Tolerances Knurled Outside Diameters

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Tolerances Knurled Outside Diameters

Tolerances, Engineering Design & Limits & Fits

Recommended Tolerances on Knurled Outside Diameters per. ANSI ASME B94.6

Tolerance Class	Diametral Pitch
	64	96	128	160	64	96	128	160
	Tolerance on Knurled Outside Diameter				Tolerance on Work-Blank Diameter Before Knurling
I	+ 0.005 − 0.012	+ 0.004 − 0.010	+ 0.003 − 0.008	+ 0.002 − 0.006	± 0.0015	± 0.0010	± 0.0007	± 0.0005
II	+ 0.000 − 0.010	+ 0.000 − 0.009	+ 0.000 − 0.008	+ 0.000 − 0.006	± 0.0015	± 0.0010	± 0.0007	± 0.0005
III	+ 0.000 − 0.006	+ 0.000 − 0.005	+ 0.000 − 0.004	+ 0.0000 − 0.003	+ 0.0000 − 0.0015	+ 0.0000 − 0.0010	+ 0.000 − 0.0007	+ 0.0000 − 0.0005

Class I: Tolerances in this classification may be applied to straight, diagonal and raised diamond knurling where the knurled outside diameter of the work need not be held to close dimensional tolerances. Such applications include knurling for decorative effect, grip on thumb screws, and inserts for moldings and castings.
Class II: Tolerances in this classification may be applied to straight knurling only and are recommended for applications requiring closer dimensional control of the knurled outside diameter than provided for by Class I tolerances.
Class III: Tolerances in this classification may be applied to straight knurling only and are recommended for applications requiring closest possible dimensional control of the knurled outside diameter. Such applications include knurling for close fits.

Note: The width of the knurling should not exceed the diameter of the blank, and knurling wider than the knurling tool cannot be produced unless the knurl starts at the end of the work.

Reference:

ASME B94.6 R2014 (1984)