Thread Gauges

Plain Plugs & Rings

Aerosol Gauges

Length, Groove, Thickness & Diameter

Spline Gauges & Gear Metrology

3-Point Groove Measurement

Thread Gauges

We deliver a comprehensive range of standard sizes of screw thread gauges from stock, including metric M2 to M100, Tr, UNC, UNF, G, BSW, NPT, R-series and of course can advise on non-standard classes of fit, special thread forms and special designs on short lead times.

We represent Europe’s largest manufacturer of precision gauges; substantial investment in plant, equipment and measuring technology over a period of many years enables them to deliver gauges of the highest quality at very competitive prices.

Thread Plug Gauges

Thread Ring Gauges

Thread & Plain Gauge Terminology

Metric ISO-thread ISO 965

Gauge dimensions ISO1502

Tolerance Zone	Tolerance Zone External Thread	Tolerance Zone Internal Thread
Fine	4h	5H
Medium	for threads 1-1.4mm 6h for threads > 1.4mm 6g	for threads 1-1.4mm 5H for threads > 1.4mm 6H
Coarse	8g	7H

Thread Plug Gauges

Thread Plug Gauge Double Ended

BSW and BSF threads BS 84

Gauge dimensions BS919

col.1	col.2	col.3	col.4
External Thread	close class	medium class	free class
Internal Thread	medium class	normal class	normal class

Cylindrical pipe threads DIN ISO228 Part1

Gauge dimensions DIN ISO 228 Part 2

col.1	col.2	col.3	col.4
Tolerance class	external thread / bolt	medium A	coarse B
Tolerance class	internal thread / nut	medium

ISO metric trapezoidal threads DIN 103
Tolerance zones group N (normal)

Gauge dimensions DIN 103 Part 9

Tolerance Classes	Tolerance Zone external thread	Tolerance Zone internal thread
medium (m)	7e	7H
coarse (g)	8c	9H

Thread Ring Gauges

Round thread DIN 405-1, 405-2
Tolerance zones group N (normal)

Gauge dimensions DIN 405-3

Tolerance Zone external thread	Tolerance Zone internal thread
7h & 7e	7H

Unified inch screw threads BS1580
Tolerance zones group N (normal)

Gauge dimensions BS 919

Tolerance Zone external thread
External thread	1A	2A	3A
Internal thread	1B	2B	3B

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Thread Gauges

Thread & Plain Gauge Terminology

Thread Gauges

Plain Plugs & Rings

Aerosol Gauges

Length, Groove, Thickness & Diameter

Spline Gauges & Gear Metrology

3-Point Groove Measurement