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Blue-handled double-end plug gauge with uncoated steel ends

Vermont Gage

Vermont Gage 401104020 Plug Gage Assembly NPT L-1 measurement tool

SKU CH-EYFS-XW6MJ

NPT plug gage assembly with double-end Taperlock handle for 1/4 in-18 thread inspection to ASME B 1.20.1

  • Hardened tool steel RC 60-62 resists wear
  • NPT L-1 plug gauges 1/4 in-18 threads
  • Double-end handle with Taperlock 3 speeds changeover
  • ASME B 1.20.1 compliance ensures thread accuracy
  • NIST-traceable Certificate of Accuracy validates calibration

Precision NPT Thread Verification

The Vermont Gage 401104020 plug gage assembly inspects 1/4 in-18 NPT threads to L-1 tolerance Class X. Machinists and quality engineers use it to confirm internal pipe threads meet ASME B 1.20.1 requirements before assembly. A NIST-traceable Certificate of Accuracy ships with each unit.

Hardened Tool Steel Stability

Tool steel hardened to Rc 60-62 resists wear during repeated go/no-go checks. The uncoated finish avoids coating buildup that could mask thread errors. Blue Taperlock 3 handles measure 3 in and provide a secure grip for hand inspection without wrench leverage.

Consistent Gauging Under Repetitive Use

Right-hand thread direction matches standard NPT piping practice. The double-end handle design lets operators flip the gage for quick go and no-go verification. Hardness retention at Rc 60-62 maintains tolerance integrity across high-volume inspection cycles.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $102.99
Pricier than about 64% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameVERMONT GAGE

Questions about this item

How do I install the 401104020 plug gage assembly and what step is often missed?

Screw the NPT 1/4 in-18 thread into the component by hand, then tighten with a wrench; the step people skip is verifying the L-1 face sits flush to confirm the thread depth meets ASME B 1.20.1.

What maintenance or replacement will the 401104020 plug gage need later?

The tool steel body at Rc 60/62 resists wear, but the NPT threads should be inspected periodically against the Certificate of Accuracy; if the L-1 face no longer seats flush within tolerance class X, replace the gage.

What limit appears first when the 401104020 plug gage is used continuously?

Thread wear on the 1/4 in-18 NPT profile reaches the class X tolerance limit before the Rc 60-62 hardness degrades, so the gage fails its NIST-traceable verification first.

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