The JBO Thread Plug Gauge is a precision go/no-go tool designed to verify UNJF threads in holes and fittings. Built for right-hand 3B threads in the 3/8 x 24 size, this gauge helps machinists, inspectors, and maintenance professionals quickly confirm that threaded holes conform to exact UNJF specifications. Its dual-ended design provides an immediate pass/fail indication, so you can move on with confidence and reduce rework.

• Dual-ended Go/No-Go design: Quickly verify both minimum (go) and maximum (no-go) limits of the UNJF thread, delivering a clear pass or fail in seconds.
• Precise UNJF 3/8 x 24 Right-Hand 3B tolerance: Engineered to exact UNJF threading standards so measurements reflect true hole condition and ensure reliable fits.
• Durable, user-friendly construction: Knurled body and robust end interfaces provide secure grip, repeatable results, and long service life in busy shops.

Using this gauge streamlines quality control by converting complex thread measurement into fast, repeatable checks. It helps you minimize downtime, reduce scrap, and ensure consistent performance across parts and assemblies, whether you’re in manufacturing, automotive, or aerospace maintenance.