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Blue-handled pipe thread plug gauge 1/8-27 tool steel uncoated finish

Vermont Gage

Vermont Gage 421102530 Pipe Thread Plug 1/8"-27 Tool Steel measurement tool

SKU CH-4Y5N-FK4FM

Checks 1/8"-27 NPSM threads with Go/No-Go pitch diameters of .3736 in and .3783 in using 60-62 Rc tool steel

  • Precision thread verification with 1/8"-27 NPSM Go/No-Go gauging
  • Hardened tool steel at 60-62 Rc resists wear for repeatable accuracy
  • NIST-traceable Certificate of Accuracy included for documented compliance
  • Class X tolerance ensures tight pitch-diameter control on Go .3736 in and No-Go .3783 in
  • Blue aluminium Taperlock handle provides secure grip and easy member change

Vermont Gage 421102530 Pipe Thread Plug

This Vermont Gage 421102530 pipe thread plug is a go/no-go gauge for verifying 1/8"-27 NPSM internal threads. It is built from tool steel hardened to 60/62 Rc and includes a blue aluminium Taperlock handle. A certificate of accuracy with NIST traceability is supplied. Machinists and quality inspectors use it to confirm pitch diameter compliance on threaded components.

Replaces worn or uncertified thread gauges

The gauge replaces worn or uncertified thread plugs that can no longer guarantee tolerance class X acceptance. The jump is worth it when existing tools show flank wear, corrosion or lost certification, risking false passes on 0.3736 in go and 0.3783 in no-go pitch diameters. Shops maintaining NIST-traceable records gain immediate compliance by swapping in this certified assembly.

Holds tolerance through repeated verification cycles

Tool steel construction at 60/62 Rc hardness resists deformation during repeated go/no-go checks on production parts. The uncoated finish avoids coating wear that could alter pitch diameter readings over time. Aluminium Taperlock handle dissipates hand heat, reducing thermal expansion influence on the gauge body during sustained inspection sessions.

Highlights

  • Precision thread verification with 1/8"-27 NPSM Go/No-Go gauging
  • Hardened tool steel at 60-62 Rc resists wear for repeatable accuracy
  • NIST-traceable Certificate of Accuracy included for documented compliance
  • Class X tolerance ensures tight pitch-diameter control on Go .3736 in and No-Go .3783 in
  • Blue aluminium Taperlock handle provides secure grip and easy member change

Specifications

BrandVERMONT GAGE

Questions about this item

What handle design and size does the 421102530 pipe thread plug use?

The gauge comes with a Taperlock 2 handle assembly that is three inches long and made of blue aluminium.

How do you install the gauge and what step is commonly missed?

Insert the go member first; it should enter the thread fully without force. Then try the no-go member — it must not enter more than three turns. The step often missed is verifying the no-go limit rather than assuming a tight fit means pass.

What wear or recalibration will the tool steel plug need over time?

The tool steel is hardened to 60-62 Rc. With normal use the go and no-go pitch diameters of .3736 in and .3783 in will hold tolerance for a long period; when wear is suspected, return the gauge for recalibration using the included NIST-traceable certificate as the baseline.

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