The JBO Thread Plug Gauge is a precision go/no-go gauge designed to verify UNC threaded holes across a range of parts and assemblies. Built for technicians, inspectors, engineers, buyers, tradespeople, and hobbyists, it delivers fast, reliable checks that confirm holes conform to Unified Thread Standards. With its go/no-go design, you can quickly identify conforming and non-conforming threads, ensuring proper fit and function.

Designed for Right-Hand UNC threads in size 1-8 with class 3B tolerance, this gauge provides precise, repeatable results on every inspection. Its robust construction and accurate dimensions support reliable measurements in manufacturing, automotive, and aerospace environments, while the compact form fits easily into tool kits and inspection benches. Perfect for incoming QA, in-process checks, and routine maintenance tasks.

• Go/No-Go quick verification: Enables instant pass/fail decisions for threaded holes, speeding inspections and reducing rework by clearly showing conforming versus non-conforming threads.
• UNC 1-8 Right-Hand, 3B tolerance: Delivers precise dimensional control that ensures consistent hole acceptance criteria across parts and orders, improving quality consistency.
• Durable, user-friendly construction: Knurled, corrosion-resistant body with robust metal ends provides secure handling, long life, and reliable performance in busy shop environments.

Using it streamlines QA workflows: a single glance confirms hole acceptance, reducing test time per part and lowering scrap rates. The repeatable UNC 1-8 Right-Hand, 3B tolerances ensure consistent results across operators and shifts, while the durable construction stands up to oil, coolant, and wear in daily production environments.