Technical Downloads

Our 80th-anniversary brochure: company overview, product specifications, machining and inspection capabilities, U.S. Tsubaki chain and sprockets, and the industries we serve.

The gears, sprockets, splines and machining services we offer, with the size and pitch range for each product, for your approved-supplier file.

Rules and formulas for spur gears: diametral pitch, module, pitch and outside diameter, standard tooth proportions, center distance and base pitch.

Formulas for helical gears: normal and transverse pitch and pressure angle, helix angle, lead, pitch and outside diameter, and operating center distance.

Formulas for worms and worm wheels: axial and normal pitch, lead and helix angle, pitch and throat diameters, center distance and ratio.

Formulas for 30° pressure-angle involute splines and serrations: diametral pitch, pitch diameter, and outer and internal diameters.

Standard SAE parallel key spline proportions for 4, 6, 10 and 16 keys, in A (permanent), B (slide, not under load) and C (slide under load) fits.

A glossary of the gear symbols used in our formula sheets, from addendum and backlash to helix angle, pressure angle and quality number.

Our gear department’s standard inspection and testing procedures for spur, helical, bevel, worm and internal gears, sprockets, racks and splines.