GMNA-VOL-I-SEC-D-2.701-1966.pdf
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1、 V N D - G M VOL I SEC D-ENGL LSbb D 700b379 0011055 993 M 42 32 28 24 20 GENERAL MOTORS ENGINEERING STANDARDS .125 -120 .125 .120 .187 .181 .187 .181 .187 .181 HEXAGON HEAD TAPPING SCREWS TYPES AB, B, BF. BP AND ET .134 .134 .202 .202 .202 .O50 .O36 - - .O50 .O40 - - .O55 .O44 - - .O60 .O49 .O31 .O
2、39 .O70 .O58 .O35 .O43 20 19 18 16 14 14 12 12 .250 .244 .250 -244 .250 ,244 .312 -305 .312 .305 .375 .367 .500 -489 .562 .551 ! T See Gen Spec SLOT MAY BE AT RANDOM TO HEXAGON FLATS JAJk SLOTTED HEAD INDENTATION OPTIONAL TYPE 0 L/USE AND SHAPE OF 50. TYPE AB TYPE BF TYPE 0P TYPE BT T I Ut 1 Vt I TH
3、READ DETAIL I l I 1 E H l p - EICIHIJ R Nominal Size* or Basic Screw Diameter I Head I Slot I Slot Corners Height Width Depth Fillet Radius Min I Max 1 Min 1 Min 1 Max 1 Min 1 Max Ei .o11 .O13 .O15 .O17 .o19 .o21 .O23 .O25 .O28 .O32 .O38 .O47 .O56 1 .O730 2 .O860 3 .o990 *4 .1120 5 .1250 .O25 .O36 1
4、 . 0 3 0 1 . 0 4 2 6 .1380 7 .1510 (8 .1640 *lo .1900 12 .2160 *1/4 .2500 5/16 .3125 3/8 .3750 * Freferrf .O83 -143 .179 .152 .145 .215 .209 .164 .157 .lo3 .143 .179 .179 .171 .246 .240 .192 .185 .125 .167 .208 .230 .222 ,315 .308 .244 .236 .162 /IlII/ .167 .208 .293 .285 .380 .371 .309 .299 sizes.
5、Where specifying nominal size i n decimals, zeros i n fourth decimal place shall be omitted. * Short i f gth tapping screws shall have shorter point as specifled i n the General Specifications. Types AB, B, BF, BP and ET Hexagon Head Tapping Screws must conform to General Specifications below. Taper
6、ed point dimensions are not applicable to Type AB screws. -.-_-. GtNtKAL SPECIFICATIONS General: This standard conforms i n all essentials with the tabulated values f o r “T“. See illustration below: m n d a r d and the American Standard for Hex Head and Slotted Hex Head Tapping Screws. +.O003 Heads
7、: The perimeter a t top of head shall be chamfered or slightly rounded. l a r to axis of screw within 2 . Taper on sides of hexagon (angle between one side and the axis) shall not exceed 2 or .O04 inch, whichever is greater, the specified width across flats being the largest dimension. A slight roun
8、ding of all edges and corners of indented or fully upset heads shall be permissible providing the diam- eter of the bearing circle is not less than 90 per cent of the minimum width across flats dimension. The rounding due t o lack of fill on a l l six corners of head shall be reason- ably uniform an
9、d the width across corners shall be such that where a sharp ring having an inside diameter equal to the specified minimum width across corners is placed on the top and bottom of head, normal to axis of screw, the head shall protrude a distance equal to, or greater than, the The bear19 surface shall
10、be perpendicu- SHARP -.o000 C E DIA- r THICKNESS OPTION- MUST EE AL, SIDES PARALLEL CORNERS LOAGING RING CJ Slot Depth: The depth of slot i n slotted heads shall be measured, parallel to axis of screw, from the top of head to the intersection of bottom of slot w i t h head surface. Depth throughout
11、the indented portion of upset heads shall not be less than one-third of tabulated minimum slot depth. (Continued on following page) These specificaflons were developed without considering whether patents may or may not be involved. fore, the supplier shall be required to assume patent liability. In
12、a l l cases, there- Printed in U S A ENCRC STDS PAGE D-2.701 AUGUST, 1966 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/24/2008 01:07:39 MDTNo reproduction or networking permitted without license fro
13、m IHS -,-,- GENERAL MOTORS ENGINEERING STANDARDS Type AB and BP HEXAGON HEAD TAPPING SCREWS TYPES AB, 8, BF, BP AND BT GENERAL SPECIFICATIONS Nominal Screw Length Tolerance on Length U p t o 1 inch, Incl ?.O3 Over 1 inch +.O5 kCont1;ued y: ccentricit screw Y more than 3 Der cent of the maximum width
14、 across The head shall not be eccentric with axis of ; % 4 11/64 3/16 3/16 7/32 17/64 9/32 21/64 3/8 13/32 17/32 - 11/64 13/64 1/4 5/16 21/64 25/64 15/32 31/64 9/16 21/32 3/4 53/64 29/32 U p t o 3/4 inch, Incl -.O3 -.O5 Over 1-1/2 inch 1 -.O6 a;ldBL Over 3/4 t o 1-1/2 inch, Incl 5/64 7/64 9/64 9/64
15、5/32 11/64 3/16 3/16 15/64 9/32 Short Length Screws: Screws of nominal lengths equal to or shorter than “ 1 “ for Types B, BF and E ; and lL2 for Type BP; shall have tne length of tapered point reduced as speci- fied in Table 1. Screws having shorter nominal lengths than the “Lp“ lengths listed i n
16、Table 1 for the various types are impractical. Threads: Screws shall have spaced 1 OAT threads. Thread form shall be as shown opposite. The width of f l a t a t crest of thread shall not exceed .O04 inch for size 8, or smaller, and .O06 inch for larger sizes. Length of Thread: For screws of nominal
17、lengths equal to form threads shall extend close to head such that speci- fied minor diameter limits are maintained t o within one pitch (thread) of the underside of the head, or closer i f practicable. Screws of longer nominal lengths shall, un- less otherwise specified, have a minimum length of fu
18、ll form thread equal to 6 diameters or 1.50 inches, which- EUS diameters or 1-1/2 inches, whichever is shorter, the full .O36 .O48 .O91 .133 .145 .O47 .O62 .119 .174 .190 .O54 .O71 .139 .202 .220 .O63 .O83 .160 .233 .254 .O75 .lo0 .179 .264 .289 .O75 .lo0 .193 .281 .306 .O79 .lo5 .211 .306 .333 .O83
19、 .111 .224 .324 .352 .O94 .125 .256 .371 .402 .lo7 .143 .296 .429 .465 ever is shorter. TABLE I 1 2 3 4 5 6 7 8 10 12 1/4 5/16 3/8 - * NO1 t Noi 5/64 7/64 9/64 3/16 3/16 1/4 5/16 5/16 ; $ 6 1/2 1/2 1/2 - Constant * Minimum Point Practical Taper “I Bp“ I a controlling limit applicable t o Type i 9/32
20、 .lo7 .143 .335 .478 .514 5/16 .125 .167 .418 .592 .634 5/16 1.125 1.167 I - 1.706 1.747 ion on product. I screws. Effective Grip Length: Where required for design purposes, the effective grip length (minimum distance from bearing surface of head to first full thread behind point) for Type AB and Ty
21、pe B P tapping screws may be determined by subtract- ing the point length constant shown i n Table 1, for respect- ive size and type, fromthe minimum screw length. Points: Type AB tapping screws shall have gimlet point. A slight rounding or truncation of point end is desirable. N o extrusion of exce
22、ss metal shall protrude beyond point apex. Types B, BF, and ET tapping screws shall have blunt point with tapered entering threads. Except for Type BF which a t manufacturers option may have ,complete crests, the crests of tapered threads shall be incomplete. Types BF and BT points shall have flutes
23、 as shown. Details of point design shall be optional providing flutes extend through f i r s t form thread (flutes on Type BF points with complete crests may be 1 pitch shorter) and screws meet the performance requirements set forth i n GM 6010-M specification. Type B P tapping screws shall have a c
24、onical point extendiw beyond tapered entering threads having incomplete crests. Body Diameter: Body diameter shall not be less than minimum minor diameter nor exceed maximum maJor diameter of thread. Materials: As designated by part number, tapping screws shall be made from carbon steel or corrosion
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- GMNA VOL SEC 2.701 1966
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