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Plain cylindrical steel ring gauge with uncoated matte finish and visible thread profile

Vermont Gage

Vermont Gage 361127050 Ring Gage 1/4-28 Tool Steel measurement tool

SKU CH-D6MA-18XXE

Threaded ring gauge verifies 1/4"-28 UNF threads with Go/No-Go pitch diameters of .2258 and .2225 inches, hardened tool steel RC 60-62, adjustable design.

  • Precision thread verification with Go/No-Go pitch diameters .2258 in and .2225 in
  • Durable Tool Steel construction hardened to RC 60-62 for extended service life
  • Adjustable gauge design fits compatible 2T holder for versatile setup
  • NIST-traceable Certificate of Accuracy included for documented calibration confidence
  • UNF 1/4-28 thread class 2A with 11/32 in thread length for standard inspection

Vermont Gage 1/4-28 Ring Gage

The Vermont Gage 361127050 is a precision thread inspection tool for 1/4-28 UNF threads. It serves machinists and quality engineers who verify external threads on screws, bolts or studs. The adjustable design uses tool steel hardened to RC 60-62 for wear resistance. A Certificate of Accuracy with NIST traceability is included.

Go/No-Go limits for 2A class threads

This ring gage checks pitch diameter against 2A class tolerances. The Go member accepts threads at 0.2258 inch pitch diameter while the No-Go member rejects at 0.2225 inch. Thread engagement length is 11/32 inch. The fixed UNF 28 threads-per-inch pitch and 2A class define the acceptance zone; no other thread forms or classes are covered.

Adjustable holder installation

The gage fits a compatible 2T size holder for secure mounting. Adjustment requires loosening the locking mechanism, setting the ring to a master plug, then retightening. Common issues include over-tightening the lock screw which distorts the thread form, or failing to re-verify against a setting standard after adjustment. Uncoated tool steel demands light oil to prevent corrosion.

Highlights

  • Precision thread verification with Go/No-Go pitch diameters .2258 in and .2225 in
  • Durable Tool Steel construction hardened to RC 60-62 for extended service life
  • Adjustable gauge design fits compatible 2T holder for versatile setup
  • NIST-traceable Certificate of Accuracy included for documented calibration confidence
  • UNF 1/4-28 thread class 2A with 11/32 in thread length for standard inspection

Specifications

BrandVERMONT GAGE

Questions about this item

Should I choose the Go member or the No-Go member for checking 1/4-28 threads?

The Go member with pitch diameter .2258 in verifies the minimum thread size, while the No-Go member with pitch diameter .2225 in checks the maximum; both are supplied as a set for full 2A class inspection.

What does the pitch diameter .2258 in mean when the gage is used on a real part?

A 1/4-28 UNF thread that accepts the Go member meets the minimum pitch diameter of .2258 in, confirming it will assemble with a mating 2A external thread.

How does the adjustable 2T holder design affect the gage's calibration range?

The adjustable design allows the ring to be set precisely to the .2258 in Go and .2225 in No-Go pitch diameters and locked in a compatible 2T holder for repeatable inspection.

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