Introducing the JBO Thread Plug Gauge — a precision instrument designed for metric fine threads. This Go/No-Go gauge makes quick, reliable inspection of internal threads straightforward, helping you verify that parts with M13 x 1 threads will assemble correctly. With a Right Hand orientation and 4H tolerance, it’s ideal for machine shops, QC labs, and field service where thread accuracy matters.

Built to withstand daily use, the gauge features hardened steel construction for long-lasting wear resistance. Its two-ended design lets you perform go/no-go checks with a single tool, speeding up setup and reducing inspection time without sacrificing accuracy.

• Two-Ended Go/No-Go Design: One end confirms the hole size is within tolerance (go) and the other detects oversize conditions (no-go), delivering fast, decisive pass/fail results.
• Metric Fine M13 x 1 with 4H Tolerance: Precisely matched to common metric threading standards, ensuring accurate verification for mating components and consistent assembly quality.
• Hardened Steel Construction: Built to endure daily use with high wear resistance, maintaining accuracy and extending the gauge’s service life.

Used across manufacturing, assembly, and maintenance workflows, this gauge helps you speed up inspections, reduce rework, and ensure reliable, repeatable results. Its rugged build and precise Go/No-Go design give you confidence that every check reflects true thread compatibility, contributing to smoother workflows and higher first-pass acceptance.