Tighten clamp from 80 to 85 The trunnion collar is a very resistant collar equipped with a band with raised edges, intended more particularly for applications such as the assembly of thick and reinforced pipes, used for irrigation, drainage, pumping sludge, etc. A hexagonal nut allows the use of standard tools, such as an adjustable wrench, flat wrench or socket wrench. This product is very durable in design with pre-formed welding points. Larger trunnion collars receive three welding points to increase safety. Please note that from the diameter of 48mm, only M8 or higher screws are used to make the installation safer (standard clamp). Very resistant clamps with multiple uses for high pressure and tightening. Necklace in white or dichromate-plated zinc-plated steel. Standard W1 Trunnion Collar: All parts are made of high quality carbon steel and electro-galvanized separately before assembly. Picture showing one of our trunnion necklaces from our range.