Machinery's Handbook, 31st Edition
Involute Splines 2343 Table 6. Spline Terms, Symbols, and Drawing Data, 30-Degree Pressure Angle, Flat Root Side Fit ANSI B92.1-1996
30-Deg Pressure Angle
Space Width (Circular) s = Actual s v = Effective
Tooth Thickness (Circular) t = Actual t v = Effective
Circular Pitch p
Fillet
Internal Spline
Form Clearance C F
C F
Optional
Major Dia.
D o
D ri
External Spline
Minor Dia.
Pitch Dia. D Ref
D i
D re
Form Dia.
D Fe
D Fi
The fit shown is used in restricted areas (as with tubular parts with wall thickness too small to permit use of fillet roots, and to allow hobbing closer to shoulders, etc.) and for economy (when hobbing, shaping, etc., and using shorter broaches for the internal member). Press fits are not tabulated because their design depends on the degree of tightness desired and must allow for such factors as the shape of the blank, wall thickness, material, hardness, thermal expansion, etc. Close tolerances or selective size grouping may be required to limit fit variations. Drawing Data Internal Involute Spline Data External Involute Spline Data Flat Root Side Fit Flat Root Side Fit Number of Teeth xx Number of Teeth xx Pitch xx/xx Pitch xx/xx Pressure Angle 30 ° Pressure Angle 30 ° Base Diameter x.xxxxxx Ref Base Diameter x.xxxxxx Ref Pitch Diameter x.xxxxxx Ref Pitch Diameter x.xxxxxx Ref Major Diameter x.xxx max Major Diameter x.xxx/x.xxx Form Diameter x.xxx Form Diameter x.xxx Minor Diameter x.xxx/x.xxx Minor Diameter x.xxx min Circular Space Width Circular Tooth Thickness Max Actual x.xxxx Max Effective x.xxxx Min Effective x.xxxx Min Actual x.xxxx The following information may be added as required: The following information may be added as required: Max Measurement Between Pins x.xxx Ref Min Measurement Over Pins x.xxxx Ref Pin Diameter x.xxxx Pin Diameter x.xxxx The above drawing data are required for the spline specifications. The standard system is shown; for alternate systems, see Table 5. Number of x’s indicates number of decimal places normally used.
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