Taper gauges (NPT) — detail
Gauge family 04 / 11

NPT thread plug & ring gauges, manufactured in Pune.

ANSI/ASME B1.20.1National Pipe Taper (NPT) · ANSI / ASME B1.20.1

NPT taper thread gauges manufactured to ANSI / ASME B1.20.1. Our expertise also covers non-standard designs: extra lengths, air grooves, pilots and depth steps.

Ring gauges
Basic & min/max step
Plug gauges
Basic & min/max step
Representative sizes & classes
MemberTypeAcceptance
External threadBasic step ringFlush within a single turn
External threadMin/max step ringFace between min & max step
Internal threadBasic / min-max plugFlush within limits

External threads: when screwed on by hand, the basic step gauge should be flush with the component face within a single turn. Internal threads: with a min/max step gauge, the component face should sit flush between the minimum and maximum step limits.

Ground on our Matrix thread grinders and verified on TRIMOS H4 before every certificate is issued.

Common questions

Questions about Taper gauges (NPT)

What is a taper gauges (npt)?

NPT taper thread gauges to B1.20.1, plus special designs: air grooves, pilots, depth steps.

Which standard does it follow?

Manufactured to ANSI/ASME B1.20.1.

What range is available?

Available ranges: Ring gauges Basic & min/max step; Plug gauges Basic & min/max step.

How is acceptance checked?

On external threads, the basic step gauge should sit flush with the component face within a single turn when screwed on by hand. On internal threads, the component face should sit flush between the minimum and maximum step limits of a min/max step gauge.

How do I request a quote?

Share the thread size and standard on our quote page and we will confirm class, availability and pricing within one business day.

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Need taper gauges (npt)?

Share your thread, standard or drawing and get the right acceptance class, certified. We supply across India and take enquiries from outside India too, see where we supply.