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 Female Symmetrical Half-Fitting without Lock (without jaws) is the ideal solution for your tapped fixed equipment. Made in France with a standard BSP thread, it allows a quick and hermetic connection with any coupling with a lock. Versatile and robust, it is indispensable for...
The Guillemin Female Symmetrical Half-Fitting without Lock (without jaws) is the ideal solution for your tapped fixed equipment. Made in France with a standard BSP thread, it allows a quick and hermetic connection with any coupling with a lock. Versatile and robust, it is indispensable for...
The male Guillemin symmetrical half coupling without lock in aluminium is the ideal component for equipping the fixed outlets of pumps or manifolds. Fitted with a BSP (British Standard Pipe) thread and manufactured in France, it ensures a quick and secure connection with any coupling fitted with a lock. Versatile and...
The male Guillemin symmetrical half coupling without lock in aluminium is the ideal component for equipping the fixed outlets of pumps or manifolds. Fitted with a BSP (British Standard Pipe) thread and manufactured in France, it ensures a quick and secure connection with any coupling fitted with a lock. Versatile and...
The female symmetrical Guillemin half coupling in aluminium with lock is the reference equipment for a secure and lightweight connection. Made in France with a standard BSP thread, it enables reliable mechanical locking thanks to its movable jaws. Versatile and robust, it is...
The female symmetrical Guillemin half coupling in aluminium with lock is the reference equipment for a secure and lightweight connection. Made in France with a standard BSP thread, it enables reliable mechanical locking thanks to its movable jaws. Versatile and robust, it is...
The male Guillemin symmetrical half coupling in aluminium with lock (without jaws) is the ideal unloading solution for bulk transport and high-tech industries. Made in France with a standard BSP thread, it enables powerful and secure mechanical locking. Its lightness and...
The male Guillemin symmetrical half coupling in aluminium with lock (without jaws) is the ideal unloading solution for bulk transport and high-tech industries. Made in France with a standard BSP thread, it enables powerful and secure mechanical locking. Its lightness and...
The Guillemin symmetrical female half coupling in aluminum with lock (without jaws) is the specialized solution for liquid and powder bulk transport . Made in France with standard BSP threading, it is ideal for equipping petroleum product tank trucks. Its...
The Guillemin symmetrical female half coupling in aluminum with lock (without jaws) is the specialized solution for liquid and powder bulk transport . Made in France with standard BSP threading, it is ideal for equipping petroleum product tank trucks. Its...