Thread Gauges
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 & 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 |
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 |
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 | |||
