GUHRING - Каталог Метчики - 2011 EN

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              5NIVERSAL!PPLICATIONS
!LLOYED5NALLOYED3TEELS

           UNC /         ANSI length - ANSI shank
           UNF
                         Series 3990 - Cobalt, UNC, spiral point, TiN coated, STI style tap
                3B
Cut Taps   Class of Fit   Size         No.    Shank dia.  Square Size                        Overall               3B     Series  Order
                                                                                             Length
          STI Tap         4-40        Flutes     inch         inch                                               Approx.  3990     No.
                          6-32          3       0.141        0.110                            inch                         z      2.845
          Through Hole    8-32          3       0.194        0.152                           2.000                Limits   z      3.505
                          10-24         3       0.220        0.165                           2.380               H2/H3     z      4.166
                         1/4-20         3       0.255        0.191                           2.380               H3/H4     z      4.826
                         5/16-18        3       0.318        0.238                           2.500               H3/H4     z      6.350
                         3/8-16         3       0.381        0.286                           2.720               H3/H4     z      7.938
                         1/2-13         3       0.367        0.275                           2.937               H4/H5     z      9.525
                                        4       0.480        0.360                           3.381               H4/H5     z      12.700
                                                                                             3.810               H5/H6
                                                                                                                 H5/H6

             0° Helix    ANSI length - ANSI shank
             Plug Tap
          Chamfer Lead   Series 3991 - Cobalt, UNF, spiral point, TiN coated, STI style tap

            B · 3.5 - 5   Size         No.    Shank dia.  Square Size                        Overall               3B     Series  Order
                                                                                             Length
                          4-48        Flutes     inch         inch                                               Approx.  3991     No.
                          6-40          3       0.141        0.110                            inch                         z      2.845
                          8-36          3       0.168        0.131                           2.000                Limits   z      3.505
                          10-32         3       0.220        0.165                           2.126               H2/H3     z      4.166
                         1/4-28         3       0.255        0.191                           2.374               H3/H4     z      4.826
                         5/16-24        3       0.272        0.238                           2.500               H3/H4     z      6.350
                         3/8-24         3       0.381        0.286                           2.720               H3/H4     z      7.938
                         1/2-20         3       0.323        0.242                           2.940               H3/H4     z      9.525
                                        4       0.429        0.322                           3.157               H3/H4     z      12.700
                                                                                             3.594               H5/H6
                                                                                                                 H5/H6

                                                          major dia.                         wire thread insert
                                                          minor dia.

                                                                         basic thread for
                                                                         thread insert STI

                                              TECH TIP: Heli-Coil STI Taps

                                              An STI Tap thread tap is designed to create an oversized
                                              hole so it can accommodate the required Heli-Coil insert.

                                              Screw Thread Inserts are helically formed coils of diamond-
                                              shaped stainless steel or phosphorous bronze wire that
                                              screw into a threaded hole to form a mating internal thread.
                                              Screw thread inserts are a convenient way of repairing
                                              stripped out threads and are also used to provide stronger
                                              threads in soft materials than what can be obtained by
                                              directly tapping the base material. Aluminum, zinc die cast,
                                              magnesium and even wood are some materials an STI may
                                              be used in.

          60  Bright     Steam Oxide  TiN     TiCN                     MolyGlide                      TiAlN               AlCrN   FIREX®

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