16 www.stauff.com/2/en/#16 A Catalogue 2 § Edition 03/2024 System Overview 24° Tube Fittings with Single / Double Edge Cutting Ring A C D Components AFitting Body – ISO 8434-1 / DIN 2353 BDouble-Edge Cutting Ring CUnion Nut – ISO 8434-1 / DIN 3870 DTube End B The operating principle of STAUFF Connect 24° Tube Fittings with Cutting Ring is based on a double-edge cutting ring, which cuts into the tube twice, thus ensuring the necessary force and form closure in the cutting area. Thanks to the optimised geometry of this ring, the two edges do not cut simultaneously, but rather one after the other. In addition to increasing the incising effect, this method maximises the tear strength of the fitting. Due to the design of the double-edge cutting ring in the central region as well as in the shoulder area, a larger tube support surface with a high surface pressure is achieved without jamming the cutting ring. This ensures uniform distribution of force. The outer support surfaces of the cutting ring are smoothed, thus minimising friction losses during assembly and guaranteeing the maximum degree of safety during use. Union Nut Fitting Body Cutting Ring Tube End Design AFirst metallic cutting edge BSecond metallic cutting edge COver-assembly protection (max. number of repeat assemblies reached) A B C Features 100% final Assembly Only 30° final tightening after the noticeable increase in force (repeatability significantly) § Increase in process reliability due to lower error potential during final tightening compared to DIN 3859-2 Over-assembly protection (indication of the last possible assembly) Proven 2 cutting edge technology (Metallic sealing) Up to 500 bar in the light series and Up to 800 bar in the heavy series High-quality STAUFF zinc/nickel surface § cuts into stainless steel and serves as an insulator between steel and stainless steel § no contact corrosion § Rust resistance higher than VDMA K5 class (720h according to DIN EN ISO 9227)
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