DIN Short-End Complete Union Assembly

Short-Neck Complete Union Construction

The DIN Short-End Union Assembly is a complete four-piece joint consisting of a slotted round retaining nut, a short-neck welding liner, a short-neck welding male end, and an elastomeric union seal.

Compared with long-neck or expanding-end DIN unions, the short-end weld collars provide a shorter axial envelope while maintaining the DIN round-thread (RD) coupling interface.

Material Options & Short End-Piece Dimensions

Source specifications list SS304 and SS316L (AISI 304 and AISI 316L) with a surface finish of Ra < 0.8 μm across nine nominal sizes from DN15 to DN100.

On the composite drawing, both the DIN Short welding male and DIN Short welding liner tables span DN15 (bore A = 16 mm, tube OD B = 19 mm) to DN100 (bore A = 100 mm, tube OD B = 104 mm), with male heights F = 17–30 mm, threads C = RD34×1/8 to RD130×1/4, and liner heights F = 13–20 mm.

Hygienic Process Applications & Maintenance

Used for detachable pipe connections across dairy, food, beer, beverage, fruit juice, and pharmaceutical lines, the union assembly allows sections of pipework or inline equipment to be removed without cutting tubing.

Releasing the slotted round nut provides immediate access to inspect and replace the union seal ring during routine maintenance.