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Click here to go to "Bevel Seat Unions" 

Bevel Seat Unions
Bevel Seat Fittings are mainly used on processing equipment to ensure a rigid system. Bevel seat unions are comprised of a threaded bevel ferrule mated with a plain bevel ferrule, which are then joined with a 304 hex-nut. Gaskets are not required for positive shut-off of Bevel Seat Unions.

Click here to go to "Blank Caps" 

DIN Blank Caps
DIN blank caps function just like Tri Clamp End Caps, but for the DIN standard. They fit into the welding male with a gasket, and have the same bevel as welding liner but are solid. Unlike the welding male or liner, blank caps are not welded and thus do not need an imperial inch-based size. They simply fit into their respective (25mm, 40mm, etc...) metric counterpart. The round nut then presses the blank cap and welding male together compressing the gasket and forming a tight seal.

Click here to go to "Gaskets" 

DIN Gaskets
DIN gaskets are designed specifically for DIN fittings. The underside of the gasket is flat and butts up against the welding liner's flat face, while the top side has a rounded edge which fits nicely into the groove of the welding male. The round nut then joins the liner and male compressing the gasket creating a tight seal. Gaskets are matched to other DIN fittings based on the metric sizing (Ie: A 40mm gasket is used for any DIN fitting that is 40mm, including any Imperial (inch-based) fittings that are also listed as 40mm).

Click here to go to "Round Nuts & Wrenches" 

DIN Round Nuts
DIN round nuts fit over the threads of the welding male, and secure the welding liner and gasket inside the welding male. A DIN wrench is used to tighten the nut by hooking the wrench into the round nut grooves and turning in a clockwise direction. Round nuts are combined with other same DIN fittings based on the metric size.

DIN Wrenches
DIN wrenches hook into the grooves on the round nut and allow the nut to be fully tightened following hand tightening. While the DIN wrenches may overlap in size, it is generally recommended to use a 3 - 6 in. spanner wrench for nuts 80mm or larger.

Click here to go to "Welding Liners" 

DIN Welding Liners
DIN welding liners make up one side of a DIN union and fit into the welding male with a gasket of choice. The round nut then presses the welding liner and welding male together compressing the gasket and forming a tight seal.

Understanding DIN fittings
DIN 11851 fittings are used extensively throughout Europe and the UK, and as such are the most common European fittings encountered in the US. A complete DIN union consists of a slotted DIN round nut, a threaded welding male, a gasket and welding liner. The welding male and welding liner are available in both Imperial and metric tube sizes, however the threads of the welding male and round nut are always measured in metric (mm) sizes. The most common points of confusion are two fold:

  1. The welding liner fits into the welding male, thus the liner acts 'male' and the male 'female', but it is the welding male that fits inside the round nut.
  2. DIN fittings are sized together via their metric measurement, but the liner and male tube size is available in both metric and imperial. Thus in the US, imperial males and liners are commonly welded onto inch-based tubing. Example: To use 1.5 inch tubing, we would weld onto a 1.5 in. (40mm) welding liner and/or welding male. These would be joined via a 40mm gasket and round nut.
Click here to go to "Welding Males" 

DIN Welding Males
DIN welding males make up one side of a DIN union and fit over the welding liner and gasket of choice. The round nut then presses the welding male and welding liner together compressing the gasket and forming a tight seal.

Understanding DIN fittings
DIN 11851 fittings are used extensively throughout Europe and the UK, and as such are the most common European fittings encountered in the US. A complete DIN union consists of a slotted DIN round nut, a threaded welding male, a gasket and welding liner. The welding male and welding liner are available in both Imperial and metric tube sizes, however the threads of the welding male and round nut are always measured in metric (mm) sizes. The most common points of confusion are two fold:

  1. The welding liner fits into the welding male, thus the liner acts 'male' and the male 'female', but it is the welding male that fits inside the round nut.
  2. DIN fittings are sized together via their metric measurement, but the liner and male tube size is available in both metric and imperial. Thus in the US, imperial males and liners are commonly welded onto inch-based tubing. Example: To use 1.5 inch tubing, we would weld onto a 1.5 in. (40mm) welding liner and/or welding male. These would be joined via a 40mm gasket and round nut.
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