Osg 1500300905 Go No-go Thread Gage 5/16-24 Unjf 3B

Product Description

The OSG 1500300905 is a double-end go/no-go thread limit gage designed to inspect 5/16-24 UN(J)F threads to a 3B tolerance classification. The gage is manufactured from high-speed steel and features a TiN (titanium nitride) coating for extended wear resistance and corrosion protection. Each unit ships factory-calibrated, making it ready for immediate use in production or inspection environments. Machinists, quality control technicians, and tool-and-die professionals use this type of gage to confirm that internally threaded components meet dimensional and tolerance requirements before assembly. The double-end design integrates both go and no-go members into a single, compact tool for efficient workflow.

This gage is suited for inspecting 5/16-24 UNJF 3B internal threads found in precision mechanical assemblies, aerospace fastener applications, and general industrial manufacturing where unified fine-pitch thread standards are specified. The 3B tolerance class indicates a standard fit commonly required in production threading operations. The calibrated-from-factory condition supports direct deployment on the shop floor or inspection bench without additional setup steps.

Key Features

• Double-end design combines go and no-go members in a single tool
• Factory-calibrated for immediate use out of the box
• TiN coating improves wear resistance and extends service life
• High-speed steel construction provides durability in production environments
• Inspects 5/16-24 UN(J)F internal threads to 3B tolerance classification

Compatibility

Designed for inspection of 5/16-24 UN(J)F 3B internal threads in conformance with unified thread standard requirements. Suitable for use wherever 5/16-24 UNJF 3B thread verification is specified.

Installation Notes

Thread limit gages are handled and used by quality control inspectors and machinists — no power tools or trade licenses are required for normal gage use. Store the gage in its protective case when not in use to prevent damage to the precision-ground surfaces. Clean threads and gage members before inspection to avoid false readings caused by chips or debris. Do not force the no-go member into a threaded bore; resistance indicates an out-of-tolerance condition.