1、FORD WORLDWIDE FASTENER STANDARDDate: 1996-10-01Engineering Standards & 1 of 8 Printed copies are uncontrolled .Systems Engineering (ESSE)WD 900APPENDIX BGeneral Specifications for Spaced Thread Tapping ScrewsType Z Cross RecessDimensions and method of penetration gauging.Figure B1. Pan head and rou
2、nd washer head - Penetration depthTable B1. DimensionsDimensions in mmRecess Type ZNominalSizePenetration RecessDiametermDepth ofRecess ERecess andDriver PointNumberMax. Min. Nom. Max.ST2.9 1.75 1.45 3 2.04 1ST3.5 1.9 1.5 4 2.32 2ST4.2 2.35 1.95 4.4 2.77 2ST4.8 2.75 2.3 4.8 3.17 2ST6.3 3.5 3.05 6.8
3、4.07 3FORD WORLDWIDE FASTENER STANDARDDate: 1996-10-01Engineering Standards & 2 of 8 Printed copies are uncontrolled .Systems Engineering (ESSE)WD 900APPENDIX BGeneral Specifications for Spaced Thread Tapping ScrewsType Z Cross RecessDimensions and method of penetration gauging.Figure B2. Raised cou
4、ntersunk - Penetration depthTable B2. DimensionsDimensions in mmRecess Type ZNominalSizePenetration RecessDiametermDepth ofRecess ERecess andDriver PointNumberMax. Min. Nom. Max.ST2.9 2.1 1.8 3.3 2.39 1ST3.5 2.7 2.25 4.9 3.12 2ST4.2 3.1 2.65 5.2 3.52 2ST4.8 3.35 2.9 5.6 3.77 2ST6.3 3.85 3.4 7.2 4.42
5、 3FORD WORLDWIDE FASTENER STANDARDDate: 1996-10-01Engineering Standards & 3 of 8 Printed copies are uncontrolled .Systems Engineering (ESSE)WD 900APPENDIX BGeneral Specifications for Spaced Thread Tapping ScrewsType Z Cross RecessDimensions and method of penetration gauging.Figure B3. Flat countersu
6、nk - Penetration depthTable B3. DimensionsDimensions in mmRecess Type ZNominalSizePenetration RecessDiametermDepth ofRecess ERecess andDriver PointNumberMax. Min. Nom. Max.ST2.9 2 1.6 3.2 2.29 1ST3.5 2.2 1.75 4.3 2.62 2ST4.2 2.5 2.05 4.6 2.92 2ST4.8 3.35 2.6 5.1 3.47 2ST6.3 3.05 3 6.8 4.02 3FORD WOR
7、LDWIDE FASTENER STANDARDDate: 1996-10-01Engineering Standards & 4 of 8 Printed copies are uncontrolled .Systems Engineering (ESSE)WD 900APPENDIX BGeneral Specifications for Spaced Thread Tapping ScrewsType Z Cross RecessDimensions and method of penetration gauging.Figure B4. Type Z Recess - Dimensio
8、nsFORD WORLDWIDE FASTENER STANDARDDate: 1996-10-01Engineering Standards & 5 of 8 Printed copies are uncontrolled .Systems Engineering (ESSE)WD 900APPENDIX BGeneral Specifications for Spaced Thread Tapping ScrewsType Z Cross RecessDimensions and method of penetration gauging.Table B4. Type Z Recess -
9、 DimensionsDimensions in mmRecess No. 1 2 3 4b + 0.0- 0.051.27 1.83 2.72 3.96f + 0.0- 0.0250.74 1.03 1.42 2.16g + 0.0- 0.051.32 2.34 3.86 5.08r 1 max. 0.30 0.38 0.51 0.64r 2 max. 0.13 0.15 0.25 0.38j max. 0.15 0.15 0.20 0.20a + 15- 07 o 5 o 45 5 o 45 7 o + 0- 157 o 45 6 o 20 6 o 20 7 o 45t + 0- 154
10、o 23 3 o 3 o 4 o 23s + 0746 o 46 o 56 o 15 56 o 15NOTE: Minimum dimensions are controlled by the penetrationgauge in Figure B5 and Table B5.FORD WORLDWIDE FASTENER STANDARDDate: 1996-10-01Engineering Standards & 6 of 8 Printed copies are uncontrolled .Systems Engineering (ESSE)WD 900APPENDIX BGenera
11、l Specifications for Spaced Thread Tapping ScrewsType Z Cross RecessDimensions and method of penetration gauging.RECESS PENETRATION GAUGINGThe penetration depth of the gauge shall be measured from the reference plane by using a dial gauge.NOTE 1: The penetration depth of the depth gauge (minimum and
12、 maximum dimensio n) is indicated in Tables B1,B2 and B3 of this appendix. It is the test dimensions for the usability of the cross recess. A typical recess penetrationgauge is shown below.NOTE 2: The point of the gauge is shown in Figure B5 for recess type Z. A sleeve serves to guide the gauge and
13、fixthe reference plane. This plane passes through the point of intersection of the recess wings and the top surface of thescrew head. It corresponds thus to the surface of a screw with flat head. In the case of crowned screw heads, it lies belowthe crown in the transition area from the recess wings
14、to the surface of the head. For these screw heads, the referenceplane is fixed with the help of the bearing surfaces of the gauge sleeve.TYPICAL RECESS PENETRATION GAUGENOTE: The zero and control position of the depth gauge can be found on a flat surface.FORD WORLDWIDE FASTENER STANDARDDate: 1996-10
15、-01Engineering Standards & 7 of 8 Printed copies are uncontrolled .Systems Engineering (ESSE)WD 900APPENDIX BGeneral Specifications for Spaced Thread Tapping ScrewsType Z Cross RecessDimensions and method of penetration gauging.Figure B5. Gauge point for recess type ZFORD WORLDWIDE FASTENER STANDARD
16、Date: 1996-10-01Engineering Standards & 8 of 8 Printed copies are uncontrolled .Systems Engineering (ESSE)WD 900APPENDIX BGeneral Specifications for Spaced Thread Tapping ScrewsType Z Cross RecessDimensions and method of penetration gauging.Table B5. Dimensions of gauge point for recess type ZDimens
17、ions in mmGauge No. 1 2 3 4b max. 1.112 1.702 2.591 3.861min. 1.074 1.664 2.553 3.823f max. 0.698 0.990 1.372 2.083min. 0.673 0.965 1.346 2.057g max. 1.397 2.438 3.962 5.182min. 1.372 2.413 3.937 5.157L max. 3.17 4.78 7.14 8.74P max. 0.166 0.331 0.585 0.788min. 0.153 0.318 0.572 0.775r max. 0.13 0.2 0.31 0.51min. 0.1 0.15 0.2 0.36a 0- 67 o 5 o 45 5 o 45 7 o + 607 o 45 6 o 20 6 o 20 7 o 45t + 604 o 23 3 o 3 o 4 o 23s + 7046 o 46 o 56 o 15 56 o 15d +/- 0.025 2.21 3.58 5.31 7.92
