Forming taps12/1/2023 No Lead Screw Necessary: These taps work equally well when used in a standard tapping head, automatic screw machine, or lead screw tapper. On most applications, therefore, conventional equipment is suitable for driving cold forming taps. Torque: Where the operation calls for 75% of thread or less, the torque required varies with the material from no additional torque to 50% additional torque. These tools, with four threads of taper, will require less torque, will produce less burr upon entering the hole, and will give greater life. Copper and copper alloys (ductile brasses)Ĭold Forming Tap Application Information Tapping Application The Same: Except for changes in hole size, the application of cold forming taps differs in no way from conventional cutting taps.īlind Hole Tapping Possible: Whenever possible, in blind holes, drill or core deep enough to permit the use of the plug style taps.Aluminum die casting alloys (low silicon).Examples of material classes which have been tapped are: Surface damage may cause torque to increase to a point of stopping the machine or breaking the tap.Ĭold forming taps have been recommended for threading ductile materials. This may be accomplished by using sharp drills, correct speed and feeds. Material Recommended: Care must be taken to minimize surface damage to the hole when tapping materials which are prone to work harden. The resulting thread has a burnished surface. The cold forming tap has neither flutes nor cutting edges and therefore, it produces no chips and cannot create a chip problem. These grain fibers are not cut away as in conventional tapping. The desired thread is formed in the metal under pressure and the grain fibers, as in good forging, follow the contour of the thread. Internal threads can be produced by a cold forming or swaging process.
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