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Tap Eccentricity Tolerances
USCTI Table 317:  Eccentricity Tolerances of Tap Elements
USCTI Table 317
Range of Sizes (Inclusive) Cut Threads Ground Threads
Tap Element
Inch & Machine Screw Pipe Metric Eccentricity *T.I.V. Eccentricity *T.I.V.
Square
at central point
#0 to 1/2 inch 1/16 to 1/8 inch M1.6 to M12 .0030 .0060 .0030 .0060
Over 1/2 to 4 inches 1/4 to 4 inches Over M12 to M100 .0040 .0080 .0040 .0080
Shank
#0 to 5/16 inch 1/16 inch M1.6 to M8 .0030 .0060 .0050 .0010
Over 5/16 to 4 inches 1/8 to 4 inches Over M8 to M100 .0040 .0080 .0008 .0016
Major Diameter
#0 to 5/16 inch 1/16 inch M1.6 to M8 .0025 .0050 .0005 .0010
Over 5/16 to 4 inches 1/8 to 4 inches Over M8 to M100 .0040 .0080 .0008 .0016
Pitch Diameter
at first full thread
#0 to 1/2 inch 1/16 inch M1.6 to M8 .0025 .0050 .0005 .0010
Over 1/2 to 4 inches 1/8 to 4 inches Over M8 to M100 .0040 .0080 .0008 .0016
Chamfer
#0 to 1/2 inch 1/16 to 1/8 inch M1.6 to M12 .0020 .0040 .0010 .0020
Over 1/2 to 4 inches 1/4 to 4 inches Over M12 to M100 .0030 .0060 .0015 .0030

  Compiled by United States Cutting Tool Institute

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