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Vermont Gage 301154010 Taperlock thread plug gage, 3/4"-20 UNEF, chrome-plated tool steel member only, go tolerance class X

Vermont Gage

Vermont Gage 301154010 Taperlock Thread Plug Gage 3/4"-20 measurement tool

SKU CH-AZGN-67S8J

Tool-steel taperlock thread plug gage with a 3/4"-20 UNEF Go member, Class X tolerance and NIST-traceable certification

  • Precision threading verified by NIST-traceable Certificate of Accuracy
  • Chrome-plated tool steel hardened to RC 70-72 for extended wear life
  • Taperlock Go member ensures secure fit in 3/4"-20 UNEF threads
  • Manufactured to ASME B 1.2 standard for reliable dimensional control
  • Right-hand thread design matches standard fastener orientation

Thread Plug Gage for 3/4"-20 UNEF

The Vermont Gage 301154010 is a Go (Plus) thread plug gage designed to verify internal threads cut to 3/4"-20 UNEF Class 2B or 3B tolerances. It is intended for quality-control personnel and machinists who must confirm pitch-diameter compliance on right-hand threads. The tool-steel member is hardened to RC 70-72 and chrome plated for wear resistance.

Replaces worn or uncertified Go members

A gage should be replaced when its pitch diameter exceeds the X tolerance limit of .7175 in or when calibration intervals reveal drift beyond ASME B 1.2 allowances. The jump is justified when a shop requires a fresh Certificate of Accuracy with NIST traceability to maintain audit-ready inspection records. It is not suited for checking external threads, left-hand threads, or thread forms other than UNEF.

Member-only handle design installs in existing

The gage member locks into a compatible Taperlock handle without additional tooling. The most common error is seating the member loosely, which introduces axial play and false Go readings. Users must also verify that the handle size matches the 7/8 in Go-member length to avoid misalignment during inspection.

Highlights

  • Precision threading verified by NIST-traceable Certificate of Accuracy
  • Chrome-plated tool steel hardened to RC 70-72 for extended wear life
  • Taperlock Go member ensures secure fit in 3/4"-20 UNEF threads
  • Manufactured to ASME B 1.2 standard for reliable dimensional control
  • Right-hand thread design matches standard fastener orientation

Specifications

BrandVERMONT GAGE

Questions about this item

What handle design does the 301154010 taperlock thread plug gage use for mounting?

The gage uses a member-only handle design that fits standard taperlock handles for the 3/4"-20 UNEF size.

How is the 301154010 gage installed, and what step is often missed?

Insert the gage member into a compatible taperlock handle and secure it firmly; the step often missed is verifying the go member engages fully before locking.

What maintenance will the 301154010 gage need over time?

Periodically inspect the chrome-plated tool steel threads for wear; the RC 70-72 hardness resists deformation, but recalibration against the NIST-traceable certificate is required when pitch diameter exceeds tolerance.

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