Material

--The rings, balls, needles and rollers of WD bearings can be made of refining bearing steel AISI52100, stainless steel AISI440C, AISI420, etc.

--Cages are normally punch-pressed from brass strips H62 or steel strips 08, SPCC BQB402, as well as stainless steel strips AISI304, AISI302, fiber reinforced phenolic resin, plastics or copper stock, etc;

--Shields can be made of Japanese SPCC JISG3141 or stainless steel AISI304 or AISI302.

--Seals: synthetic rubber hot pressed with phosphatizing steel (AISI304 or AISI302 may used for stainless steel bearings) skeleton

The chemical composition of bearing steel and stainless steel are listed as follows:

Steel No.	C%	Si%	Mn%	S%	P%	Cr%
AISI52100	0.95-1.05	0.15-0.3	0.25-0.45	<0.025	<0.025	1.3-1.6
AISI440C	0.90-1.05	<0.8	<0.8	<0.04	<0.03	16-19

Material

WD Bearing Group