The JBO Thread Plug Gauge is a precision go-no-go tool designed to verify 3/8 x 20 BSF threaded holes with accuracy and speed. Built for engineers, machinists, inspectors, and maintenance teams, this Right-Hand, Medium Class gauge helps confirm threads meet specification before assembly or tapping operations.

With its two ends serving as quick pass/fail indicators, it reduces guesswork, speeds setup, and helps prevent misfits and costly rework on the line.

• Go/No-Go Quick Validation: Instantly confirms whether the hole size meets the 3/8 x 20 BSF specification, enabling on-the-spot acceptance or rejection and reducing inspection time.
• Right-Hand, Medium Class Precision: Tailored for right‑hand threads with consistent medium-class tolerance to deliver repeatable results across production runs.
• Durable Knurled Construction for Easy Handling: Knurled grip and robust end fittings provide secure handling in busy environments and withstand repeated use.

By using this gauge, you tighten quality control, shorten setup times, and ensure reliable thread engagement in final assemblies. The clear go/no-go signals empower operators to move quickly with confidence, delivering consistent, high-quality results across manufacturing, maintenance, and repair tasks.