Date: 2013-08-01

Ball Bearing Steels: 440C vs. 52100 in a Corrosive Environment

(November 1st, 2010)

At Pacamor Kubar Bearings (PKB), we manufacture the vast majority of our miniature and instrument ball bearing rings from AISI 440C stainless steel, which is the standard material for most domestically manufactured miniature and instrument bearings for aerospace and medical applications. We also provide specially heat treated 440C for cryogenic applications or other extreme environments and occasionally manufacture ball bearings from other specialty steels.

There are some cases where customers ask for AISI 52100, a steel used in the bearing industry for many years but, in most cases has been replaced by 440C on newer drawing revisions and in new applications. The purpose of this blog is to offer some information about 440C as compared to 52100, particularly in corrosive environments.

According to

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Hot Products:

Product Model	Inside Diameter	Outside Diameter	Thickness
NU208 KOYO	40	80	18
NU1008 KOYO	40	68	15

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