Sockets and reducing sockets, round
Threaded fittings
Round sockets join two pipe ends or nipples of the same thread size, while reducing sockets step down to the next smaller size. Both carry a female thread on each end and have a plain cylindrical body without wrench flats. The range covers 87 versions with threads from G 1/4" to G 2", respectively Rp 1/2" to Rp 2".
Thread size, material and nominal pressure govern the choice. Brass covers the standard range up to PN 16 bar, galvanised malleable iron reaches PN 25 bar, and stainless steel 1.4408 handles aggressive fluids. Thread form G or Rp has to match the mating part, because parallel and tapered pairings seal in different ways.
Extension and size adaptation in compressed air networks, water and cooling lines, and general pipework in plant engineering. Reducing sockets bring smaller bore devices onto an existing main line, for example pressure gauges, shut-off cocks or measuring ports. Versions in 1.4408 are used wherever brass would be attacked by the fluid.
