Osg 1500300305 Thread Limit Gage 6-32 Unjc 3B Go No-go

Product Description

The OSG 1500300305 is a double-end GO/NO-GO thread limit gage designed to inspect 6-32 UN(J)C 3B unified inch threads. Built from high-speed steel with a TiN (titanium nitride) coating, this gage checks both the maximum material condition and minimum material condition of internal threads in a single tool. It arrives factory-calibrated and is used by machinists, quality inspectors, and toolroom technicians to verify thread conformance to 3B tolerance class specifications. The double-end design puts the GO member on one end and the NO-GO member on the other, eliminating the need for separate gages.

This gage is suited for production inspection and quality control environments where 6-32 UNJC internally threaded components must meet 3B class limits. Typical applications include aerospace, defense, and precision manufacturing where UNJC thread form requirements apply. It is also appropriate for general metrology labs and incoming inspection stations verifying fastener hole threads in machined parts. The calibrated status makes it ready for immediate use in ISO or AS9100-compliant inspection workflows.

Key Features

• Double-end design combines GO and NO-GO members in one gage body
• High-speed steel construction for durability and wear resistance
• TiN coating extends gage life and reduces friction during inspection
• Factory-calibrated and ready for use out of the box
• Conforms to 3B thread tolerance class for 6-32 UN(J)C threads
• UNJC thread form compatible for controlled-root radius applications

Compatibility

Designed for inspection of 6-32 UN(J)C internally threaded components held to ASME B1.2 3B tolerance class limits. Verify thread form and pitch requirements before use to confirm fitment with your specific application.

Installation Notes

Thread limit gages are inspection tools and do not require installation in a mechanical system. Handle the gage with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store in the supplied case or a protective holder when not in use to protect the precision ground threads. Periodic recalibration against NIST-traceable standards is recommended to maintain measurement integrity over time.