BS ISO 6164:2018 pdf downlaod – Hydraulic fluid power — Four-screw, one- piece square flange connections for use at pressures of 42 MPa, DN 25 to 80

BS ISO 6164:2018 pdf downlaod – Hydraulic fluid power — Four-screw, one- piece square flange connections for use at pressures of 42 MPa, DN 25 to 80 5 Selection criteria The following specifications supplement the dimensional data contained in Tables 1 to 4 with respect to all unspecified details: a) The nominal matching flange size clamp shall be selected for the matching port size from Figures 3 and Table 3. b) The flanged head size, shown in Figure 4 and Table 4, shall be selected in accordance with the size selected for the flange clamps and ports. c) O-rings shall be selected conforming to the dimensions given in ISO 3601-1 and corresponding to the size code in Annex B, Table B.1. d) Metric screws shall be selected corresponding to the sizes and lengths indicated in Table 1. e) Screw type shall be designated according to 4.3 as well as thread size and length of screws. f) Designate square flange connector sizes by the nominal flange size that corresponds to the maximum diameter of the bore through the flanged head. 6 Tolerances 6.1 Unless otherwise specified, tolerances shall be in accordance with ISO 2768-m (medium). 6.2 Dimensions and tolerances given in the tables apply to the finished parts, plated or otherwise processed, as specified by agreement between purchaser and manufacturer. 7 Corrosion protection 7.1 The external surface of all carbon steel flange clamps and all carbon steel flanged heads, except weld-on flanged heads, shall be protected with an appropriate coating to pass a minimum 72 h salt spray test in accordance with ISO 9227, unless otherwise agreed upon by the supplier and purchaser. Weld-on flanged heads shall be protected from corrosion by an oil film, phosphate coating or by other means that do not negatively affect weldability. This protection shall meet or exceed a 16 h neutral salt spray test in accordance with ISO 9227, unless otherwise agreed upon by the supplier and purchaser. 7.2 Screws shall be protected from corrosion by an oil film, phosphate coating, or other means that do not encourage hydrogen embrittlement, to meet or exceed the requirements of a 16 h neutral salt spray test in accordance with ISO 9227. 7.3 Appearance of red rust during the above salt spray tests shall be considered failure, except for in the following locations: — all internal passages; — edges; — areas where the parts are suspended or affixed...