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Thread Identification

Being able to identify fittings really comes in handy when trying to marry up to parts of a pressure washer.

Thread forms come in all shapes and sizes, and this can be a little confusing at first.

We have compiled a thread identification chart below to help you identify any fittings you may have!


O.D = Outside Diameter

I.D = Inside Diameter

DASH Size – Common terminology in the hydraulic industry.


BSP (British Standard Pipe) Threads

DASH SIZETHREAD SIZEMALE O.D.FEMALE I.D
-2G 1/8″ – 289.6mm8.8mm
-4G 1/4″ – 1913mm11.8mm
-6G3/8″-1916.5mm15.3mm
-8G 1/2″ – 1420.8mm19mm
-10G 5/8″-1422.7mm21mm
-12G 3/4″-1426.3mm24.6mm
-16G 1″ 1133mm31mm
-20G 1.1/4″ -1141.7mm39.7mm
-241.1/2″ 1147.6mm45.5mm
-32G2″-1159.4mm57.2mm

Metric Threads

TUBE SIZETHREAD SIZEMALE O.D.FEMALE I.D.
6mmM12X1.512mm10.5mm
8mmM14 1.514mm12.5mm
10mmM16 1.516mm14.5mm
12mmM18 1.518mm16.5mm
15mmM22 x 1.522mm20.5mm
18mmM26X1.526mm24.5mm
22mmM30X230mm28mm
28mmM36X236mm34mm
35mmM45 X245mm43mm
42mmM52XX252mm50mm

BSPT Threads

DASH SIZETHREAD SIZEMALE O.D.
-2R 1/8″ 289.7mm
-4R 1/4″ – 1913.1mm
-6R 3/8″ 1916.6mm
-8R 1/2″ 1421mm
-12R 3/4″ 1426.4mm
-16R 1″ 1133.2mm
-20R 1.1/4″- 1141.9mm
-24R 1.1/2″ -111.8mm
-32R 2″59.6mm

NPT Threads

DASH SIZETHREAD SIZEMALE
-21/8″-2710.2mm
-41/4″ 1813.5mm
-63/8″ 1817mm
-81/2″ 1421.2mm
-123/4″ 1426.5mm
-161″ 11.533.1mm
-201.1/4″ 11.541.9mm
-241.1/2″ 11.548mm
-322″-11.560mm

Thread identification is a great skill to have, giving you confidence in ordering online and assembling your own kit.

All the best!

Conrad @ AC

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