Similar to acme threads, trapezoidal threads have a 30-degree flank angle, compared to the acme form’s 29-degree flank angle.

The difference between acme threads and trapezoidal threads comes down to one degree. An acme thread has a 29-degree flank angle adopted in the United States while a trapezoidal thread has a 30-degree flank angle that was adopted in Europe.

REMPCO can produce trapezoidal thread according to industry standards, typically at a fraction of specified tolerances.

Modified square threads have a trapezoidal form with a five-degree flank angle. Since the angle is small, transmission efficiency is practically equivalent to a true square thread. They have a higher load capacity than standard square threads and are typically less costly to manufacture. For all your thread products needs, reach out to REMPCO. We specialize in replacement spare parts, …

Their thickness and width also help them perform better in environments with dirt and debris. Acme threads are used much more commonly in the United States while the closely related trapezoidal thread form (30-degree angle) is preferred in Europe. Be sure to visit our blog where we dive into the differences between acme and trapezoidal threads.

Elevate your projects with our comprehensive range of versatile thread forms, with the ability to roll hardened and stainless steels.

Class Fit – A blank size would differ on a unified thread depending if the thread requires a 1A, 2A or 3A fit. The same logic would apply for different class fits for metric, acme, and trapezoidal threads.

We produce fully threaded bars and rods with superior strength, finish, dimensional integrity, and accurate lead tolerances.

Thread rolling extends distinct benefits to both their producers and users: high rates of production, low costs, and reduced waste.

ISO 9001:2015 Certified Copyright © 2025 Rolled Threads Unlimited, LLC | All Rights Reserved | Privacy Policy