The Anti Friction Bearing Manufacturers Association have a code system which identifies bearings by type, size and construction. Any bearing supply house or bearing manufacturer can identify their bearings from such code numbers. The following tabulation shows those codes which most commonly apply to bearings in U.S. MOTORS® products.

AFBMA Code System For Bearings
000 Bore	AAA Type	OO Width & O.D.	AAAA Cage. Shields or Seals & Modifications	0 Internal Fit Up
Code	Space No.	Common Symbols	Description
Bore	1, 2, 3	17 or 105	Inside diameter of bearing in m.m. refer to bearing catalog
Type	1, 2, 3	BC BL BD BF	Ball bearing, single row, radial, non-filling slot Ball bearing, single row, radial, filling slot Ball bearing, double row, radial, non-filling slot Ball bearing, double row, radial, filling slot
Width & O.D.	1, 2	00 02 03 04	6000 series bearing 6200 series bearing 6300 series bearing 6400 series bearing
Cage shields or seals modification	1, 2, 3	X P S G	Manufacturer a standard bearing cage Metal shield permanently fastened Contact seal permanently fastened Snap ring groove on O.D. with snap ring
Internal Fit Up	1	3	Internal clearance greater than standard

Example:
50BC02 - Single row, radial, non-filling slot ball bearing with 50 mm bore and a 6200 series O.D. and width. The SKF number would be 6210.

75BC03XP - Single row, radial, non-filling slot ball bearing with 75 mm bore, a 6300 series O.D. and width, manufacturer's standard bearing cage and one shield. The SKF number would be 63152.

35BC02XSS3 - Single row, radial, non-filling slot ball bearing with 35 mm bore, a 6200 series O.D. and width, manufacturer's standard bearing cage, 2 seals and an internal clearance greater than standard. The SKF number would be 62072RS/C3.