The JBO Thread Plug Gauge is a precision UNJF Go-No/Go tool designed to verify threaded holes to exact Unified Thread standards. Specifically oriented for right-handed threads, this 3B-class gauge in No. 12 x 28 size provides a reliable, quick check during manufacturing, assembly, and inspection across industries such as automotive, aerospace, and general machining.

With its go/no-go design, you can instantly confirm whether a hole meets specification: the go end should thread in smoothly to indicate acceptance, while the no-go end should not advance beyond the limit. This simplifies QC routines, reduces guesswork on the shop floor, and helps maintain consistent thread quality across lots.

• Go/No-Go verification for fast, reliable thread checks: Quickly determine conformance with a simple insertion test, minimizing inspection time and human error.
• UNJF Right-Hand, 3B class accuracy: Engineered to UNJF specifications, delivering repeatable results that align with compatible components and assemblies.
• Precise No. 12 x 28 size: Precisely sized to test holes of this specification, providing clear acceptance criteria and reducing misfits during assembly.

Designed for professionals who demand consistency, the JBO Thread Plug Gauge supports streamlined QC workflows, reduces rework from incorrect thread holes, and helps ensure reliable, interchange-ready parts across production runs.