All of SUPERLOK Tube Fittings, design and dimension, are comparable to LEGACY BRANDS like Swagelok® and Parker®. So it is fully interchangeable with these brands. Same form, fit, and function. The Nut and body threads of a SUPERLOK fitting OD are constructed in accordance with ASME B1.1 and the thread tolerances are controlled as specified in ASME B.1.1. This strict tolerance ensures a consistent make-up every time. As proof, we have attached the “SGS intermix-ability & interchangeability burst-test certificate.