Vermont Gage 361111010 Threaded Ring Gage 4-48 Unf Go

Product Description

The VERMONT GAGE 361111010 is a Go-type threaded ring gage designed to verify the maximum material condition of external threads. Built from tool steel, this single-ring gage checks 4-48 UNF (Unified National Fine) threads to Class 2A tolerance standards. It is used by machinists, quality control inspectors, and tool-room technicians to confirm that a threaded part will assemble correctly with its mating component. The Go gage must pass fully over the threaded workpiece for the part to be accepted. NIST-traceable standards govern its calibration, making it suitable for precision inspection environments where traceability documentation is required.

This gage applies to inspection of No. 4-48 UNF external threads, which are common in small fastener, instrument, and precision-assembly applications. Class 2A is the standard tolerance class for general-purpose threaded fasteners and covers the majority of commercially produced bolts, screws, and studs. A quality control technician or tool-room inspector would use this gage at incoming inspection, in-process checking, or final part acceptance stages.

Key Features

• Go-type single ring gage verifies maximum material condition acceptance of external threads
• 4-48 UNF thread form for fine-pitch No. 4 diameter applications
• Class 2A tolerance classification for general-purpose fastener inspection
• Tool steel construction provides durability and wear resistance in production environments
• NIST-traceable standards compliance supports calibration documentation requirements

Compatibility

Designed for use on external 4-48 UNF Class 2A threaded workpieces in accordance with Unified National Fine thread standards.

Installation Notes

Threaded ring gages are handled and used by machinists and quality control inspectors, not installed in a system. Keep the gage clean and lightly oiled when not in use to prevent corrosion and wear. Do not force the gage onto a thread; if resistance is felt, the part is out of tolerance or debris is present. Periodic recalibration against NIST-traceable masters is recommended to maintain measurement integrity.