The JBO Plug Gauge - UNC (STI) Heli Coil Gauge is a right-hand plug gauge designed for UNC (Unified National Coarse) screw thread inserts (STIs). It is tailored for inspecting UNC STI wire inserts, enabling precise pitch-diameter checks to confirm proper fit and function. This gauge is widely used in manufacturing, automotive, and aerospace industries to ensure inserts meet UNC STI specifications.

Calibrated to DAkkS standards and manufactured in accordance with ANSI/ASME thread specifications, this gauge delivers traceable, repeatable measurements you can rely on. The meticulous design and precise dimensions support consistent acceptance testing on the shop floor or in the quality lab.

• UNC (STI) compatibility and pitch-diameter verification: Designed specifically for UNC STI wire inserts, enabling accurate pitch-diameter measurement to verify proper fit and performance.
• DAkkS calibration and ANSI/ASME compliance: Calibrated to DAkkS standards with ANSI/ASME thread specifications, ensuring traceable accuracy and reliable results across audits and quality checks.
• Right-hand, 3/8 x 16 size: Right-hand gauge sized for 3/8 x 16 UNC inserts, providing straightforward, field-friendly inspection on standard components.

Using this gauge sharpens your quality control by delivering quick, dependable pitch-diameter readings, helping you catch mismatches before assembly and reduce rework. The DAkkS-calibrated, ANSI/ASME-compliant design gives you confidence in your measurement records for audits and supplier qualifications, while the compact, proven design integrates smoothly into routine inspection workflows on manufacturing lines, maintenance bays, and repair shops.