The JBO Plug Gauge for UNC (STI) right-hand threads is a class 3B plug gauge sized for 5/16 x 24 UNC screw thread inserts. Calibrated to DAkkS standards, this gauge provides traceable, high-precision measurements essential for quality control in manufacturing, automotive, and aerospace environments.

Designed to verify pitch diameter with clarity and speed, it helps you confirm the correct fit and reliable performance of threaded inserts across production and inspection workflows. Its robust construction supports daily use on the shop floor, while its precise dimensions ensure consistent results aligned with UNC STI specifications.

• UNC (STI) pitch-diameter verification: Enables precise measurement of pitch diameter for reliable insert fit and smooth engagement during assembly, reducing misfits and returns.
• DAkkS-calibrated, traceable accuracy: Provides certified, auditable measurement results that integrate with quality systems and ISO 17025 compliance.
• Durable, right-hand 3B design: Built for daily use with a rugged knurled body and sturdy ends, delivering consistent performance with minimal maintenance.

Whether you’re validating new batches or performing routine QA, this gauge streamlines inspections, shortens setup times, and helps you maintain tight tolerances across your threaded-insert applications.