| HMX EXTRA CAPACITY SERIES  Attention: Subject to price & availability of Heim brand bearings, equivalent bearings may be furnished.Outer Member: 4130 or 4340 Alloy steel, heat treated, magnetic particle inspected, with protective coating for corrosion resistance.Ball: SAE 52100 Steel, Heat Treated, Chrome Plated. Inserts: Copper Alloy  |