The JBO Thread Plug Gauge is a precision Go/No-Go tool designed to verify BSF threads in holes and housings. It’s ideal for manufacturers, maintenance teams, and technicians across automotive, aerospace, and general machining environments, helping you confirm thread accuracy quickly and reliably. The go/no-go design lets you identify conforming and non-conforming threads at a glance, reducing rework and ensuring proper fastener fit.
With two distinct ends for Go and No-Go checks, this gauge provides fast, repeatable measurements that keep quality checks moving on busy shop floors.

• Fast Go/No-Go verification: Quickly confirm whether a thread hole accepts the gauge or is out of tolerance, trimming inspection time and minimizing downtime on production lines.
• Rugged, precise construction: Hardened steel body with a durable finish and knurled grip stands up to daily use, cleaning, and handling while preserving measurement accuracy.
• BSF Right-Hand, Medium Class accuracy: Specifically sized 7/8 x 11 for right-hand BSF threads, ensuring consistent, repeatable measurements that align with standard components and batch quality.

Using the JBO BSF plug gauge helps streamline inspections, improve first-pass yields, and prevent costly reversions due to threaded mismatches. It supports dependable quality checks during incoming inspection, in-process assembly, and routine maintenance, empowering teams to make confident, fast decisions and keep operations running smoothly with reliable fastener fits.