Maintenance-Free Lead Screw Assemblies

The key difference between trapezoidal, ACME, dryspin® high helix, and metric lead screws lies in their thread geometry and application.

Trapezoidal and ACME (imperial) lead screws are very similar with a slight 1-degree difference in the thread angle. They are mostly 1 continuous thread (1-start) but a few are available with 2-starts. They are non-back-driveable so they are ideal for vertical applications without the need for a brake or locking mechanism. Because they have smaller leads they are better for fine adjustments. 

igus® dryspin® is an optimized thread geometry for high helix and is now available in a few trapezoidal dimensions. The high helix screws contain multiple threads (starts) and allow for longer linear travels with fewer rotations of the screw. They are not self-locking and may require an ancillary brake or clamp. Due to their improved geometry over other high helix threads on the market they exhibit better wear resistance, efficiency and lower noise emission.
 
Metric screws are more commonly known and used as fasteners. However, for smaller applications that require more precision they can be a perfect fit. igus® offers these in dimensions from 3mm-10mm, so they are ideal for constrained spaces with low loads.

Anti- and zero-backlash lead screw systems work by reducing clearance between the nut and screw to eliminate play. igus® achieves this through preloading components with springs or o-rings, providing precise positioning while compensating for thermal expansion and ensuring smoother motion. These systems are ideal for applications requiring high accuracy and minimal backlash.

Lead screws can be back-driveable depending on the nut's efficiency and coefficient of friction (COF). Trapezoidal, ACME, and metric single-start screws do not typically back-drive, where high helix profiles are designed to be back-driveable.

Lead screws can be used underwater depending on the materials used for the screw and nut. igus® offers 300-series stainless steel and anodized aluminum lead screws that are well-suited for submerged environments. They also provide a variety of nut materials designed for different applications, including those exposed to splash water or continuous immersion, ensuring optimal performance and durability in aquatic conditions.

The longest recommended lead screws typically range from 500mm to 3000mm in length. The ideal length depends on factors like screw diameter, application speed, load, and orientation. For longer lengths, resonance may occur at higher speeds. If you have any questions, contact our Lead Screw Expert.

Lead screw noise can occur when the diameter, speed, and stroke length exceed the recommended limits for the screw. This can cause vibrations or improper engagement between the threads, resulting in noise. Other factors such as insufficient lubrication, misalignment, or the choice of material for the nut and screw can also contribute to sound generation. To reduce noise, consider optimizing the lead screw dimensions, ensuring proper alignment, and using materials designed to minimize friction and wear.

The lead screws are available in 304SS for corrosion resistance, carbon steel for lower cost, and aluminum for non-magnetic requirements.

Lead screw nuts are available in  igus® plastics such as iglide® J which is our most widely used nut material; J4 for our lowest cost material; J350 for high temperature applications, especially ones that reach 350F; A180 for FDA compliance; iglide® R for vibration dampening properties; W300 for high static loads and simple adjustments; iglide® X for applications reaching 500F or when exposed to caustic chemicals; and E7 for light loads being moved at extremely high speeds.

The lifespan of a lead screw depends on factors such as load, speed, material, and operating conditions. igus® offers an online product finder where the service life, required drive torque, and warning for noise/resonance are provided. You can also purchase the product immediately online as well as save the configuration. Proper maintenance and alignment also play a significant role in extending the lead screw's longevity.

Yes, igus® has this online configurator where you can customize your lead screw. You also receive a 2D and 3D drawing, a part number, and can easily save your configuration and order online.

Our most common nut geometries are our sleeve (cylindrical) and flange designs. We do also have specialty designs for low clearance and heavy duty applications, as well as ACME (imperial) nuts.

Yes, igus® offers lead-screw motor designs along with a lifetime calculation tool as assorted mounting block options, shaft collars and other accessories