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Fasteners 8_17.qxp_Layout 1  8/18/17  11:55 AM  Page 6

                                                                    SELF-DRILLING SCREWS





                                                           TECHNICAL INFORMATION
             SELF-DRILLING SCREWS
        FASTENERS  Dual heat treated drill screws        Pull-out Tests – Steel (Lbs.)           Steel
                    ®
             Dril-Flex Structural Drill Screws
                                                          Screw
                                                                   Point      Drill
           provide the strength, ductility
                                                                                              1595  1693
                                                                                   501
                                                                                        634
                                                          10-16                3            .150          396
           and resistance to embrittlement                Size     Type       Cap.           18           16           14              12             1/8             3/16           1/4              5/16
           required for critical applications.            12-14    3    .187   396   527   710   1678  2061   2898
                                                          1/4-14   3    .187   398   530   686   1950  2264   3919
           Specifications:                                1/4-20   4    .312       516   649   1912  2296   2928   3561   4488
           • Diameters: #10 to 5/16"                      5/16-18   3   .210                  2333  2856
           • Lengths: 3/4" to 4"                          5/16-24   4   .312                  2148  2573   4226   5424   6622
           • Head/Drive Styles: Hex washer                3/8-16   1    .075            1843
             and phillips pan, wafer and undercut flat
           • Point Types: #3, #4 and #5                  Pull-out Tests – Aluminum(Lbs.)   Shear Tests – Aluminum(Lbs.)
           • Material: Alloy steel
                                                          Screw   Point      Drill     Aluminum 6063-T5  Screw  Point      Drill      Aluminum 6063-T5
           • Heat Treat: Grade 5
                                                          Size    Type       Cap.      1/8”           1/4”     3/8”   Size  Type       Cap.     1/8” -1/8”   1/8” -1/4”
           • Finish: Silver Stalgard® or Stalgard® SUB coating
                                                          10-16               3           .150  10-16              3            .150        1466
           Features & Benefits:                           12-14               3           .187       939       2286  12-14              3            .187        1797   2483
           • Stalgard® SUB coating (Hex washer product only) provides   1/4-14             3           .210      1003      2424  1/4-14            3             .210       1996   2883
             2000 hours of salt spray resistance (per ASTM B117)  1/4-20             4           .312       897       2075     3683  1/4-20            4             .312       2006   2926
           • High-hardness points and lead threads for drilling and   5/16-18          3            .210      1120     2967     4796  5/16-18         3             .210        2132   3009
                                                          5/16-24          4            .312      1043     2566  5/16-24         4             .312        1849   2926
             tapping with lower-hardness in load-bearing threads for
             ductility
           • Virtually immune to delayed embrittlement failures  Shear Tests – Steel (Lbs.)

                                                                                                  Steel
             Comparison to Stainless Steel Screws           Screw    Point      Drill       18-18     18-14    16.-16        14-14      1/8"-  3/16"-        1/4"-
                                                            Size     Type       Cap.                 3/16"           1/4"          12 ga.
            300 series stainless steel fasteners provide high resistance  10-16   3   .150   1362  1733  1462
            to hydrogen embrittlement failures. However, stainless  12-14   3   .187   1315  2118  1655   1816
            steel is galvanically incompatible with aluminum or  1/4-14   3   .210   1395  2313  1681   2417  2600
            steel panels. In this case, stainless steel fasteners trigger a  1/4-20   4   .312   1350 2086  1582   2450  2814   2810   2706
            sacrificial action, which can lead to degradation of the  5/16-18   3   .210   1509  2300  1811   3255
            panel and loosening of the fastener.            5/16-24   4   .312                       5486   5283   4761
                                                            3/8-16   1    .075                  6750
            A dual-hardening process allows Dril-Flex® fasteners to
            provide high strength and resistance to hydrogen  NOTE: All test setups and dimensions were as limited and outlined in AISI Test Method for Mechanically
                                                           Fastened Cold-Formed Steel Connections (CF92-1) document. Performance values listed are ultimate values
            embrittlement failures. Their Stalgard® finish provides
                                                           obtained under laboratory conditions.
            corrosion resistance several   Galvanic Series
                                        Anodic End
            times greater than other
                                Metal/Alloy    EMF(v)    Approvals
            commonly-used finishes.   Magnesium...............................-1.60
            If an environment is   Zinc.......................................... -1.10  • ICC-ES Report No. ESR-3332
                                Alum (5000, 6000, 7000)...........  -.75
            corrosive enough to                          • COLA (City of Los Angeles) Research Report #25095
                                Iron, Low Alloy Steels................   -.70
            significantly affect the   Alum (2000)............................... -.60  The information and data contained on this page is current as of publication date.
            Stalgard finish, the   Lead............................................-.55
                                18% Chromium Steel................. -.35
            potential for significant                    Identification
                                Naval Brass.................................-.30
            degradation of the   Brass, Bronze.............................. -.25  (hex washer head shown)
            aluminum/ stainless steel   Austenitic Stainless (300 Series) -.20  Elco® logo                                     raised circle
            assembly would also exist.  Nickel.........................................-.15
                                Silver........................................... 0
                                Gold..........................................+15
                                       Cathodic End
       6
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