Camlock Couplings - Gall Thomson

Camlock Couplings

Camlock Couplings

gall thomson camlock camlock r camlocks

Up to 50 times faster than traditional flange connection methods

Fast, safe and convenient flange connections for operations that demand the highest standards in safety and operational efficiency.

No more complicated nuts and bolts: simply twist and the connection is complete.


Click the video above and see a comparison demonstration of how fast and convenient the Gall Thomson Camlock is when compared to traditional flange connection methods.

Click here to see the NEW Camlock R

The next generation of Gall Thomson Camlock offers locking mechanism and fully sealed Ratchet Cams

camlockr gall-thomson-camlock-r-camlock

Click here to see the NEW Heavy Duty Camlock HD

Heavy Duty Camlock Coupling designed to withstand the most demanding conditions

Gall Thomson Camlock HD Gall Thomson Camlock heavy duty cams


Gall Thomson Camlock Couplings are used for all types of applications including cryogenic, submersible and hydraulic operations.

The Gall Thomson Camlocks are in everyday use throughout the world in marine loading and discharging terminals, ports, refineries, dock facilities, chemical plants and distribution centres.

Features and benefits

The Gall Thomson Camlock coupling replaces the conventional time consuming and hazardous method of drift pin, nut and bolt flange connections.

Dependable leak-proof seal

The permanently positioned O Ring face seal provides a dependable and leak-proof seal and avoids the time required and hazard of crushed hands and fingers when trying to fix conventional gaskets between flanges.

Impossible to loosen

The advanced design allows an area of contact between the cam and mating flange face. The helical arrangement ensures a definite wedging action, making it impossible to loosen during normal operating conditions when there is pressure in the line.

Easy adjustment

A round steel bar or special locking wrench are the only tools needed to lock, tighten or release the cam.

Fits any existing flange or pipe

The Gall Thomson Camlock Coupling will fit any existing flange or pipe arrangement.

How it works

The two flanges are automatically positioned within the cam blocks around the coupling and locked together.

The cams are then turned by hand using a locking bar (supplied with the Camlock coupling). Each cam takes approximately 5 seconds to lock.


Studded: Bolted direct to existing pipe/hose flanges.
Slip-on: Fitted over the end of the standard pipe and welded in position.
Weld neck: Fitted directly to the end of the pipe and welded in position.
Short Spool Piece: Consisting of two flanges. One flange is standard; the other incorporates the coupling cam assemblies. The flanges are connected via a short tube. The standard flange bolts directly to an existing flange.
Coupling flange: Raised mating face with integral sealing O Ring.
Standard flange: Short spool piece is a raised face without O Ring.

Locking Bar

A locking steel bar is supplied with the Camlock coupling. Size: 15mm diameter x 9” long.

Standard Types and sizes of 150 ASA Couplings

Standard flange: 150 ASA/ANSI Also available: 300 ASA/ANSI, DIN

Blanking flanges

Blanking flanges provide protection when not in use: available in aluminium, steel or plastic.

Special requirements

Due to the simple and versatile design of the Welin Camlock Coupling, the device can be easily adapted for many special requirements. Some of which are listed below.

Flanges to suit 300Ib ASA: DIN.

Flanges in different materials: Stainless steels and steels for low temperatures down to cryogenic applications.

Couplings for submersible use including: Cam bolts fitted with O Rings; special paint finish to standards: Primer – Leighs Resistex K570 SS; Top Coat Leighs Jetrone L760B HD Black Bitumastic or similar.

Short Spool Pieces: fitted with a reducer tube between flanges.

Special seal for low temperatures: example: special fluids.

Couplings for hydraulically activated cams.


Specification: 150LB ASA
Weld: BS EN 287/288
Studded: Flange: Steel to BS EN10025A or equivalent
Stud: Stainless Steel BS 970 GR 303
Nut: Stainless Steel GR A2
Slip-on: Flange: Forged Steel: ASTM 105 or equivalent
Weld neck: Flange: Forged Steel: ASTM 105 or equivalent
Short Spool Piece: Flange: Forged Steel: ASTM 105 or equivalent
Tube: Steel: API 5L GR B or equivalent
Cam Block: Cast Steel: BS 3100 GR A2
Cam: Cast Stainless Steel: BS 3100 GR 410C21
Bolt: Steel: BS 970 GR 709M40
Indent Spring: Stainless Steel
Indent Ball: Stainless Steel
Grease nipple: Standard TAT type: Brass
O Ring: Buna N
Locking Bar: Steel: BS 970 GR 070M20

Optional extras

Blanking flange: Aluminium: BS 1490 GR LM6

Locking Wrench: Cast Steel: BS 3100 GR A2

Cam guard/fender: Steel: BS 970 GR 070M20


Camlock Flange Mating Face: Electroless Nickel Plated 0.05mm thick Short Spool Piece standard flange mating face:  Electroless Nickel Plated 0.05mm thick All other external surfaces:   One coat red oxide primer


ASA 150Ib: Units tested to 450 psi for 45 minutes

ASA 300Ib: Units tested to 600 psi for 45 minutes

Maintenance procedure

Check O Rings. Check cams for tightness. Grease shoulder bolts.

Maintenance schedule depends on application and conditions: recommended maintenance schedule 2 to 3 months.

Extras and accessories

Extras and accessories are available. Speak to our technical team for further information.

Stainless steel materials.

Blank flanges: with or without handles.

Special locking wrench.

Lifting lugs.

Fender plus cam bolt seals for submersible application.

Special paint finishes.

The most reliable and efficient couplings in the world.