Spline Dimensions: major_dia_fit
Involute spline dimensions per ANSI B92.1-1970 (R1993) / 1996 — pitch diameter, major and minor diameters (external and internal), base circle diameter, circular pitch, and tooth thickness for 30-degree pressure angle splines across diametral pitches 2.5/5 through 20/40. Covers flat root side fit, fillet root side fit, and major diameter fit profiles.
| spline type | record id | base circle dia in (in) | circular pitch in (in) | diametral pitch | fit class | major dia ext in (in) | major dia int in (in) | minor dia ext in (in) | minor dia int in (in) | module equiv (mm) | notes | num teeth (count) | pitch dia in (in) | pitch dia mm (mm) | pressure angle deg (deg) | root type | tooth thickness in (in) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| major_dia_fit | mdf_10_16 | 1.3856 | 0.3142 | 10/20 | major_dia_fit | 1.7 | 1.7 | 1.45 | 1.5 | 2.54 | Major diameter fit 10/20 16T; tight fit for precision centering; used in machine tools and precision power transmission | 16 | 1.6 | 40.64 | 30 | flat | 0.1571 |
| major_dia_fit | mdf_12_24 | 1.7321 | 0.2618 | 12/24 | major_dia_fit | 2.0833 | 2.0833 | 1.875 | 1.9167 | 2.117 | Major diameter fit 12/24 24T | 24 | 2 | 50.8 | 30 | flat | 0.1309 |
| major_dia_fit | mdf_8_16 | 1.7321 | 0.3927 | 8/16 | major_dia_fit | 2.125 | 2.125 | 1.8125 | 1.875 | 3.175 | Major diameter fit — both mating parts controlled to major dia for very close concentricity; internal major dia controlled to tight tolerance; same basic dims as flat root side fit but different tolerance application | 16 | 2 | 50.8 | 30 | flat | 0.1963 |
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