The JBO Thread Ring Gauge (GO) for UNF 1/4 x 28, Left Hand, 2A is a precision inspection tool designed to verify external thread diameters and pitch for components with UNF left-hand threads. It’s ideal for machinists, inspectors, maintenance crews, and quality-controlled production lines that require reliable conformance checks and fast pass/fail decisions on threaded parts.

Crafted from hardened steel, this GO gauge delivers exceptional durability and wear resistance in busy workshop environments. Its dedicated left-hand UNF configuration and 2A class are built to match exacting standards, while the ring design supports straightforward handling and quick identification of properly conforming components during setup, inspection, and incoming checks.

• Precise Go Gauging for UNF Left-Hand Threads: ensures accurate acceptance or rejection of parts by verifying that external threads meet the exact GO size for 1/4 x 28, reducing ambiguity in quality checks.
• Hardened Steel Construction: delivers lasting performance with excellent wear resistance, maintaining measurement accuracy over countless inspections.
• User-Friendly Inspection Workflow: designed for fast, intuitive use so your team can confirm conformance at a glance, speeding up QC processes and minimizing downtime.

This gauge helps streamline your quality control by providing a dependable, easy-to-use reference that confirms thread compatibility, supports consistent results across shifts, and strengthens confidence in every threaded component you approve.