Spline Gaging
Spline Plug Gages
Involute, helical, straight-sided and serration plug gages
Plug gages for inspecting internal splines — the broached or shaped form inside a hub, gear or coupling. Built to your print, with traceable certification included.
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Spline plug gages inspect an internal spline — the broached or shaped form inside a hub, gear, coupling or shaft bore. A composite plug checks the effective fit of the whole form at once, which is what determines whether the mating shaft will actually assemble.
Spline forms we supply
- Involute — the curved-flank form used in most power-transmission splines.
- Helical — an involute form cut at a helix angle.
- Straight-sided — parallel flanks, common in older and heavy-duty designs.
- Serration — fine-pitch vee form for shallow, high-count applications.
Made to your print
Spline gages are made to order from your specification — number of teeth, pitch, pressure angle, class of fit and length of engagement. Send a print or the spline data and we will quote the gage. Final inspection is completed in an environmentally controlled ISO/IEC 17025 accredited laboratory. Ring gages for the mating external spline are on the Spline Ring Gages page.