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

                                                                    SELF-DRILLING SCREWS




                                                                                                                          ™
             BI-METAL SELF-DRILLING SCREWS                 PERFORMANCE DATA
        FASTENERS  Bi-metal technology                    Pull-Out Values (Lbs) †              Pull-Out (Lbs.)
             Bi-Flex 300 Series Stainless Steel
                  ™

            provides outstanding
            corrosion resistance and                      T5          Drill               Steel RB60-75        Aluminum6063-
            long service life. Bi-Flex ™                  Screw       Capacity            50-66KSI             22KSI
            fasteners provide the                         8-18             #2          0.100  499  558  875       1425
            corrosion resistance of 300                   10-16          #2   0.110   595  633  943   1433  −   −   −   994   −
            series stainless steel and                    10-16          #3   0.187   −   616  684   1242  1605 1527      −   961   −
                                                          12-14   #2   0.110   528  750  892   1536  −   –   −   1132  −
            the efficiency of drill screws.
                                                          12-14   #3   0.230   417  679  802   1371   2028  2499  −   974  −
            Specifications:
                                                          12-24   #5   0.500   −   −   −   −     −    2110  2781  538   1995
            • Diameters: #10 to 1/4"
                                                          1/4-14   #2   0.110   619  885  1082  1830   2943  –   −   1310  −
            • Lengths: 3/4" to 8"
                                                          1/4-20   #3   0.230   −   680  780   1442   2623  3684  4069  1037  –
            • Drive Systems: Hex and phillips             1/4-20   #5  0.500   −   −   −   −     −    −    2622  −    1724
            • Material: Hardened steel tapping threads and point fused
             onto an 18-8 stainless steel shank and head
                        ®
            • Finish: Stalgard GB (Galvanic Barrier) coating  Ultimate Strengths**
            Features & Benefits:
            • High strength, ductility and reliability   Size                     Tensile                        Shear
                                                                   (Lbs)           Average Lbs Ultimate
            • Virtually immune to delayed embrittlement failures
            • Greater galvanic compatibility in dissimilar metal   10-16   1847   1282
                                                          12-14    2628       1950
             applications involving aluminum
                                                          12-24    2734       2284
            • High in-place value over the life of application
                                                          1/4-14   3459       2676
                                                          1/4-20   4124       2860
                                                         ** Values are for 300 series stainless fastener threaded shank
             Susceptibility To Embrittlement Failures               1
                                                                    2
                                                            400 Series
            In head to head testing, Bi-Flex 300 fasteners          3          Failure
                                  ™
                                                           SS Modified  4      Failure
            and three different types of 400 series martensitic
                                                                    5          Failure
            stainless, self-drilling screws were installed in identical
            test coupons of unplated steel and aluminum. They  410 SS  1                        Failure
                                                                    2                       Failure
            were then subjected to a mildly corrosive environment  Case Hardened
                                                                    3                       Failure
            of 5% neutral salt spray testing per ASTM B117. At  with Aluminum  4                             Failure
                                                             Top Coat  5
            the start of the test all samples were torqued (preloaded)                      Failure
            to 75 in lbs. Every 24 hours the samples were inspected for
                                                                    1                           Failure
            torque value and retorqued to 75 in lbs. The parts were  410 SS Super  2  Failure
            evaluated by scanning electron microscope (S.E.M.) to   Passivated  3  Failure
            determine the type of fracture that had occurred. The  Plain Finish  4 5        Failure      Failure
            three 400 series fasteners showed an intergranular type
            failure, indicative of fracturing that occurs from hydrogen  1
                                                                    2
                                                              ™
            assisted stress corrosion cracking. No failures or loss of  BI-FLEX 300  3  NO FAIURES/NO LOSS OF PRELOAD
            preload                                         Fasteners  4
                                                                    5
            All fasteners were placed through a clear hole in 6061 T6 aluminum with a  hours  0  24  48  72  96  120  144  168  192  216  240
            thickness of 0.125" and drilled into an unplated steel strip measuring a
            thickness of 0.125". A strip of 0.060" aluminum was placed in between the  Failure = Catastrophic Failure
            0.125" aluminum and steel strip on one side, to simulate a fastener placed
            under load.                                             The information and data contained on this page is current as of publication date.
       8
           800 456-2658         email: sales@tannerbolt.com        www.shoptanner.com
                                   714 Montauk Ave., Brooklyn,  NY 11208    718 434-4500   Fax: 718 434-3215
                                    60-01 55th Drive, Maspeth, NY 11378    718 786-2050   Fax: 718 228-7297
                                                     800 3rd Ave., Brooklyn, NY 11232  929 337-1821
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