This European 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 4551:2014 Referenced Document
EN 2424:2008 Aerospace series - Marking of aerospace products
EN 2491:2011 Aerospace series - Molybdenum disulphide dry lubricants - Coating methods
EN 2786:2008 Aerospace series - Electrolytic silver plating of fasteners
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 4560:2003 Aerospace series - Pipe coupling 37 degree, 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 4551:2014 history
2014EN 4551:2014 Aerospace series - Pipe coupling@ 37��in heat resisting steel - Swivel nuts - Inch series
2003EN 4551:2003 Aerospace series - Pipe coupling 37°, in heat resisting steel - Swivel nuts - Inch series