Parker 316 Stainless Steel Back Ferrule for 5/8 in. Parker Tube Fitting. The ferrule, perhaps the most-critical component in compression fittings, is highly engineered and, to function properly requires considerable design, metallurgy, and production expertise. Not all products on the market meet these stringent requirements. The ferrule must precisely deform elastically and plastically during fitting assembly to properly grip and seal the tubing. Its Back edge must be harder than the tubing to grip and seal through surface scratches and defects, but if the entire ferrule is too hard, it may not deform properly. Therefore, only the gripping edge of the ferrule is hardened while the rest has different, tightly controlled mechanical properties. Also, the hardening process must not compromise stainless steel's corrosion resistance. And finally, production processes must consistently turn out defect-free ferrules that hold tight tolerances and maintain metallurgical specifications.
Equipped with Parker Suparcase® this ferrule yields superior tube connection integrity and holding power to higher pressures without compromising the exceptional corrosion resistance of the various alloys. The Parker Suparcase® ferrule hardening process is unique in this regard; Parker has the only dedicated facility for performing this process for fittings in the world. Traditional hardening processes substantially reduce the corrosion resistance of the hardened region. As a consequence other fittings may experience corrosion problems in harsh environments, or they may utilise unhardened ferrules, which reduces their pressure ratings or cause the tubing to detach itself from the assembly with time due to hard tubing, temperature cycling, vibration or pressure surges and cycling.
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