The JBO Thread Plug Gauge is a precision go-no-go tool designed to verify internal threads to UNS standards. Sized for 1 1/2 x 8 right-hand threads with a 2B tolerance, this gauge is a must-have for inspectors, machinists, and quality teams in manufacturing, automotive, and aerospace environments.

Its compact, dual-end design supports quick GO and NO-GO checks in a single step, helping you confirm hole readiness on the shop floor and reduce rework or delays caused by out-of-spec threads.

• Go/No-Go Quick Checks: Quickly confirm whether internal threads meet the Go and No-Go limits, speeding inspections, reducing guesswork, and lowering the risk of assembly delays.
• UNS 1 1/2 x 8 Right-Hand, 2B Tolerance: Precisely matched to standard UNS thread specifications for this size, ensuring consistent fit and reliable part-to-part accuracy across batches.
• Durable, Ergonomic Construction: Knurled, non-slip grip and precision-machined ends provide secure handling and repeatable measurements even in busy workshop environments.

With the JBO Thread Plug Gauge, you gain dependable, straightforward thread verification that supports faster quality checks, tighter process control, and more consistent results across your manufacturing or maintenance workflows.