Trapezoidal thread form
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ACME Thread
ACME uses a 29 degree pitch with flat apex and valley. The ACME thread is stronger than V-profile 60 degree threads. Wear can be compensated for with a "split nut". Typically found where large loads or accuracy is required as in the lead screw of lathes.
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--Scottkm 18:19, 21 December 2005 (UTC)