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Malcolm Smith
Power Cleaning 45 Roundponds Melksham Wiltshire SN12 8DW 01225 707200 (Monday - Friday 8.00am - 6.00pm Saturday 8.30am - 12.30pm) |
What FITTING SIZE ?
To Start off with we get more trouble with fittings than any other products. Below are some "tips" - forgive me if I sound like "teaching Granny to suck eggs" - but belive me !!!!!!! So lets start from the begining. Q) What is a MALE THREAD & what is a FEMALE THREAD ? A) A male thread screws into a female thread - as simple as that. Below is a MALE Threaded Nipple (sometimes this is called a Hex Nipple)  Q) What SIZE THREAD ? A) Take a cross section measurement across the threaded end of a MALE fitting or the measurement across the inside of a FEMALE fitting. - LOOK IT UP ON THE CHART BELOW. Q) What does BSP mean ? A) British Standard Pipe Thread. (This is used right across the UK and much of the world in the pressure washing industry) Cross Section Measurment BSP FITTINGS Fitting Size Female Male 1/8" BSP 8.566mm 9.728mm 1/4" BSP 11.445mm 13.157mm 3/8" BSP 14.950mm 16.662mm 1/2" BSP 18.631mm 20.955mm 3/4" BSP 24.117mm 26.441mm 1" BSP 30.291mm 33.249mm 1 1/4" BSP 38.952mm 41.910mm 1 1/2" BSP 44.324mm 47.803mm 2" BSP 56.656mm 59.614mm METRIC FITTINGS M12 10.105mm 12mm M14 11.835mm 14mm M16 13.835mm 16mm M18 15.294mm 18mm M21 18.294mm 21mm M22 19.294mm 22mm M24 20.752mm 24mm M27 23.752mm 27mm M30 26.211mm 30mm Remember the Cross Section Measurment of a fittimg is not the fitting size if it is a "BSP" THREAD - use the chart above. Metric Fittings - the MALE is always Cross Section Measurment in "mm" the female will be smaller. Metric threads are a little bit finer than BSP threads. LOOK OUT FOR 1/2" BSP and M22 Fittings - they can look the same - take a good look and the M22 will be finer than 1/2" Now just when you think you got it all onboard - just to make things interesting there is a thread called "NPT" This is a USA thread and is not used much in the UK, BUT, yes there is always a BUT ! Some equipment and parts come in from across the "pond" and they can be a "B******" to find high pressure fittings for. Cross Section Measurment NPT FITTINGS Fitting Size Male Threads per Inch 1/8" NPT 10.28mm 27 tpi 1/4"NPT 13.72mm 13 tpi 3/8" NPT 17.15mm 18 tpi 1/2" NPT 21.34mm 14 tpi 3/4" NPT 26.67mm 14 tpi 1" NPT 33.40mm 11.5 tpi Malcolm Smith Power Cleaning can supply NPT fittings (NPT to BSP) - click here to goto these products .jpg) Use this to help make good high pressure joints (click here to go to product)  PTFE TAPE 12m. Seals joints, helps prevent leaks and improves seal quality. BS 7786 - R95400  Dowty Washers help to make good seals/joints. - (click here to goto product) For a QUICK GUIDE to Fittings - click here The HOME of Pressure Washers & Pressure Washing Spares - Jet Washers, Pressure Washing Equipment & Pressure Washer Spares & fittings. Oertzen water jetting equipment - Interpump pumps - Kranzle Pressure washers - Speck pump spares - Replacement UDOR pumps - Pressure washer accessories - nozzles, hose & surface cleaners.
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