1、 WORLDWIDE FASTENER STANDARDWC900 Date: 2004-09-01 Printed copies are uncontrolled Copyright 2004, Ford Global Technologies, LLC. Page 1 of 1 WC 900 General Specification for Hexagon Head Screw and Conical Spring Washer Assemblies Table 1. Dimensions in mm Nominal Size M4 M5 M6 M8 M10 M12 S Width Ac
2、ross Flats 5.5 5.38 7 6.78 8 7.78 10 9.76 13 12.73 15 14.7 e Width Across Corners 6.35 6.03 8.08 7.59 9.24 8.71 11.55 10.93 15.01 14.26 17.32 13.46 k1)Head Height 3 2.7 4 3.7 5 4.7 6.2 5.8 7.1 6.6 8.85 8.25 k Wrenching Height (Min.) 2 2.7 3.4 4.2 4.8 5.95 1) Embossed head markings (See WA950) are ex
3、cluded from head height measurement but must not protrude more than 0.4. 2) a max. shall be the free height of the assembled washer (See WF900) plus 2 pitches. Dimensions Head dimensions shall conform to Table 1 and Figure 1. The diameter of the plain shank (unthreaded portion) must be such to allow the washer to rotate, while no disassembly of the screw and washer is permissible. Initial washer adhesion is allowable per the WX100.
