Thread & plain gauges, built to the standard.
Ten gauge families covering every major metric, unified, pipe, taper and special thread, plus plain plug, ring and snap gauges. Each with its reference standard, range and acceptance rule, ground and verified on our own precision grinding and measurement equipment.
Browse by type: thread plug gauges, thread ring gauges, taper thread gauges, or see the full gauge manufacturer overview.
Metric thread gauges
Thread plug and ring gauges for metric 60° threads, GO / NOT-GO, to DIN ISO 1502.
Unified thread gauges
UNC / UNF / UN plug and ring gauges to ANSI / ASME B1.2, class 2A and beyond.
“G” pipe gauges
Parallel pipe thread gauges to ISO 228-2, tolerance classes A & B.
Taper gauges (NPT)
NPT taper thread gauges to B1.20.1, plus special designs: air grooves, pilots, depth steps.
NPTF & ANPT gauges
Dry-seal NPTF & ANPT gauges with L1–L3 members and 6-step crest checking.
ACME & Stub ACME
ACME & Stub ACME gauges, 2G standard with 3G / 4G for reduced backlash.
Trapezoidal gauges
Trapezoidal (Tr) thread gauges to DIN 103-9, medium and coarse tolerance.
Taper pipe threads
ISO 7-R / BSPT / PT taper pipe thread gauges for pressure-tight joints (55°).
Snap gauges
GO / NOT-GO snap gauges for external diameters, to DIN 7164 & IS 3455.
Plain plug & ring gauges
Reversible & Trilock plug gauges in tungsten carbide & steel, to I.S., B.S. and DIN.
Valve thread gauges
GO / NO GO thread plug gauges for tyre valve threads, to ISO 4570.
Can't find the exact thread?
We build non-standard and special gauges to drawing: extra lengths, air grooves, pilots, depth steps and multi-start.