New (4) 7/8" chrome steel bearing balls, grade 25, lot

New (4) 7/8" chrome steel bearing balls, grade 25, lot

.8750" Chrome Steel Ball Bearings
BRAND NEW lot of 4 chrome steel ball bearings. MADE IN THE USA. These balls are Grade 25. This means that they must be round or spherical within 25 millionths (.000025) of an inch . They are made of AISI 52100 Chrome Alloy Steel that offers high hardness and excellent resistance to wear and deformation. They have a tensile strength of 325,000 psi. This is the finest bearing quality steel. 52100 material is specified by precision bearing manufacturers where precise spherical and tolerance accuracy are required.