Osg 1500301305 Thread Limit Gage 9/16-18 Unjf 3B Tin

Product Description

The OSG 1500301305 is a double-end Go/No Go thread limit gage designed to inspect 9/16-18 UN(J)F 3B threaded features for conformance to class tolerance. Manufactured from high-speed steel with a TiN (titanium nitride) coating, it provides wear resistance during repeated inspection cycles. The gage is factory-calibrated and combines both the Go and No Go members in a single double-end handle, reducing changeover time on the shop floor or in the field. Machinists, quality inspectors, and precision tradespeople use this tool to verify threaded holes and tapped bores meet the specified 3B classification before assembly.

This gage is suited for inspection of 9/16-18 UNJF internally threaded components in manufacturing, aerospace, and general mechanical assembly environments. The UNJF thread form, with its controlled root radius, is common in high-stress and fluid-system fastener applications. The 3B classification indicates a standard commercial tolerance fit, making this gage appropriate for both production-line sampling and individual part verification.

Key Features

• Go and No Go members in a single double-end gage body for efficient inspection
• TiN coating improves surface hardness and extends gage service life
• High-speed steel construction for dimensional stability under repeated use
• Factory-calibrated to 9/16-18 UNJF 3B thread class tolerances
• Compact double-end format reduces tool inventory for thread inspection tasks

Compatibility

Designed for inspection of internally threaded features with a 9/16-18 UN(J)F 3B thread classification. Suitable for use wherever 9/16-18 UNJF tapped holes must be verified against class 3B tolerance limits.

Installation Notes

Thread limit gages are inspection tools installed by hand — no power tools, torque drivers, or cutting lubricants are required for standard use. Before use, ensure the threaded bore being inspected is clean and free of chips, burrs, and fluid residue that could cause a false reading. The Go member must pass fully through the threaded feature; the No Go member must not enter more than two turns. Store the gage in a protective case away from impact hazards to maintain calibration integrity.