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-fitting with stainless steel weld-on lock is the ultimate solution for securing your connection points on fixed networks. Its weldable sleeve ensures a permanent structural seal, while its mechanical lock ensures a fast and robust coupling. Made of stainless steel...
The Guillemin symmetrical half-fitting with stainless steel weld-on lock is the ultimate solution for securing your connection points on fixed networks. Its weldable sleeve ensures a permanent structural seal, while its mechanical lock ensures a fast and robust coupling. Made of stainless steel...
The Guillemin symmetrical half-fitting without stainless steel weld lock is the ideal solution for creating fixed and durable connection points on your piping networks. Its weld-on bushing ensures a perfect structural seal, while its stainless steel construction guarantees maximum corrosion...
The Guillemin symmetrical half-fitting without stainless steel weld lock is the ideal solution for creating fixed and durable connection points on your piping networks. Its weld-on bushing ensures a perfect structural seal, while its stainless steel construction guarantees maximum corrosion...
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