a fixed code for 17 mm

How each brand writes it

Same bearing, every maker's notation
VersionSKFFAGNSKNTNKoyoNACHI
Open640364036403640364036403
Shields both sides6403-2Z6403-2ZR6403ZZ6403ZZ6403ZZ6403ZZE
Contact seals both sides6403-2RSH6403-2RSR6403DDU6403LLU6403-2RS6403-2NSE
Contact seals both sides, C36403-2RSH/C36403-2RSR-C36403DDUC36403LLUC36403-2RSC36403-2NSE C3 Verify
Non-contact seals both sides6403-2RSL6403-2BRS Verify6403VV6403LLB6403-2RU Verify6403-2NKE Verify
Shields both sides, C36403-2Z/C36403-2ZR-C36403ZZC36403ZZC36403ZZC36403ZZE C3 Verify