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Fasteners 8_17.qxp_Layout 1  8/18/17  11:57 AM  Page 31

            SELF-TAPPING SCREWS





              STRUCTURAL SCREWS                               PERFORMANCE DATA

              Tap-Flex Thread-Forming Screws                Seating Torque (in lbs)
                     ™
              Increased thread engagement with strength and ductility.  Fastener  6063 T5 Aluminum  6061 T6 Aluminum      6063 T5 on 1018 Steel      6061 T6 on 1018 Steel
              Feature a unique thread profile to ease installation and   Size  1/8       3/16     1/4       1/8      3/16    1/4        1/8     3/16      1/4      3/8       1/8     3/16    1/4       3/8
                                                            3/8-16          171         214          285        231         328        490         412         638         805       858          389       581         740        771
              increase performance
                                                            1/2-13   255   368   471   338   547   767   558   955       1375    1895   513  807      1189      1658
              Specifications:                               5/8-11   261   486   662   343   694   943   654      1258       1662     2976   600     1061     1492      2083
              • Diameters: 3/8", 1/2", & 5/8"               Note: These numbers were calculated from the maximum reading (failure torque) during drive-to-fail testing
                                                            (Seating Torque = Failure Torque x .75).
              • Head Style: Hex washer
              • Threads: E-Form® five-lobe                   Shear (Ultimate lbs)
               thread forming
              • Material: Alloy steel                       Fastener 6063 T5 Aluminum  6061 T6 Aluminum      6063 T5 on 1018 Steel      6061 T6 on 1018 Steel
              • Finish: Silver Stalgard®                    Size  1/8 to 3/16 to 1/4 to 1/8 to 3/16 to 1/4 to 1/8 to    3/16 to 1/4 to 3/8 to 1/8 to 3/16 to 1/4 to 3/8 to
               SUB coating                                         1/8      3/16     1/4       1/8      3/16    1/4        1/8     3/16      1/4      3/8       1/8     3/16    1/4       3/8
                                                            3/8-16   2321  3476   4979  3560  5205  6885  5015  6560  6975  6965   5711  8701  7721  7611
              • Heat Treat: Grade 5; meets ASTM A449 specifications
                                                            1/2-13   2784  3669   5230  4482  6167  8718  4773  6455  8396  8689   6052  9769    13976   13340
               (120 KSI strength)                           5/8-11   2696  3775   5455  4216  6768  9292  4558  6196  8290  8060   5967  9577    13124    15309
              Features & Benefits:
              • E-Form thread overcomes friction build‑up and reduces
               drive torque
              • Roll forms own work-hardened thread to resist loosening   Pull Out (Ultimate lbs)
               and provide enhanced pull-out values
                                                            Fastener 6063 T5 Aluminum  6061 T6 Aluminum                 1018 Steel
              • Virtually immune to delayed embrittlement failures
                                                            Size   1/8      3/16     1/4       1/8      3/16      1/4       1/8     3/16     1/4      3/8
              • Stalgard SUB coating provides 2000 hours of salt spray
                                                            3/8-16   1311  2365   3281  2080  3805  5981  3501  5986    11440    11862
               resistance (per ASTM B117)                   1/2-13   1431  2230   3694  2190  3869  7527  3668  7411    13613    20440
                                                            5/8-11   1755  2907   4191  2641  5202  8210  4500  8300    16678    26680
              Enhanced Thread Design:
              Tap-Flex screws are threadformers with the patent-
              pending E-form® segmented thread profile.
              This design improves both installation and
                                                                   ™
                                                            Tap-Flex Thread-Forming Structural Screws
              in‑place performance:
                                                             ITEM                                     SIZE                                                    HEAD/DRIVE                   LOAD BEARING          DRILL BIT                BOX                     CTN                  FINISH
              • Decreases thread-forming torque,   E-Form® Profile  CODE                   LENGTH                        SIZE                           QTY.                     QTY.
               easing starting and placement               3/8" Diameter Anchors with 9/16" Hex Washer Head
                                                            ELC ESU310  3/8"-16 x 1-1/2"  9/16" HWH  1.00”   11/32”   -  500  Stalgard SUB
              • Overcomes friction build-up and
                                                            ELC ESU310/C  3/8"-16 x 1-1/2"  9/16" HWH  1.00”   11/32”   100  -  Stalgard SUB
               reduces drive torque                         ELC ESU320  3/8"-16 x 2"  9/16" HWH  1.49”  11/32”   -  500  Stalgard SUB
              • Increases thread engagement, so it          ELC ESU320/C  3/8"-16 x 2"  9/16" HWH  1.49”  11/32”   100  -  Stalgard SUB
                                                            ELC ESU330  3/8"-16 x 2 1/2"  9/16" HWH  1.99”  11/32”   -  500  Stalgard SUB
               resists back-out and loosening caused        ELC ESU330/C  3/8"-16 x 2 1/2"  9/16" HWH  1.99”  11/32”   100  -  Stalgard SUB
               by vibration or thermal changes             1/2" Diameter Anchors with 3/4" Hex Washer Head
                                                            ELC ESU410  1/2"-13 x 1-1/2"  3/4" HWH  0.875”  15/32”  -  250  Stalgard SUB
                                            material rolls in to
                                                            ELC ESU410/C  1/2"-13 x 1-1/2"  3/4" HWH  0.875”  15/32”  50  -  Stalgard SUB
                                            fill space, increasing
                                                            ELC ESU420  1/2"-13 x 2"  3/4" HWH  1.365”  15/32”  -  250  Stalgard SUB
                                            thread engagement  ELC ESU420/C  1/2"-13 x 2"  3/4" HWH  1.365”  15/32”  50  -  Stalgard SUB
              Identification                                ELC ESU430  1/2"-13 x 2-1/2"  3/4" HWH  1.865”  15/32”  -  250  Stalgard SUB
                                                            ELC ESU430/C  1/2"-13 x 2-1/2"  3/4" HWH  1.865”  15/32”  50  -  Stalgard SUB
                                                           5/8" Diameter Anchors with 3/4" Hex Washer Head
                           Elco® logo
                                                            ELC ESU510  5/8"-11 x 1-1/2"  3/4" HWH  0.800”  19/32”  -  250  Stalgard SUB
                                                            ELC ESU510/C  5/8"-11 x 1-1/2"  3/4" HWH  0.800”  19/32”  25  -  Stalgard SUB
                                                            ELC ESU520  5/8"-11 x 2"  3/4" HWH  1.24”  19/32”  -  150  Stalgard SUB
                                            raised circle                   ELC ESU520/C  5/8"-11 x 2"  3/4" HWH  1.24”  19/32”  25  -  Stalgard SUB
                                                            ELC ESU530  5/8"-11 x 2-1/2"  3/4" HWH  1.74”  19/32”  -  150  Stalgard SUB
                                                            ELC ESU530/C  5/8"-11 x 2-1/2"  3/4" HWH  1.74”  19/32”  25  -  Stalgard SUB
                                                            The information and data contained on this page is current as of publication date.
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