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    Steel Balls Are Supplied To You From HRT Steel Ball

    Welcome to HRT Precision Steel Ball.We are your Precision Ball Specialists!

    HRT Steel Ball can provide balls in any size in any machinable material to meet your requirements. Small or large quantities of uncommon sizes, materials, and tolerances are our specialty. Listed below are a few examples of materials we can produce to your specification.
    No Minimum charge or order. We ship worldwide!

    Glossary of Ball Terms

    Grade
    The ball grade (G) is a specific combination of dimensional, form, surface roughness and sorting tolerance for balls. For example, the level of sphericity, expressed in millionths of an inch, e.g., a Grade 10 ball must be round or spherical within 10 millionths of an inch. The grade designation also dictates the other tolerances, per the chart shown below. Click here for a link to our ball grades page.

    Variation of Ball Diameter (VDws)
    Tthe difference between the largest and the smallest of the single diameters of a ball.

    Variation of Ball Lot Diameter (VDwL)
    The difference between the mean diameters of the largest ball and smallest ball in a ball lot.

    Ball Lot
    Definite quantity of balls manufactured under conditions presumed uniform and which is considered as an entity.

    Deviation from Spherical Form
    The difference between the largest and smallest diameters measurable on a single ball. Also referred to as roundness or sphericity.

    Surface Roughness (Ra)
    Surface irregularities with relatively small spacings, which usually include irregularities resulting from the method of manufacture being used and/or other influences.

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