Nuts

Trapezoidal Lead Screws

Buttress & Hybrid Lead Screws

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Custom and Standard Acme Lead Screws, Lead Screw Nuts

Precision Screw Thread designs Acme lead screws (power screws) for industries including aerospace, bio-medical devices, robotics and system automation. The Acme thread makes a very robust actuation screw that packs a great deal of dynamic and static capacity into a power transmission package. PST has achieved nearly 60% efficiency with some of our custom Acme thread screw and nut packages. Wondering if the Acme lead screw is the right lead screw for your application? Send your specifications to PST and we help you find the best combination for your system.

Acme Lead Screw Capabilities

Screw Diameter: 3/16 in. - 8 in.
Lead Angle: up to 43 degrees
Threads Per Inch (TPI): 2 threads - 120 threads
Screw Length: long as steel available
Lead Accuracy: down to .0005/12 inches
Screw Efficiency: up to 60% (power screw)
Screw Straightness: .002/12 inches
Materials: See table below.

Power Screw and Nut Set
designed for the world’s first truly bionic prosthetic foot invented by Össur.
PST was able to achieved nearly 60% efficiency within this nut and screw package. Read more about this power screw on our blog.

BHN
40-120 RC
20 RC
25 RC
30 RC
35 RC
40 RC
45 RC
50

Aluminum
Brass/Copper
Plastic
Carbon Steel
Alloy Steel
Aircraft Alloy
Stainless 300 + 400
Exotic Aerospace

In the United States Acme threads are probably the most commonly used thread profile when designing a lead screw for power transmission or linear motion (the European equivalent is the Trapezoidal thread profile). The Acme thread makes a very robust actuation screw that packs a great deal of dynamic and static capacity into a power transmission package. This exceptional capability does come at a price in its efficiency with Acme thread screws being approximately 30-40% efficient.

PST does offer Acme threaded lead screw and nut assemblies that are manufactured using proprietary processes wherein the efficiencies are typically improved by 10-15 percentage points or more. Please contact PST with your specific requirements.

Stub Acme Lead Screws

The Stub Acme thread profile is a variant of the Acme thread profile and is used in situations where a coarse pitch, shallow thread is needed for power transmission or linear motion but there are mechanical or metallurgical design limitations. The American Society of Mechanical Engineers standard which PST uses for design and manufacture of Stub Acme thread is ASME/ANSI B1.8-1988. The standard covers:

Sub Acme Threads
Modified Stub Acme Threads, Form 1
Modified Stub Acme Threads, Form 2
Gaging for Stub Acme Threads

Just like Acme threads, Stub Acme threads make a very robust power transmission thread but can have the same efficiency issues. Likewise, just like the Standard Acme lead screws, PST can supply an improved efficiency Stub Acme screw and nut assembly for power transmission and linear motion.