They are supplied with the same size shanks as all other taps of the same sizes, taps 3/8 or smaller must be ordered special to have shanks smaller than the tap major diameter. Manufactured to Table 302/303 standards and 337 Thread Specifications. Proper number of flutes to provide sufficient chip room and cutting edges to handle most threading jobs. Precision ground for a wide variety of applications. The shanks on all standard extension taps follow the same rules per USCTI table 302. General-purpose tap used either by hand or on production machines. The truth of the matter is that all pulley taps intentionally have shanks that are bigger than the thread major diameter on the tap thread, because they were originally designed to thread screw holes in pulleys, and the larger shanks were used to guide the tap thru the pulley and into the center of the pulley to be threaded.Įxtension taps (4 and 6 inch long) also are nothing but hand, or spiral pointed taps with a longer shank than normal. In the regal Cutting tools’ catalog, you will find over 9,500 products, ranging from taps, drills, end mills, dies, gages and the high performance triple Crown series of taps and end mills. With: Glennis McClure, Extension Farm and Ranch Management Specialist, UNL and Jim Jansen, Extension Agricultural Economist, UNL. Hand taps spiral point, spiral flute, and form taps are all commonly made to USCTI Table 302, or 302A in the United States.Īll of these taps have shanks that are larger than the major diameter of the thread itself up to and including 3/8.Īnything over 3/8 will have a shank diameter that is smaller than the thread major diameter, and therefore can be used for producing threads that are longer than the standard tap thread length. They provide good precision and accuracy in threading tasks. High-performance taps are harder and more wear-resistant than high-speed steel taps. The TiCN coating on these taps protects them from wear and is harder and more wear-resistant than a TiN coating. WIDIA thread mills produce threads for blind and through holes with precision. TiCN-Coated High-Performance Thread-Forming Extension Taps. View Categories Spiral Fluted Taps Pipe Taps GP+ GUN® Taps Hand Taps GUN® Taps Thread Forming Taps High Performance Thread Mills. They are indeed great for producing threads where reach is required to get to where the tap begins to thread, but will not normally produce longer lengths of thread. Choose from pipe taps, hand taps, thread forming, GUN® taps, and more. Maintaining Industry-Standard shank and square dimensions allows the use of standard tool holders.We are frequently asked by end-users to provide a pulley tap to produce a longer thread length than what is on the tap, but in all cases the standard pulley tap has a shank diameter that is greater than the tap major diameter, and therefore cannot be used to produce longer thread lengths without altering the shank diameter. Most manufacturers have standardized on 6, 8, 10, and 12 inches in blank length (varies by diameter) for stock tools. When in doubt, specify “small-shank” when tap use is intended to exceed standard thread length.Īs with any tool, these extended-reach taps can be made to custom lengths. If additional reach is needed, with the desire to tap beyond the thread length of the blank, the terminology changes to Extension/Small Shank.Ībove 3/8” in diameter, the standard Extension blank has a smaller shank diameter, and is defined only as “Extension”. Pulley and Extension taps use the same Industry-Standard blank. Restore bolt, hole, pipe, and conduit threading with this set of four files. Use them for quick threading action with compatible fasteners. The shank diameter “clears” the drilled hole.Īll this seems pretty straightforward, but somewhere the industry decided to add a twist. The coil-style threads produced by these taps are shallower and more widely spaced than standard thread sizes. However, the shank diameter is reduced to allow tapping beyond the ground thread length of the tap. “Extension” taps provide additional length for reach just as pulley taps do. Today, the term is rarely recognized by recent generations. Thread depth could not exceed the thread length of the tap. The shank was used as an alignment guide to reach through the pulley hub. Length was extended, but shank diameter was approximately the same as the thread major diameter. “Pulley” taps were originally designed to tap threads in a pulley assembly.
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