A homogenous spherical body, a series of which provides the rolling elements in a bearing, ball (as modified). The item is designed primarily to alleviate friction. It may have other usages such as the checking component in a ball-type check valve. Excludes:ball,check; ball,valve,ported.
3.9985 inches minimum and 4.0015 inches maximum rolling element diameter, afbma std tolerance for balls, grade 300 standard tolerance designation