• Ball Quality

    2013-12-29


    Ball quality is defined as follows:

    Surface Hardness is measured on the Rockwell Scale. Minimum hardness is RC 60 for carbon, chrome and 440 stainless balls and varies for other products according to the material and desired toughness.
    Case Depth is the radial distance from the ball surface to the point where hardness falls to Rockwell C 50. The core is the remaining soft inner area (avalible in carbon steel ball).
    Surface Integrity is defined as the surface smoothness and freedom from defects such as flats, pits, soft spots and cuts. Balls must be free of such defects when inspected without magnification.
    Size is the mean diameter, measured between two parallel planes on the ball surface.
    Sphericity is defined as the deviation from a true spherical form (out-of-round condition).

    Standard

    Grade

    Ball diameter variable

    Spherical error

    Batch diameter variation

    Surface roughness

    G5

    0.13

    0.13

    0.25

    0.014

    G10

    0.25

    0.25

    0.5

    0.020

    G16

    0.4

    0.4

    0.8

    0.025

    G20

    0.5

    0.5

    1

    0.032

    G24

    0.6

    0.6

    1.2

    0.040

    G28

    0.7

    0.7

    1.4

    0.050

    G40

    1

    1

    2

    0.060

    G60

    1.5

    1.5

    3

    0.080

    G100

    2.5

    2.5

    5

    0.100

    G200

    5

    5

    10

    0.150

    G500

    12.5

    12.5

    25

    G1000

    25

    25

    50





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