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The Acme thread was developed to avoid the problems with the square thread form. In a square thread the cross section reveals a zero degree pitch, and is difficult to thread. To offer better characteristics, the Acme thread was developed.
The Acme thread form form uses a 29 degree pitch with flat apex and valley. The Acme screw 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 vises or the lead screw of a lathe.
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"Acme thread form"