SAE straight-side splines, 4, 6, 10 and 16 splines: major diameter D, spline width W and root diameter d (fit A) + example shaft STEP/STL

sizes

54 in table

Notes

• SAE straight-side (parallel-side) splines, the 4-, 6-, 10- and 16-spline series of SAE J499 / the older SAE spline fittings: parallel-sided splines of width W on a root cylinder d inside a major cylinder D. The numbers are Machinery's Handbook Tables 18 to 21 for fit A (permanent fit), external member, maximum values (D max, W max, d max); 4 splines 3/4 to 3 in, 6 splines 3/4 to 3 in, 10 splines 3/4 to 6 in, 16 splines 2 to 6 in. Each row follows its spline count's proportions to the printed rounding (checked on every row): 4 splines W = 0.241 D and d = 0.850 D; 6 splines W = 0.250 D, d = 0.900 D; 10 splines W = 0.156 D, d = 0.910 D; 16 splines W = 0.098 D, d = 0.910 D (the handbook's Table 22 gives these as formulas; its text could not be read in full, so the ratios here are read back from the table rows).
• Fits: the standard also gives fit B (to slide, no load) and, for 6 to 16 splines, fit C (to slide under load), with smaller d and wider clearances; the extraction of those columns was ambiguous, so only fit A is tabulated. The internal member (hub) values are not tabulated either. Tolerance: shafts 3/4 to 1-3/4 in are −0.001 in and 2 to 3 in −0.002 in on the major diameter (Engineers Edge note on the SAE table); the table values here are the maxima.
• Files: 14 example shaft sections, as one extruded solid: a root cylinder of Ø d with N parallel splines of width W out to Ø D, drawn from the maximum values; length equal to the major diameter (an example, not a standard length); no chamfers or corner radii. Radii at spline corners should not exceed 0.015 in and the spline should not be more than 0.006 in per foot out of parallel with the shaft axis (Machinery's Handbook text).
• Not on this page: torque ratings (the handbook prints them: for example 10 splines, 1 in nominal, 215 in-lb at fit A), fits B and C, the internal member, 5/8 in and smaller sizes. SAE J499 is sold by SAE and is linked, not reproduced.

SAE straight-side splines, 4, 6, 10 and 16 splines: major diameter… size chart

Mating features

Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Free files

★ Free files 14 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

Plain text: sheet.txt · JSON: /api/geometry?object=sae-straight-side-splines-4-6-10-16

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