Shouldered Couplings Klambon Galvanised Shouldered Couplings are manufactured from SG42 Cast Iron. Couplings up to and including 100NB size have a working pressure of 20 bar, and hydraulic test pressure of 60 bar ( three times working pressure) Couplings 150NB to 250NB have a working pressure of 20 bar and hydraulic test pressure of 40 bar (twice working pressure). Shouldered Fittings Fittings are manufactured from pipe to SABS62 in sizes up to and including 250NB. . Wall thicknesses are as follows: 50NB 3.2mm 80NB 3.5mm 100NB 3.9mm 150NB 4.2mm 200NB 4.5mm In general all fittings are manufactured to comply with SABS 815 with dimensional standards to comply with Australian “Long Series” detail. Working pressure for fittings up to and including 100NB is 20 bar with a test pressure of 60 Bar. For sizes 150NB to 200NB working pressure is 20 bar with a test pressure of 40 bar.