The JBO Thread Plug Gauge - UNJF Go-No/Go - Left Hand - 3B - 3/4 x 16 is a precision inspection tool designed to verify internal threads against Unified UNJF standards. It’s tailored for industries like manufacturing, automotive, and aerospace, helping you quickly confirm that threaded holes meet exact requirements for proper fit and function.

With dedicated go and no-go testing ends, this gauge delivers fast, decisive results—so you can approve good parts and catch non-conformances before they move to the next production step. Its left-hand design and 3B tolerance class support consistent, reliable inspections across production runs.

• Go/No-Go End for Quick Acceptance Testing: Test both minimum and maximum thread limits in seconds, enabling fast, decisive go/no-go decisions without guesswork.
• Left-Hand UNJF 3/4 x 16, 3B Spec: Specifically designed to match left-handed UNJF threads (3/4" diameter, 16 TPI) with Class 3B tolerance, ensuring accurate, repeatable conformance checks.
• Ergonomic, Durable Gauge Body: Knurled grip and robust ends provide secure handling in busy shop environments, delivering reliable performance through frequent inspections.

Using this gauge helps you streamline quality control, reduce rework, and maintain consistent thread inspection standards across parts and jobs. It supports faster throughput, clearer pass/fail decisions, and greater confidence that threaded components will fit and function as intended.