The JBO UNF (STI) plug gauge is a precision tool designed to verify UNF thread inserts (Helicoil style). It helps engineers, machinists, inspectors, and maintenance teams ensure UNF STI inserts will thread smoothly and perform reliably in critical assemblies. Calibrated to DAkkS traceability and aligned with ANSI/ASME thread standards, this right-hand gauge provides a trusted reference for quality control across manufacturing, automotive, and aerospace applications.

• Calibrated with DAkkS traceability: Provides accurate, auditable measurements that support quality records and compliance for UNF STI inserts.
• Direct pitch-diameter verification: Enables quick checks of insert fit (5/8 x 18 UNF), reducing guesswork and rework by confirming proper engagement.
• Durable, user-friendly design: Rugged construction with a grippy knurled body ensures repeatable readings in busy environments and long tool life.

Using the JBO UNF (STI) plug gauge speeds up inspections, minimizes installation issues, and helps maintain consistent performance across production lines. The DAkkS-calibrated reference supports audits and supplier qualifications, while the sturdy design keeps readings stable and reliable through daily shop-floor use.