The JBO Thread Ring Gauge (GO) - UNC - Left Hand - 2A - No. 1 x 64 is a precision Go gauge used to verify external UNC left-hand thread diameters on fasteners, fittings, and machined components. It provides fast Go/No-Go checks during assembly, inspection, and quality control to ensure components meet the required major diameter.

Manufactured from hardened steel for durability, this ring gauge resists wear in demanding shop environments. Its simple, robust design supports repeated use, precise readings, and quick identification of components that conform to the specified thread size.

• Precise Go/No-Go verification for UNC Left-Hand 2A No. 1 x 64: Delivers fast, clear accept/reject signals to confirm major diameter and thread conformance, reducing guesswork and rework.
• Hardened steel construction for durability: Built to withstand daily use in workshops and QA labs, maintaining tolerance and accuracy over time.
• User-friendly conformance indication: Easy-to-read design helps inspectors quickly identify properly formed threads, speeding QC checks and minimizing inspection delays.

Using this gauge helps streamline inspection workflows, cut downtime, and improve consistency across batches. Its durable construction and precise sizing provide reliable reference data from first piece to final inspection, giving you confidence in every threaded component you manufacture or service.