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Selection Guide

Ball Screw Nut Preload Explained

Explain how preload affects backlash, rigidity, heat, and price, avoiding the mistake that tighter is always better.

Published: · Selection Guide

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More preload is not always better

Preload reduces axial play between the screw and nut and improves rigidity and repeatability. But higher preload can increase friction, heat, and drive load, so it should follow the application instead of being set as tight as possible.

When low backlash or preload is useful

Machines with frequent reversing, repeatability requirements, higher rigidity, or low lost motion can consider low-backlash or preloaded nuts. Simple adjustment axes, packing machinery, and distributor stock often start by checking whether a standard nut is enough.

Preload affects quotation and lead time

Clear preload requirements may require confirmation of nut structure, inspection method, and assembly condition. For standard rolled screws, excessive preload may be uneconomical or require a higher accuracy solution.

  • State whether low backlash, preload, or standard nut is required.
  • Describe whether the machine reverses frequently.
  • Confirm load, speed, travel, and mounting direction.
  • If replacing, send nut photos and old-part backlash condition.

Next step

Turn this guide into an RFQ

When the specification direction is clear, send the details below together with quantity, lead time, and packing requirements.

Include these details

  • Model, diameter, lead, accuracy grade, or target application.
  • Load, speed, travel, mounting method, and matching rail or support-unit needs.
  • Quantity, lead time, packing, and whether inspection records or shipment photos are needed.
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