The JBO Thread Ring Gauge (NoGo) is a precision inspection tool designed to verify external BSP (G) threads. Sized for 1-3/4" diameter with 11 threads per inch, and configured for right-hand threads in Tol. A, it helps plumbers, pipefitters, engineers, and maintenance professionals quickly determine whether fittings meet BSP (G) standards. The NoGo design makes non-conforming threads easy to spot, supporting reliable seal and proper fit in critical piping and fluid-handling applications.

Built for daily workshop use, this gauge combines accurate machining with a durable finish to withstand busy environments. Its robust construction delivers repeatable checks over time, helping you speed up inspections, reduce guesswork, and avoid mismatches that can lead to leaks or downtime.

• Precise BSP (G) NoGo sizing: Quickly verify external BSP (G) threads at 1-3/4" x 11 TPI for right-hand threads (Tol. A), delivering a clear pass/fail to ensure proper fit and sealing.
• Rugged, corrosion‑resistant construction: Machined steel with a durable finish stands up to daily shop use, delivering consistent results and longer tool life.
• Intuitive Go/No-Go workflow with orientation aid: Simple checks that save time and improve accuracy, aided by a visible red indexing marker for quick alignment and repeatable inspections.

This gauge helps streamline your quality checks by providing a reliable, fast method to confirm BSP (G) thread conformity. It reduces downtime by catching mismatches early, supports consistent sealing performance across fittings, and helps teams standardize inspection routines, whether in the workshop or on-site.