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Fasteners 8_17.qxp_Layout 1  8/18/17  11:57 AM  Page 39

            HEX CAP SCREWS





              HEX CAP SCREWS
              Coarse & Fine Thread
              Grade 2, 5 & 8 Plated

              Hex head cap screws are manufactured    Shorter length screws are fully threaded.    Grade 5 (A449) Cap Screws are
              to dimensional standards of ASME        Product standards require the manufacturer’s   medium strength fasteners that
              B18.2.1 and to various material and     head marking to appear on the top of all hex   achieve their strength from a
              mechanical standards of ASTM            cap screws 1/4” diameter and larger.  quench and temper heat treat-
              and SAE.  The length of a cap                                                ment and have a greater tensile strength than a
              screw   is measured from under          Grade 2 (A307A)Cap Screws are        Grade 2. Yield-to-tensile ratio is the lowest of all
              the head to the extreme end of          made from low carbon steel that      heat treated steels.
              the screw. The standard thread          achieve their strength
              length is two times  the diameter       primarily from cold working          Grade 8 (A354 GR BD) Cap
              plus 1/4” up to 6” length and two       during the cold forming              Screws are the highest strength
              times the diameter plus 1/2” for        manufacturing operation. Economical for use in   of standard inch series cap
              screws longer than 6”.                  non critical applications where the fastener is not  screws and are made from alloy steel and have
                                                      subject to extreme temperatures or stress.  greater tensile strength than Grade 5. Designed
                                                                                           for use in high stress applications.




              TECHNICAL INFORMATION

              Product Specifications                   Dimensional Specifications

                                                                   E                                      F                                                G                                 H                                               L T
                                 F                     NOMINAL OR BASIC                     BODY                                           WIDTH  WIDTH    HEAD                                                       THREAD LENGTH
                                                       PRODUCT DIAMETER                   DIAMETER                                ACROSS FLATS                                       ACROSS CORNER      HEIGHT    SCREW LENGTHS
                                                                   MAX                     MIN              BASIC               MAX             MIN          MAX                MIN              BASIC             MAX            MIN       <6” REF              6”>REF
                                                       1/4             .2500              .2500        .2450         7/16        .438      .428       .505        .488       5/32        .163       .150          .750         1.000
                                                       5/16           .3125              .3125        .3065         1/2           .500      .489       .577        .557       13/64     .211       .195          .875         1.125
                                                       3/8             .3750              .3750        .3690         9/16        .562      .551       .650        .628       15/64     .243       .226         1.000        1.250
                       G                               7/16           .4375              .4750        .4305         5/8           .625      .612       .722        .698       9/32        .291       .272         1.125        1.375
                                                       1/2             .5000              .5000        .4930         3/4           .750      .736       .866        .840       5/16        .323       .302         1.250        1.375
                                                       9/16           .5625              .5625        .5545         13/16      .812      .798       .938        .910       23/64     .371       .348         1.375        1.625
                                                       5/8             .6250              .6250        .6170         15/16      .938      .922      1.083       1.051       25/64     .403       .378         1.500        1.750
                                                       3/4             .7500              .7500        .7410         1-1/8      1.125    1.100     1.299       1.254       15/32     .483       .455         1.750        2.000
                        Underside of Head              7/8             .8750              .8750        .8660         1-5/16   1.312    1.285     1.516       1.465       35/64     .563       .531         2.000        2.250
                                                       1                 1.0000            1.0000       .9900         1-1/2      1.500    1.469     1.732       1.675       39/64     .627       .591         2.250        2.500
                                                       1-1/8        1.1250            1.1250      1.1140        1-11/16 1.688    1.631     1.949       1.859       11/16     .718       .658         2.500        2.750
                                                       1-1/4        1.2500            1.2500      1.2390        1-7/8      1.875    1.812     2.165       2.066       25/32     .813       .789         2.750        3.000
                                                       1-1/2        1.5000            1.5000      1.4880        2-1/4      2.250    2.175     2.598       2.480       1-5/16    .974       .902         3.250        3.500
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