Spline Dimensions: flat_root
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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| flat_root | fr_10_10 | 0.866 | 0.3142 | 10/20 | side_fit | 1.1 | 1.1 | 0.85 | 0.9 | 2.54 | Pitch 10/20; D=N/P=10/10=1.000; Do=(N+1)/P=1.100; Dre=(N-1.5)/P=0.850; Di=(N-1)/P=0.900; Dri=(N+1)/P=1.100 | 10 | 1 | 25.4 | 30 | flat | 0.1571 |
| flat_root | fr_10_16 | 1.3856 | 0.3142 | 10/20 | side_fit | 1.7 | 1.7 | 1.45 | 1.5 | 2.54 | Pitch 10/20; D=1.600 | 16 | 1.6 | 40.64 | 30 | flat | 0.1571 |
| flat_root | fr_10_24 | 2.0785 | 0.3142 | 10/20 | side_fit | 2.5 | 2.5 | 2.25 | 2.3 | 2.54 | Pitch 10/20; D=2.400 | 24 | 2.4 | 60.96 | 30 | flat | 0.1571 |
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