ACME threaded rod and trapezoidal lead screws are two types of lead screws that are commonly used automation industry.Both of them use trapezoidal thread form,but have different thread angles.

ACME Threaded Rod

Acme screws are made in inch sizes with thread angle of 29°.Acme rod sizes are specified by lead screw diameter and TPI.ACME threads were developed for imperial units and are common in US.

Trapezoidal Lead Screw

Trapezoidal screws produced in metric sizes,they are the standard in European countries.ACME threads and trapezoidal threads are similar in design,they are interchangeable in some cases.

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