SUPERLOK Tube Fittings are designed with the same form, fit, function and dimensions as Swagelok and Parker. Superlok Tube Fittings will seamlessly interchange with these brands, while dramatically reducing cost and maintaining the quality our customers demand. Leak-free connection under various tests such as temperature cycling, vibration, hydro static, tensile, etc. The Nut and body threads on a SUEPRLOK fitting's OD are constructed in accordance with ASME B1.1 and the thread tolerances are controlled as specified in ASME B.1.1. This tolerance ensures consistent make-up every time. Upon request we can provide the “SGS intermixability & interchangeability burst-test certificate."