1、 WORLDWIDE FASTENER STANDARD Date: 2001-01-04 WD 900 APPENDIX C General Specifications for Spaced Thread Tapping Screws Printed copies are uncontrolled. Page 1 of 2 Copyright 2001, Ford Global Technologies, Inc. Countersunk Head Screws Head configuration and gauging Figure C1. Head configuration Tab
2、le C1. Dimensions in mm Thread Size ST2.9 ST3.5 ST4.2 ST4.8 ST6.3 dkTheoretical max. 6.3 8.2 9.4 10.4 12.6 min. 5.9 7.7 8.9 9.8 11.9 dkActual max. 5.5 7.3 8.4 9.3 11.3 min. 5.2 6.9 8 8.9 10.9 F max. 0.2 0.25 0.25 0.3 0.35 k max. (ref) 1.7 2.35 2.6 2.8 3.15 WORLDWIDE FASTENER STANDARD Date: 2001-01-0
3、4 WD 900 APPENDIX C General Specifications for Spaced Thread Tapping Screws Printed copies are uncontrolled. Page 2 of 2 Copyright 2001, Ford Global Technologies, Inc. Countersunk Head Screws Head configuration and gauging Figure C2. Gauging method The top surface of the screw head must lie between
4、gauge surfaces A and B. Table C2. Dimensions in mm Thread Size ST2.9 ST3.5 ST4.2 ST4.8 ST6.3 D max. 6.3 8.2 9.4 10.4 21.6 min. 6.25 8.15 9.35 10.35 12.55 damax. 3.3 3.9 4.4 5.5 6.6 min. 3.2 3.8 4.3 5.4 6.5 F max. 0.2 0.25 0.25 0.3 0.35 min. 0.19 0.24 0.24 0.29 0.34 dhmin. 5.18 6.88 7.98 8.88 10.88 max. 5.2 6.9 8 8.9 10.9
