1、STANDARD PARTS SE(;TION D TABLE OF CONTENTS PAGE Hexagon Washer Head Tapping Screws Type A Types B T2, md 3, show recess dimensions for screws over 1 - inch in length. (Part Numbers show below the solid line.) Mer specifications applicable to the lbove parts are show on the following pages: Mater* E
2、SS-MlAlGO-A For 5nisbes nee Finish Sectlm. - Page AA-llO.01 Screws longer than 8 pitches in length (Part Numbers show below double line) shall have a taper lee “Z“ of 3-1/2 to 4-1/2 tunes the pitch diSance. Screws 8 pitches or shorter in length (Part Numbers shown above double line) Stainless Steel
3、- ESS-MlA165-A Recommended Hole Sizes Page D-950,09 *The suffix S, with or without a finish numeral, makes these part numbers complete. Example description for a #4-24 Pan Head type AB tapping screw shown this page is: 56004-5 SCR #4x.2 PAN Hb PAGE D-153.04 Product Engineering DEC 1991 FORD MOTOR CO
4、MPANY PRODUCT ENGINEERING 0 STANDARD PARTS TAPPING SCREWS - TYPE AB ROUND WASHER HEAD TYPE 1 CROSS RECESSED CATEGORY 080.08OP N SCREW SIZE AND THREAD II 8-18 Recess Dimensions Head Dimensions *Ford Part Number M T - L Dkiver Size II #2 Recess Dia. Recess Depth .182-. 195 ,104-. 127 Recess Penetratio
5、n II .093-. 116 Width Min. Radius Min. .032 .040 Radius Max. .036-. 051 Washer Thickness . 107-. 120 Head Height .310-. 322 Head Diameter .025 Washer =le Narr. I Wide Washer Diameter .25 .38 .50 .62 .75 I .88 I 1.00 .380 .358 56900 56901 56902 56903 56904 56905 56906 .500 .478 56910 56911 56912 5691
6、3 56 9 14 1.25 1.50 1.75 56907 56908 56909 56915 56916 56917 Further specifications applicable to the above parts are shown or identified on the following pages : Head Data: General Specifications only Page AA-140.41 Thread, Body, Point and hngth Data I Page AA-125.01-. 03 Material: ESS-MlA16OA Reco
7、mmended Hole Size (for reference only) Page D-950.06 * The suffix S with or without a finish numeral makes the part numbers complete. DEC 1991 PRINTED IN U.S.A. PAGE D-173.01 FORD MOTOR COMPANY PRODUCT ENGINEERING STANDARD PARTS TAPPING SCREWS - TYPE B ROUND WASHER HEAD TYPE 1 CROSS RECESSED L Part
8、Number ND THREAD 8-18 Driver Size #2 Recess Dia. .182-. 195 Recess Depth .104-. 127 Recess Penetration .093-. 116 Width Min. .032 Radius Min. .025 Head Diameter .310-. 322 He ad Height .107-. 120 Washer Thickness .036-. 051 Radius Max. .040 Washer Style Narr. I Wide Washer Diameter .380 .500 ,358 47
9、8 .25 .38 .50 .62 .75 .88 1.00 56918 56919 5692 0 56921 56922 56923 56924 56 92 8 56929 56930 56931 56932 1.25 1.50 1.75 5692 5 56 92 6 5692 7 56933 56934 56935 Further specifications applicable to the above parts are shown or identified on the following pages: Head Data: General Specifications only
10、 Page AA- 140.41 Thread, Body, Point and Length Data Page AA-125.01-. 03 Material: ESS-MlA16OA Recommended Hole Size (for reference only) Page D-950.06 * The suffix S with or without a finish numeral makes these part num- bers complete. PAGE D-173.02 PRINTED IN U.S.A. DEC 1991 Standard Parts DRIVE S
11、CREWS-TYPE U ROUND HEAD CATEGORY 110.070 Soe Not0 (b) DEC 1991 Product Engineering PAGE D-260.01 FORD MOTOR COMPANY PRODUCT ENGINEERING STANBARD PARTS HOLES FOR THREADED FASTENERS PURPOSE The purpose of this standard is to impart general design knowledge and accepted shop prac- tice required in the
12、application of tapping screws. THREAD FORMING SCREWS. For application in materials where large internal stresses are permissible or desirable to increase resistance to loosening and chips from threading would be objectionable tapping screws shall be of the following types: TYPE B. Spaced thread scre
13、w with pitches generally somewhat finer than type A with a blunt point for light and heavy sheet metal, non-ferrous castings, plastics, resin impregnated plywood, asbestos compositions, etc. TYPE AB. Spaced thread screw with same pitch as type B and a gimlet point, for use in metal, resin impregnate
14、d plywood, and asbestos composition. TYPE BP. Spaced thread screw, the same as type B but having a cone point, used primarily in assemblies where holes are misaligned, etc. THREAD CUTTING SCREWS. For application where the material being threaded is too brittle for the use of thread forming screws an
15、d ease of driving is desirable. Thread strength is usually lower than that of thread forming screws. Thread cutting screws shall be of the following types: TYPES F, G, D and T. Thread cutting screws with threads approximating machine screw threads, with blunt point and with tapered entering threads
16、having one or more cutting edges and chip cavities. The tapered threads may be complete of incom- plete at the producers option; these screws can also be used in materials such as aluminum, zinc and lead die castings, steel sheets and shapes, cast iron, brass, plastics etc. (CONTINUED) PAGE D-950.06
17、 PRINTED IN U.S.A. MAR 1970 FORD MOTOR COMPANY PRODUCT ENGINEERING HOLES FOR THREADED FASTENERS (Contd. ) POSITIONING OF PIERCED HOLES. Minimum distances as shown in Figure 1 are required from a drawn hole to bends, edges, and other drawn holes in order to avoid distortion of holes. Wherever possibl
18、e, the minimum distance between the edge of a drawn hole and the inside edge of the closest bend should be three (3) times the thickness of the metal plus the inside radius of the bend but not less than 1/32 plus the inside radius of the bend. Where no bends exist, minimum distance between a drawn h
19、ole and edge of metal should be at least three (3) times the thickness of the metal, but not less than 1/16 inch. Minimum distance between drawn holes should be not less than six (6) times the thickness of the metal. T 3T MIN. . a Figure 1 FLANGE DIMENSIONS FOR EXTRUDED HOLES. Figures 2 and 3 apply
20、to extruded holes in low carbon sheet stock .025 to .312 thick; 50-70 Rockwell B. These dimensions are for flanged holes produced by a shoulder-type punch. First, a small hole is produced by the flat end of the punch and then this hole is enlarged to the desired size by the body of the punch. The me
21、tal flows into the die opening producing a projection with a reasonably smooth edge. USE OF EXTRUDED HOLES. It is advisable to limit the use of extruded holes to material thicker than 1/5 the nominal diameter of the screw so there will be enough strength in the extruded hole to develop a reasonable
22、proportion of the strength of the screw. In other words. avoid using screws larger than 5 times the material thickness. Screws in extruded holes in thin material develop twice as much fastening strength as could be developed with the unextruded plate. At the other extreme the full strength of the th
23、read forming screw can normally be de- veloped with a drilled or clean punched hole when the material thickness exceeds 75% of the screw diameter making extrusion unnecessary. Use only thread forming screws or thread forming taps with extrusions because thread cutting screws and thread cutting taps
24、cut away so much of the thin wall of the extrusion that the strength of the fastening is impaired. (CONTINUED) MAR 1970 PRINTED IN U.S.A. PAGE D-950.07 FORD MOTOR COMPANY PRODUCT ENGINEERING STANDARD PARTS e HOLES FOR THREADED FASTENERS (Contd. ) FLANGE. DIMENSIONS Figure 2 Minimum Extrusion Thickne
25、ss W Nominal Thickness Flange W Min. Metal .125 .I18 .lo6 .090 .075 .060 -053 -048 .041 .035 -032 .030 .026 .024 Thickness .062 .OS9 -0% .045 .037 .030 .026 .024 .020 .017 .016 .015 .013 .012 Figure 3 PAGE D-950.08 PRINTED IN U.S.A. MAR 1970 FORD MOTOR COMPANY PRODUCT ENGINEERING a STANDARD PARTS AP
26、PROXIMATE HOLE SIZES FOR TAPPING SCREWS TYPE B TYPE AB TYPE BP IN SHEET METALS r Steel, Stainless Steel, Monel, Brass Pierced or Extruded Drilled or Clean- Punched Hole Diameter Diameter Size No. Metal Screw Metal Size Thiclmess 0.015 0.018 0.024 2 0.030 0.036 0.048 0.060 0.015 0.018 0.024 4 0.036 0
27、.030 0.048 0.060 0.075 0.105 Aluminum Alloy Pierced or Extruded Punched Hole. Hole Drllled or Clean- t I Diameter Hole Dlameter Hole Drill Slze No. 52 52 52 51 50 44 44 44 43 43 42 37 37 37 36 35 34 31 33 33 32 31 30 29 29 32 31 30 29 . 0.064 52 . 0.064 52 . 0.067 51 . 0.070 50 . 0.073 49 . 0.073 49
28、 . 0.076 48 0.086 0.086 44 0.086 0.086 44 0.098 0.089 43 0.098 0.094 42 0.098 0.094 42 . 0.096 41 . 0.100 39 . 0.102 38 . . . . . . . . 0.064 0.070 . 0.067 . 0.064 . 0.064 . . . . 0.086 0.086 0.086 0.086 0.088 0.086 0.086 . 0.094 . 0.089 . 0.089 . 0.111 0.111 0.111 0.111 0.111 . . . . . 0.104 0.104
29、0.106 0.106 0.110 0.111 0.116 0.120 0.128 . 37 37 36 36 35 34 32 31 30 0.015 0.018 0.024 0.030 0.036 6 0.048 0.060 0.075 0.128 to 0.105 0.250 . . . . 0.111 0.104 0.111 0.104 0.111 0.104 0.111 . 0.111 . 0.110 . 0.106 . . 0.120 0.120 0.120 0.120 0.120 0.120 . . . . 0.116 0.116 0.116 0.116 0.120 0.128
30、0.136 0.140 . 32 32 32 32 31 30 29 28 0. e18 0.024 0.030 0.036 0.048 0.060 0.075 0.128 to 0.105 0.250 7 . . . 0.120 0.120 0.113 0.120 0.113 0.120 0.116 . 0.136 . 0.128 . 0.120 . 0.136 0.136 0.136 0.136 0.136 0.136 . . 0.125 0.125 0.125 0.128 0.136 1/8 1/8 l/8 30 29 0.018 0.024 0.036 0.030 0.048 0.06
31、0 8 . . 0.136 0.116 0.136 . 0.136 . 0.128 0.136 0.120 0.136 NOTE. Because conditions differ widely, It may he necessary to vary the hole slze to suit a partlcular appllcatlon. The hole slzes tabulated above represent recommendations based on practical experience of screw producers and users as prese
32、nted in Amerlcan Standard ASA B18.6.4 and are not lo he misconstrued as king a part of the tapping screw specificatlons. Hole Slzes shown for metal thickness greater than 0.075 are recommended for types B and BP only. Hole Tolerance +O. 001, -0.003 MAR 1970 PRINTED IN U.S.A. D-950.09 FORD MQYOR COMP
33、ANY PRODUCT ENGINEERING STANDARD PARTS 0 APPROXIMATE HOLE SIZES FOR STEEL TYPES AB, B AND BP THREAD FORMING SCREW5 (continued) IN SHEET METALS (continued) -r 1 Steel. Stainless Steel, Monel. Brass Aluminum Alloy r Pierced or ExLruded Hole Pierced or ExLruded Hole Hole Diameter . . . . . 0.157 0.157
34、0.157 0.157 0.157 . . . . . . . 0.185 0.185 0.185 0.185 . . . . . . . 0.209 0.209 0.209 . . . . . -.-.- . . . Drilled or Clean- Punched Hole* Drilled or Clean- Punched Hole Diameter Hole Diameter Hole Dlameter Hole 0.140 0.147 0.141 0.149 0.152 . . . 0.144 0.144 0.144 0.147 0.147 0.154 0. I54 0.159
35、3.166 . . . 0.161 0.166 0.173 0.180 0.182 0.182 0.189 0.196 . . . 0.199 0.201 0.204 0.209 0.209 0.213 0.213 0.221 0.228 Drill Size No. 28 26 25 26 24 27 27 27 26 26 23 21 23 I 19 20 19 17 15 14 14 12 9 8 7 6 4 4 3 3 2 1 Size No. Drill 28 25 25 24 27 27 26 24 24 22 20 18 . 17 18 19 19 19 18 16 14 13
36、9 9 7 10 10 10 8 6 4 1 1 15/64 15/64 15/64 0.140 0.150 0.150 0.152 . . . . . . 0.075 0.105 0.125 0.162 to 0.135 0.375 0.018 0.024 0.030 0.036 0.048 0.060 10 0.075 0.105 0.125 0.135 0.164 0.200 to 0.375 8 . 0.144 0.144 0.147 0.152 0.151 0.152 0.161 0.170 0.170 0.173 . . 0.157 0.157 0.157 0.157 . . .
37、. . . . 0.024 0.030 0.036 0.048 0.166 0.166 0.166 0.170 0.177 0.182 0.185 0.196 0.196 0.201 . . . . . . . . . . . . I 0.060 0.075 0.105 12 0.125 0.135 0.200 to 0.164 0.375 0.030 0.036 0.048 0.060 0.075 0.105 0.125 0.135 0.164 0.181 0.200 to 0.194 0.315 0.194 0.194 0.194 0.199 0.204 0.228 0.209 0.228
38、 0.234 0.234 0.234 . . . . . . . . . . . 1/4 . . NOTE: Because conditions differ widely, it may be necessary to vary the hole size to suit a particular applicabon. The hole snes tabulated above represent recommendations based on practical experience of screw producers and users as presented in Ameri
39、can Standard ASA B18.6.4 and are not to be misconstrued as being a part of the tapping screw specifications. * Hole sizes show for metal thickness greater than 0.075 are recommended for tyuer B and BP only Hole Tolerance +O. 001, -0.003 D-950.10 PRINTED t N U.S.A. DEC 1968 FORD MOTOR COMPANY PRODUCT
40、 ENGINEERING e STANDARD PARTS APPROXIMATE HOLE SIZES FOR STEEL TYPES AB, B AND BP THREAD FORMING SCREWS (continued) IN PLYWOODS (RESIN IMPREGNATED) Screw Size 2 4 6 7 8 10 12 1 /4 Hole Diameter 0.073 0.100 0.125 0.136 0.144 0.173 0.194 0.228 Compreg, Pregwood, Etc. Material Drill Size Thickness No.
41、Min. * 49 0.125 39 0.188 1 /8 0.188 29 0.188 27 0.188 17 0.250 10 0.312 1 0.312 IN ASBESTOS COMPOSITIONS Penetration in Blind Holes* Min. 0.188 0.250 0.250 0.250 0.250 0.312 0.375 0.375 Max. 0.500 0.625 0.625 0.750 0.750 1.000 1.000 1.000 Screw Size 2 4 6 7 8 10 12 1 /4 Transite, Ebony Asbestos, Etc
42、. Material Blind Holes* Thickness Drill Size Hole Penetration in Diameter No. Min. * Max. Min. 0.076 0.625 0.250 0.188 31 0.120 0.625 0.250 0.188 38 0.101 0.500 0.188 0.125 48 0.136 29 0.250 0.312 1.000 0.375 0.312 9 .O. 196 1.000 0.375 0.312 19 0.166 0.750 0.375 0.312 26 0.147 0.750 0.228 1 0.438 0
43、.500 1.000 NOTE: Because conditions differ widely, it may be necessary to vary the hole size to suit a particular application. The hole sizes tabulated above represent recommendations based on practical experience of screw producers and users as presented in American Standard ASA B18.6.4 and are not
44、 to be misconstrued as being a part of the tapping screw specifications. * Based on full thread engagement through the entire material with the tapered portion * Total length of thread in engagement. of the screw projecting completely. Hole Tolerance +0.001, -0.003 MAR 1969 PRINTED IN U.S.A. D-950.1
45、1 FORD MOTOR COMPANY PRODUCT ENGINEERING STANDARD PARTS e APPROXIMATE HOLE SIZES FOR STEEL TYPES B AND BP THREAD FORMING SCREWS (continued) IN CAST METALS Aluminum, Magnesium, Zinc, Brass, Bronze Minimum Screw in Blind No - Diameter Size Penetration Drill Size Hole Holes* 2 0.250 30 0.128 6 0.188 37
46、 0.104 4 0.125 47 0.078 7 0.144 27 0.250 8 0.250 24 0.152 10 0.250 16 0.177 I 12 0.281 I 8 0.199 1 1/4 0.312 15/64 0.234 IN PLASTICS Phenol Cellulose Acetate, Cellulose Nitrate Plastic Acrylic Resin, Styrene Resin Formaldehyde Minimum Penetration Drill Size Hole Penetration Drill Size Hole Screw Min
47、imum in Blind No. Diameter in Blind No. Diameter Size Holes* Holes* 2 0.250 31 0.120 0.250 30 0.128 6 0.250 42 0.094 0.250 39 0.100 4 0.188 47 0.078 0.188 47 0.078 7 0.136 29 0.250 0.375 11 0.191 0.375 8 0.199 12 0.312 18 0.170 0.312 16 0.177 10 0.312 27 0.144 0.312 25 0.150 8 0.250 30 0.128 1 /4 0.
48、234 15/64 0.375 0.221 2 0.375 NOTE: Because conditions differ widely, it may be necessary to vary the hole size to suit a particular application. The hole sizes tabulated above represent recommendations based on practical experience of screw producers and users as presented in American Standard MA B18.6.4 and are not to be misconstrued as being a part of the tapping screw specifications. * Total length of thread in engagement. Hole Tolerance + 0.001, - 0.003 D-950.12 PRINTED IN U.S.A. DEC 1968
