Dimensioning Knurled Features Drawings

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Knurl Specification and Tool Size Chart

Knurls are dimensioned in accordance with ANSI B94.6 and are used to provide a rough surface for gripping, decoration, or for a press fit between mating parts. Types of knurls are diamond, straight and diagonal. Standard pitches are 64, 96, 128 and 160.

Decorative Knurls. Knurls for gripping or decorative purposes are called out by type, pitch, and axial length. See Figure 1. This is a Class I tolerance in accordance with ANSI B94.6 and may be applied to straight, diagonal and raised diamond knurling.

Decorative And Functional Knurls. For applications requiring closer dimensional control of the knurled outside diameter than provided by CLASS I tolerances. This is a CLASS II tolerance in accordance with ANSI B94.6 and applies to straight knurling only.

Functional Knurls. Knurls for press fits are called out by type, pitch, axial length, diameter before knurling, and should include the minimum diameter after knurling. See Figure 2. This is a Class III tolerance in accordance with ANSI B94.6 and applies to straight knurling only.

Kurl for Decorating or Gripping Class II & Class III Knurl for Pless Fit
Class I, Knurl for Decoration or Gripping Class II, CLass III Knurl for Press Fit
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