The JBO Thread Plug Gauge is a precision Go/No-Go tool designed for metric fine threads. This left-hand model is sized for M16 x 0.5 holes, helping technicians, engineers, and quality teams quickly verify that threaded holes will accept the correct components. The Go/No-Go design provides fast, objective pass/fail checks that reduce guesswork during assembly and inspection.

Built for durability in busy workshops, the gauge uses hardened steel to resist wear and maintain accuracy over many uses. The 6H tolerance specification ensures consistent results with the corresponding thread standard, supporting reliable fits across production runs and maintenance tasks.

• Go/No-Go quick checks: Quickly determine whether a threaded hole meets the required size and tolerance, speeding up inspections and reducing downtime.
• Hardened steel construction: Resists wear and keeps readings stable over thousands of uses, ensuring long-term reliability in busy environments.
• Metric fine threading (M16 x 0.5) with 6H, Left-Hand design: Precisely sized for the intended thread, including left-hand applications, to deliver consistent, trustworthy fit verification.

This gauge helps you confirm hole readiness in seconds, reduces guesswork and rework, and supports consistent quality across assemblies. Its durable build and precise sizing provide dependable results for manufacturing, maintenance, and engineering workflows, giving you confidence to buy and keep operations moving smoothly.