The JBO Thread Plug Gauge is a precision tool for quickly verifying UNF threaded holes. Sized for UNF 1 x 12 in a left-hand configuration and classified to 2B, this go/no-go gauge helps ensure threads meet the required specifications with repeatable accuracy. It’s designed for use on shop floors across manufacturing, automotive, and aerospace environments, making it easy for engineers, inspectors, and technicians to confirm proper fit and function in one quick test.

• Fast go/no-go verification: Quickly determine if a hole meets spec by testing against clean go/no-go limits, speeding inspections and reducing guesswork during assembly.
• Left-hand UNF 1 x 12, 2B precision: Precisely matched to left-hand UNF threads in 1 x 12 with 2B tolerance to deliver consistent measurements across parts and setups.
• Durable, reliable design: Meticulous dimensions and robust construction provide repeatable, dependable readings on every part, supporting high-throughput quality checks.

This gauge helps you cut inspection time, reduce rework, and ensure every threaded hole is ready for assembly. By offering clear pass/fail results, it supports faster decision-making, tighter quality control, and greater peace of mind on critical components—whether you’re building engines, chassis, or aerospace assemblies.