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taper tap

   Also found in: Dictionary/thesaurus 0.01 sec.
taper tap [′tā·pər ‚tap]
(design engineering)
A threaded cone-shaped tool for cutting internal screw threads.


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The taper tap has some chamfer threads shaping a tapered cone on the inserting end.
Chamfer lengths * bottoming tap chamfer length = 1 to 2 times pitch length * plug tap chamfer length = 3 to 5 times pitch length * taper tap chamfer length = 7 to 10 times pitch length Using a 1/4-20 UNC tap as an example, the pitch length of this thread is 1/20=0.
Rules for tap chamfers: * taper tap chamfer = thread pitch x 9 * plug tap chamfer = thread pitch x 4 * bottoming tap chamfer = thread pitch x 1.
 
 
 
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