Precision gauging for general engineering.

General engineering covers the broadest range of threaded and plain features, and it is where most of the full Accusize range gets used: metric, unified, parallel and taper pipe, ACME, trapezoidal, and plain and snap gauges, each checked against its own reference standard.

Threaded features

Metric threads to DIN ISO 1502 and unified threads to ANSI/ASME B1.2 cover the majority of fastener and tapped-hole checks. Where a joint seals by the thread itself, NPT, NPTF/ANPT or ISO 7-R / BSPT / PT taper pipe threads apply instead, checked with a step gauge rather than a parallel GO / NOT-GO pair. ACME and Stub ACME threads to ASME B1.5 / ANSI B1.8, and trapezoidal threads to DIN 103-9, cover power-transmission and lead-screw applications.

Plain features

Bores and shafts without a thread are checked with plain plug and ring gauges to IS 3455, in Reversible or Trilock styles depending on size, or with snap gauges where the same diameter is checked repeatedly.

Choosing the right gauge

Start with the standard printed on the drawing; it fixes the thread form, or confirms the feature is plain, and the tolerance class. From there, decide plug, ring or snap based on whether the feature is internal, external, or checked repeatedly at production speed. Special and non-standard gauges are available to drawing for anything the standard range does not cover.