Spline Gages

About

Wherever a splined shaft transmits torque or locates a mating part, Go/No-Go inspection is mandatory — and WESTport designs, manufactures, laps, and certifies spline gages for every major profile in-house. We build to both actual and effective tolerance requirements, for internal and external splines, across involute, straight-sided, helical, angular, parallel, and serration forms. Every gage is finished by hand and certified in our ISO/IEC 17025 accredited laboratory with NIST-traceable documentation. The WESTport spline gage line Spline gaging comes down to three questions: internal or external, pass/fail or variable data, and which profile. This collection covers all three. Involute Spline Plug Gage — Go/No-Go Set. Checks internal splined bores for composite error, tooth form, pitch, and effective/actual size. The Go member verifies full-form (effective) fit; the No-Go checks individual space width. Straight-Sided & Serration Spline Plug Gage. Go/No-Go plug gaging for straight-sided and serration internal forms where involute profiles don't apply. Helical Spline Plug Gage. Internal gaging for helical splines, built to your helix angle and hand. Involute Spline Ring Gage — Go/No-Go. Inspects external splined shafts for full-form composite error and functional diameter. Compatible with taper master plug gages for setup. Variable (Indicating) Spline Gage Set. Combines a Go plug or ring with a measuring insert and setting master to read actual space width or tooth thickness — variable data, not just pass/fail, with SPC output available. Taper Master Plug Gage. The setting master used to zero and verify ring and indicating gages, ensuring your whole spline gaging system traces to a common standard. What spline gages inspect Composite (effective) error Tooth form & profile Index / pitch Space width Tooth thickness Functional diameter Actual size Internal & external splines Plug vs. ring vs. indicating Which gage you need depends on whether you're inspecting

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