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Plain cylindrical ring gauge in uncoated tool steel, #4-40 UNC thread

Vermont Gage

Vermont Gage 361110050 Ring Gage #4-40 UNC Tool Steel measurement tool

SKU CH-B0H4-1RQAY

Go/No-Go ring gage verifies #4-40 UNC threads with .095 in and .0925 in pitch diameters in RC 60-62 tool steel

  • #4-40 UNC threads inspected with .095 in Go and .0925 in No-Go pitch diameters
  • Adjustable Tool Steel body hardened to RC 60-62 resists wear during repeated checks
  • Certificate of Accuracy with NIST traceability validates every measurement
  • Compatible with 1T holder for quick setup on the bench
  • Uncoated finish preserves true thread geometry without plating buildup

Precision Thread Verification Tool

The Vermont Gage 361110050 is a #4-40 UNC adjustable ring gauge machined from tool steel hardened to RC 60-62. It provides Go/No-Go inspection of external threads with pitch diameters of .095 in for the Go member and .0925 in for the No-Go member. Quality engineers and machinists use it to verify Class 2A thread conformance on production parts.

Durable Uncoated Steel Construction

The gauge body is finished without coating, presenting the raw hardened steel surface directly to the workpiece. Hardness in the RC 60-62 range resists wear during repeated hand-gauging operations. Thread length on each member is 5/32 in, and the assembly fits a compatible 1T holder for stable handling during inspection.

Traceable Accuracy Documentation

Each gauge ships with a Certificate of Accuracy that carries NIST traceability, eliminating the need for a separate long-form calibration certificate on receipt. The adjustable design allows authorised recalibration to maintain conformity over time. No additional software or accessories are included in the package.

Highlights

  • #4-40 UNC threads inspected with .095 in Go and .0925 in No-Go pitch diameters
  • Adjustable Tool Steel body hardened to RC 60-62 resists wear during repeated checks
  • Certificate of Accuracy with NIST traceability validates every measurement
  • Compatible with 1T holder for quick setup on the bench
  • Uncoated finish preserves true thread geometry without plating buildup

Specifications

BrandVERMONT GAGE

Questions about this item

How do I install the #4-40 UNC ring gage into a 1T holder without damaging the adjustable design?

Align the gage with the 1T holder threads, then hand-tighten until the Go member pitch diameter of .095 in engages smoothly; avoid wrench force that can distort the Tool Steel body hardened to RC 60-62.

What maintenance or replacement will the Tool Steel ring gage need after repeated Go/No-Go checks?

Periodically verify the Go pitch diameter of .095 in and No-Go pitch diameter of .0925 in against the Certificate of Accuracy with NIST Traceability; replace the gage if wear moves either diameter outside the 2A thread class tolerance.

What limit appears first when the gage is used continuously for high-volume #4-40 thread inspection?

The uncoated Tool Steel surface hardened to RC 60-62 will show thread-flank wear first, gradually increasing the Go member pitch diameter beyond .095 in and causing false accepts on 2A class parts.

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