Vermont Gage 361134040 Threaded Ring Gage 3/8-24 Unf

Product Description

The VERMONT GAGE 361134040 is a single-ring No Go threaded ring gage used to verify that an external thread does not exceed the maximum material condition for its tolerance class. Manufactured from tool steel, this gage is designed to reject out-of-tolerance parts when the ring engages the thread — a No Go gage should not pass over a conforming thread. It is calibrated to NIST standards and classified to ANSI Class 3A, the tightest fit class in the inch unified thread series. Machinists, quality technicians, and tool-room inspectors use this gage as part of a go/no-go inspection routine on threaded fasteners and tapped components.

This gage is suited for incoming inspection, in-process quality control, and final inspection of externally threaded parts with a 3/8-24 UNF thread form. UNF (Unified National Fine) threads are common in precision fastening applications across aerospace, automotive, hydraulic fittings, and instrumentation. The Class 3A designation applies to close-tolerance external threads where minimal clearance and high accuracy are required. This is a single-ring gage, meaning it covers one functional condition — No Go — and is typically used alongside a matching Go ring gage to complete the full thread inspection.

Key Features

• No Go ring gage rejects threads exceeding maximum material condition for Class 3A tolerance
• Thread size 3/8-24 UNF for fine-pitch external thread inspection
• Tool steel construction for wear resistance and dimensional stability
• Calibrated to NIST standards for traceable measurement accuracy
• Single-ring design for dedicated No Go inspection use
• UNSPSC Code 41111619 for procurement and classification systems

Compatibility

Designed for inspection of external threads conforming to the 3/8-24 UNF Class 3A thread standard per ANSI/ASME B1.2 unified inch screw thread specifications.

Installation Notes

Threaded ring gages are handled and used by quality control technicians and machinists — not installed in a system. Before use, clean both the gage and the part thread of chips, oil, and debris to prevent false readings. Do not force the No Go gage; if resistance is felt, the part thread is within tolerance and the gage should not pass. Store ring gages in a controlled environment away from temperature extremes and moisture to preserve calibration integrity.