Not sure which fitting you need? Tell us what you have, we show you what screws onto it — live prices and stock.
Pipe thread chart: inch / mm conversion (BSP, 15/21, 20/27, S60x6)
A “1/2 inch” thread measures 20.96 mm, not 12.7: in plumbing, the inch size is not converted, it is read from a chart. Here you will find the inch / mm correspondence of every common thread (BSP or “gas thread”, French names 15/21 · 20/27 · 26/34, NPT, S60x6 IBC tanks, Guillemin, Camlock, PVC), a tool that identifies your thread and the fitting that goes with it, and the pitfalls to avoid.
Which thread do you have? Which fitting do you need?
No need to know the name of your thread. Tell us what you need to connect to, or type what you know (“20/27”, “3/4 inch”, “S60x6”, “26.4 mm”): we identify the thread and show you the fittings that go with it. Dimensions according to ISO 228, ISO 7 and ASME B1.20.1.
✔ Shipped next working day from our stock✔ 4.5/5 from more than 6,400 customer reviews✔ Not sure? Describe what you need, we will find the fitting with you⎙ Printable thread gauge (PDF, actual size)
No need to know the name of your thread. Just answer the question: what do you need to connect to?
With a caliper, measure the outside diameter of a male (thread visible on the outside) or the inside diameter of a female (thread inside the hole), at the root of the thread.
The Guillemin symmetrical half coupling with reduced corrugated sleeve and collar is the reference solution for secure crimping on technical hoses. Manufactured in France from high-strength aluminium (T6), it complies with NF E 29.572 and EN 14420-8 standards. Capable of withstanding a service...
The Guillemin symmetrical half coupling with reduced corrugated sleeve and collar is the reference solution for secure crimping on technical hoses. Manufactured in France from high-strength aluminium (T6), it complies with NF E 29.572 and EN 14420-8 standards. Capable of withstanding a service...
The Guillemin symmetric half-coupling with annulated shank in aluminium is the professional solution for crimping technical flexible hoses. Made in France , this "fire hose" coupling is compatible with suction and discharge for various fields such as firefighting, petrochemical industry and...
The Guillemin symmetric half-coupling with annulated shank in aluminium is the professional solution for crimping technical flexible hoses. Made in France , this "fire hose" coupling is compatible with suction and discharge for various fields such as firefighting, petrochemical industry and...
The Guillemin grooved socket aluminium half-coupling is designed for robust assembly with segmented clamps. Made in France to NF E 29.572 standards, it supports a working pressure of 16 bar. Ideal for petroleum, chemical and agricultural sectors, this AS7G T6-treated aluminium coupling ensures...
The Guillemin grooved socket aluminium half-coupling is designed for robust assembly with segmented clamps. Made in France to NF E 29.572 standards, it supports a working pressure of 16 bar. Ideal for petroleum, chemical and agricultural sectors, this AS7G T6-treated aluminium coupling ensures...
The Guillemin symmetrical half-coupling without jaws in aluminium is the ideal crimping accessory for your technical hoses. Made in France , this lightweight and robust coupling is designed to fit perfectly with locking models, both in suction and discharge. Compatible with drawn skirts and...
The Guillemin symmetrical half-coupling without jaws in aluminium is the ideal crimping accessory for your technical hoses. Made in France , this lightweight and robust coupling is designed to fit perfectly with locking models, both in suction and discharge. Compatible with drawn skirts and...
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