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 symmetrical connection with reduced ringed socket with polypropylene collar is intended to be crimped on pipes. It can be assembled by different crimping systems: stamped skirts, ruffled necklaces, strapping and notched...
The symmetrical connection with reduced ringed socket with polypropylene collar is intended to be crimped on pipes. It can be assembled by different crimping systems: stamped skirts, ruffled necklaces, strapping and notched...
The Guillemin symmetrical half-fitting with corrugated sleeve in AISI 316 stainless steel (1.4401) is the high-security transfer solution for corrosive and sensitive fluids. Compliant with NF E 29.572 standards, this 16 bar fitting offers exceptional resistance (50 bar burst) and unrivalled durability in...
The Guillemin symmetrical half-fitting with corrugated sleeve in AISI 316 stainless steel (1.4401) is the high-security transfer solution for corrosive and sensitive fluids. Compliant with NF E 29.572 standards, this 16 bar fitting offers exceptional resistance (50 bar burst) and unrivalled durability in...
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...
The Guillemin symmetrical half-fitting with reduced corrugated bushing and AISI 316 stainless steel (CF8M) flange offers maximum safety for the transfer of aggressive fluids. Compliant with the NF E 29.572 and EN 14420-8 standards, it can withstand a working pressure of 16 bars and a burst at 50 bars. Ideal for...
The Guillemin symmetrical half-fitting with reduced corrugated bushing and AISI 316 stainless steel (CF8M) flange offers maximum safety for the transfer of aggressive fluids. Compliant with the NF E 29.572 and EN 14420-8 standards, it can withstand a working pressure of 16 bars and a burst at 50 bars. Ideal for...
The Guillemin symmetrical half-fitting with corrugated copper alloy bushing is the reference solution for crimping technical pipes in corrosive environments. Robust and versatile, this "firefighter" fitting is compatible with suction and discharge in the oil, chemical and agricultural industries. Its bronze or...
The Guillemin symmetrical half-fitting with corrugated copper alloy bushing is the reference solution for crimping technical pipes in corrosive environments. Robust and versatile, this "firefighter" fitting is compatible with suction and discharge in the oil, chemical and agricultural industries. Its bronze or...
Guillemin Symmetric Half Coupling with reduced annular socket in copper alloys, designed to be crimped onto flexible hoses. Compatible with various crimping systems: drawn ferrules, trunnion clamps, metal banding and serrated ferrules. Ideal for firefighting and demanding industrial applications (oil,...
Guillemin Symmetric Half Coupling with reduced annular socket in copper alloys, designed to be crimped onto flexible hoses. Compatible with various crimping systems: drawn ferrules, trunnion clamps, metal banding and serrated ferrules. Ideal for firefighting and demanding industrial applications (oil,...
Guillemin firefighter symmetric half coupling with reduced annular socket and flange in professional-grade copper alloy. Designed for crimping onto hoses with various systems: pressed ferrules, trunnion clamps, band crimping or serrated ferrules. A robust and reliable solution for demanding industrial applications: petroleum, chemicals,...
Guillemin firefighter symmetric half coupling with reduced annular socket and flange in professional-grade copper alloy. Designed for crimping onto hoses with various systems: pressed ferrules, trunnion clamps, band crimping or serrated ferrules. A robust and reliable solution for demanding industrial applications: petroleum, chemicals,...
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