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Accurately measure O-ring inside diameters with precision tapes designed for consistent and reliable results.
80 Years of Excellence: Trusted by aerospace, defense, and manufacturing since 1944
ISO/IEC 17025 Accredited: A2LA certified calibration ensures the highest quality standards
Proudly Made in USA: Manufactured in Tyler, Texas with American craftsmanship
** Standard tapes with a starting point of 2″ (50.8mm) are manufactured with a 1/4″ (6.35mm) wide Gage Member and a 1/2″ (12.7mm) wide Vernier Section.
The standard thickness for 1/4″ X 1/2″ (6.35mm X 12.7mm) in Spring Steel or Blue Easy to Read is .005″ (0.13mm) and for Stainless Steel is .006″ (0.15mm).
Standard tapes with a starting point of 12″ (300mm) are manufactured with a 3/8″ (9.53mm) wide Gage Member and a 3/4″ (19.05mm) wide Vernier Section.
The standard thickness for 3/8 X 3/4″ (9.53mm X 19.05mm) in all materials is .010″ (0.25mm).
For specialty sizes, widths and larger tapes, please contact us at [email protected].
Prices subject to change without notice.
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For over 80 years, our precision measuring instruments have been trusted by aerospace, defense, automotive, and industrial leaders worldwide.
Product Comprehensive guide for proper use and maintenance of your Pi Tape® measuring instrument.
Watch our instructional video for step-by-step measurement techniques.
Download the current pricing information for standard and custom-made precision circumference tapes.
Custom Made Tapes Available
Need a diameter larger than our listed standard sizes? Pi Tape® precision tapes can be manufactured to accommodate extended diameter ranges for specialized applications.
Custom diameters are available upon request and built to the same exacting standards of accuracy, durability, and traceability as our standard models.
If your required diameter exceeds the specifications shown above, download the price list for reference and submit a request for a custom quotation.
To request a quote or place an order:
Not all measurement needs are standard. Our Made-to-Order Precision Tapes are crafted to your exact specifications, ensuring accuracy and reliability for specialized applications.
Choose your size, scale, and material, and receive a tape built specifically for your project—backed by the same Pi Tape®® quality and calibration standards you trust.
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