This standard specifies the characteristics of swivel nuts for inch series pipe couplings, 37°, in heat resisting steel, for aerospace applications. Nominal pressure: Class D in accordance with ISO 6771.
EN 4552:2015 Referenced Document
EN 2424:2008 Aerospace series - Marking of aerospace products
EN 3487:2007 Aerospace series - Steel FE-PA3601 (X6CrNiTi18-10) - Air melted - Softened - Bar for machining - a or D Less than or euqal to 250 mm - 500 MPa Less than or euqal to Rm Less than or euqal to 700 MPa*， 2024-04-20 Update
EN 4549:2014 Aerospace series - Pipe coupling@ in heat resisting steel or in heat resisting nickel alloy - Coupling end@ welded - Design configuration - Inch series
EN 4550-1:2014 Aerospace series - Pipe coupling@ 37�� Design configuration - Inch series - Part 1: Male sealing ends@ spherical
EN 4560:2015 Aerospace series - Pipe coupling 37°, spherical up to 21000 kPa - Inch series - Technical specification
ISO 3161:1999 Aerospace - UNJ threads - General requirements and limit dimensions
ISO 6771:2007 Aerospace - Fluid systems and components - Pressure and temperature classifications
EN 4552:2015 history
2015EN 4552:2015 Aerospace series - Pipe coupling 37��spherical@ in heat resisting steel - Straight nipples@ welded end - Inch series
2003EN 4552:2003 Aerospace series - Pipe coupling 37? spherical, in heat resisting steel - Straight nipples, welded end - Inch series