The JBO Thread Plug Gauge is a UNEF Go-No/Go left-hand thread gauge designed to verify threaded holes against Unified thread standards. It's ideal for manufacturers, automotive shops, aerospace maintenance, and workshops where fast, reliable thread inspection matters. Its precise design supports accurate measurements of left-hand threads, helping ensure every hole accepts the correct fastener and functions as intended.

With a go/no-go design and exact dimensions, this gauge lets inspectors quickly identify conforming versus non-conforming threads, reducing guesswork and rework while speeding up quality checks on production lines.

• Go-No-Go Verification for Fast Pass/Fail: Enables quick, unambiguous assessment of thread acceptance, speeding inspections and reducing downtime.
• Specifically Matched to UNEF Left-Hand Threads: Precisely sized for 5/16 x 32 with a 2B class, ensuring reliable measurements for left-hand holes and assemblies.
• Rugged, User-Friendly Construction: Knurled grip and durable metal ends provide comfortable handling and long-lasting use in busy shop environments.

Using this gauge helps you maintain consistent results, reduce rework, and keep production moving by catching mismatched threads early during QC and ensuring proper fitment before assembly.