JBO Thread Plug Gauge — UNF Go-No-Go, Left-Hand, 2B, 1/2 x 20 — is a precision measurement tool for quickly checking UNF threaded holes. Whether you’re an engineer, buyer, tradesperson, hobbyist, or maintenance technician, this gauge helps confirm correct thread fit and seating with fast, reliable pass/fail indications.

The go/no-go design provides instant acceptance testing, so you can move from inspection to production with confidence. The robust metal build and knurled grip ensure comfortable handling in busy shops.

• Go/No-Go Quick Check: Instantly determine whether the thread is within tolerance with a single insertion test, reducing inspection time and rework.
• UNF Left-Hand, 1/2 x 20, 2B Precision: Machined to the 2B tolerance class for consistent measurements across parts and batches, ensuring reliable checks of UNF threads.
• Rugged, Knurled Construction: Durable metal body with a textured grip for secure handling and precise alignment in demanding environments.

By delivering fast, repeatable thread verification, this gauge helps you speed up production, improve consistency, and reduce errors in assembly and maintenance tasks. It’s a trusted, straightforward tool that supports accurate fittings and long-term reliability for a wide range of threaded components.