The WESTport taper master plug gage is the setting master used to zero and verify spline ring and indicating gages, ensuring your entire spline gaging system traces to a common standard.

Consistent setup, traceable results

Used to establish the reference for spline ring gages and indicating sets, so every measurement across your shop starts from the same verified zero.

Certification & quality

• Designed, ground, and hand lapped in-house for accuracy and long service life
• Certificate of Accuracy, NIST-traceable — included with every gage
• Certified to ISO/IEC 17025; Long Form Certification available on a 5–7 business day turnaround

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