Flanged Single Nut for Ball Screw Assemblies in Machine Tools

Bosch Rexroth has expanded its linear motion technology portfolio with the newly developed FEH-E-B flanged single nut. The component complements the existing Performance Line and is specifically tailored for vertical and highly dynamic linear applications. It is primarily aimed at the machine tool industry and designers of servo presses who require powerful and precise screw drive technology for continuous operation.

Mechanical Optimization and Performance Enhancement
The new development features an optimized run-off behavior achieved by a split ball chain with a reduced number of ball circuits. This design modification ensures a smoother run and increases the dynamic load capacities by up to 14 percent compared to the previous model. Consequently, the calculated service life of the ball screw assembly is extended by up to 50 percent. This performance enhancement improves process quality and reliability in automation scenarios where high masses must be moved in a highly dynamic manner.

Technical Specifications and System Integration
The form B flanged single nut is available in eight sizes, covering nominal diameters from 32 to 63 millimeters and leads from 5 to 20 millimeters. The connection dimensions are based on the DIN 69 051, Part 5 standard to facilitate integration into existing machine concepts. The system is available in various preload and tolerance classes up to class T3 and integrates a comprehensive sealing concept, including front lubrication units. In addition to the new FEH-E-B, the Performance Line includes the FAR series for driven nuts and the double-start FED series, which can be combined with around 50 available screw sizes. The digital dimensioning and ordering of the standard assemblies are carried out via the company's own Linear Motion Technology Selector and Configurator, which also provides design data.

Additional Context
This section details technical specifications and competitive benchmarking not included in the original product announcement

The market for high-precision ball screw assemblies is characterized by global manufacturers such as THK, NSK, and Schaeffler, who focus heavily on the CNC technology segment, where rigidity and positioning accuracy in the micrometer range are essential. The integration of a split ball chain in the FEH-E-B nut aims to reduce internal friction and the resulting heat generation. This is a crucial factor in minimizing thermal expansion of the screw at high rotational speeds in machining centers. Compliance with the connection dimensions according to DIN 69 051 (which is closely linked to ISO 3408 today) also ensures the mechanical interchangeability of the assemblies in the European market. In direct comparison to cost-intensive direct linear drives (linear motors), this electromechanical advancement in screw technology delivers a highly competitive ratio of axial force density, energy efficiency, and total cost of ownership for classical mechanical engineering.

Edited by Maria Brueva, Induportals editor – adapted by AI.

www.boschrexroth.com