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SFM Safety Nut

Product catalog summary

Overview
The document discusses the SFM Safety Nut, a backup safety feature designed for vertical ball screw applications. It emphasizes the importance of having a safety lock mechanism in ball nut assemblies to prevent load failure in case of a ball nut malfunction.

Design and Functionality
The SFM safety nuts are available in various sizes to meet different application requirements. They are mounted below the traveling nut without any axial load. In the event of increased axial play due to wear or damage, the safety nut engages with the screw thread to hold the load and prevent machine damage.

Installation
The document provides a link to a video tutorial for installing an external safety nut onto a ball screw, highlighting the ease of installation.

Applications
SFM safety nuts are particularly suitable for applications requiring high safety standards, such as patient tables, stage constructions, and airport people bridges.

Specifications
The document lists various sizes of SFM safety nuts, detailing dimensions and maximum load capacities. It notes that the safety nut can only be installed with the corresponding flanged nut and guarantees normal function up to an axial play of 0.4 mm.

Additional Information
Thomson offers complete units with integrated safety nuts and provides contact information for further inquiries. The document also includes a disclaimer about the responsibility of the product user to determine the product's suitability for specific applications.

Catalog excerpts

Backup Safety Feature For Vertical Ball Screw Applications www.thomsonlinear.com A REGAL REXNORD BRAND

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Maximizing Safety In Vertical Ball Screw Applications When installing a ball nut assembly in a vertical application, it can be critical to have a safety lock mechanism in the ball nut assembly to hold the load in the event of a ball nut failure. Thomson SFM safety nuts deliver reliable backup functionality for the traveling nut to ensure maximum safety. Flexible Design Options To best accommodate your application requirements, SFM safety nuts are available in various sizes. The safety nut is an optional part to a ball screw assembly and mounted below the traveling nut without any axial load applied....

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The normal function of the unit is guaranteed up to an axial play of 0.4 mm. Note: The safety nut can only be installed together with the corresponding flanged nut. Thomson also offers complete units with integrated safety nuts (flanged and cylindrical). Contact Thomson Customer Service for more information or for additional technical resources: www.thomsonlinear.com/cs.

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Contact us or any of our 2000+ global distribution partners by scanning the code below or visiting www.thomsonlinear.com/contact www.regalrexnord.com www.thomsonlinear.com SFM_Safety_Nut_BRUK-0048-02 | 20260430SK | MCB-12795-TL-EN-A4 04/26 Specifications are subject to change without notice. It is the responsibility of the product user to determine the suitability of this product for a specific application. All trademarks property of their respective owners. ©2026 Thomson Industries, Inc. | 2400 Curtiss Street, Downers Grove, IL 60515 USA

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SFM Safety Nut

SFM Safety Nut

Catalog excerpts

All Thomson Industries, Inc. catalogs and technical brochures