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Pi Tape® brand Precision O-Ring Inside Diameter tapes are specifically designed to achieve quick, accurate inside diameter measurements of O-Rings and other soft-walled parts.
Tapes with a starting point of 2” (50.8mm) are made 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, Blue Or White Easy to Read is .005" (0.13mm) and for Stainless Steel is .006” (0.15mm).
Tapes with a starting point of 12” (300mm) are made 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) all material is .010” (0.25mm).