Ball Screws with end-cap circulation – fast & quiet
For applications where high speeds and low noise are essential, Ball Screws with end-cap circulation are the ideal solution. They achieve DN values of up to 180,000 and, thanks to their compact and lightweight design, are perfectly suited for dynamic positioning tasks in CNC machines, electronics manufacturing, and medical technology.
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Lightweight – 18–30% smaller than standard designs
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DN value up to 180,000
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Quiet operation – minimal noise
How does end-cap circulation work?
In end-cap circulation, a return cap is integrated at each end of the nut. After passing through the load-bearing thread turns, the balls leave the raceway and enter the end cap on one side. From there, they are guided through a longitudinal channel integrated into the nut body to the end cap on the opposite side, where they re-enter the next load-bearing groove.
This type of circulation ensures especially smooth ball return. The balls are redirected gently, which minimizes noise even at very high speeds.
Your benefits at a glance
Easy maintenance
The end caps are externally accessible as separate components. The return units can be replaced when necessary without fully disassembling the nut.
Multi-start threads
Thanks to the design with end caps on both sides, this circulation type is particularly well suited for multi-start threads. It's ideal for applications requiring high feed rates per revolution.
Compact design
Thanks to the flange-less DEEG design type and the reduced outer diameter, end-cap circulation can be easily integrated into tight installation spaces.
Typical applications
High feed rates are required in wood processing. The end-cap design is well suited for positioning applications with high speed requirements, as typically found in woodworking.
In PCB assembly systems every millisecond counts. End-cap circulation enables extremely fast positioning movements thanks to its compact design and high dynamics, while maintaining a low noise level.
In automated conveyor systems or linear modules that need to cover long distances quickly, Ball Screws with end-cap circulation are the preferred choice.
While the clamping unit often requires heavy-duty ball screws, end-cap drive systems are used in less force-intensive but highly dynamic axes. This design is well suited for certain functions in plastic injection molding applications.
Machining centers require high rapid traverse speeds to reduce non-productive time. End-cap circulation enables extremely high rotational speeds (DN values up to 180,000) thanks to its optimized ball return system, while maintaining low noise levels.
Type overview
FEEG – Single flange nut with end-cap circulation
The FEEG series is the compact standard solution for flange-mounted applications. It offers an excellent combination of high dynamics, low weight, and low noise levels.
Nominal-Ø (mm)
Lead (mm)
Dynamic load rating (kN)
Static load rating (kN)
Rigidity K (N/µm)
Nominal-Ø (mm)
Lead (mm)
Dynamic load rating (kN)
Static load rating (kN)
Rigidity K (N/µm)
FDEG – Double flange nut with end-cap circulation
The FDEG series features two nuts preloaded against each other, completely eliminating axial play. This makes it ideal for highly dynamic positioning axes with changing load directions.
Nominal-Ø (mm)
Lead (mm)
Dynamic load rating (kN)
Static load rating (kN)
Rigidity K (N/µm)
Nominal-Ø (mm)
Lead (mm)
Dynamic load rating (kN)
Static load rating (kN)
Rigidity K (N/µm)
DEEG – Cylindrical single nut with end-cap circulation
The DEEG series is designed without a flange and as a cylindrical single nut. It's integrated into a customer-specific housing and secured using retaining rings. This design saves axial installation space and offers maximum flexibility.
Nominal-Ø (mm)
Lead (mm)
Dynamic load rating (kN)
Static load rating (kN)
Rigidity K (N/µm)
Nominal-Ø (mm)
Lead (mm)
Dynamic load rating (kN)
Static load rating (kN)
Rigidity K (N/µm)
DDEG – Cylindrical double nut with end-cap circulation
The DDIG series combines the advantages of the cylindrical design with the preload of a double nut. It consists of two cylindrical nuts that are preloaded against each other and feature a spacer or clamping washer. Compared to a standard cylindrical nut, this design therefore offers reduced axial compliance and lower backlash.
Nominal-Ø (mm)
Lead (mm)
Dynamic load rating (kN)
Static load rating (kN)
Rigidity K (N/µm)
Nominal-Ø (mm)
Lead (mm)
Dynamic load rating (kN)
Static load rating (kN)
Rigidity K (N/µm)
Design and maintenance guidelines
Design and maintenance guidelines
Materials
Our Ball Screws are manufactured from high-quality case-hardening materials. The screw shafts are made of quenched and tempered steel (according to DIN 17006: 50CrMo4 or Cf53), while the nuts are made of bearing steel (GCr15, GCr15SiMn, or 20CrMo). A precise heat treatment process ensures a consistently high hardness of the raceways of 60 ± 2 HRC.
For special requirements, e.g. in the food or medical technology sectors, stainless steel versions are also available on request.
Installation and design guidelines
To ensure optimal performance and a long service life, please observe the following points during design and installation:
- Screw end: Design the screw end so that at least one end features a full thread. The outer diameter of this end must be at least 0.2 mm smaller than the root diameter of the thread to allow mounting of the nut.
- Alignment: The screw axis must be aligned precisely parallel to the guide rails.
- Mounting position: During assembly, the nut should be positioned as close as possible to the bearing. For long-term storage, we recommend hanging the screw vertically to prevent bending due to its own weight.
- Ambient temperature: The permissible operating range is –20 °C to +80 °C.
Lubrication
Proper lubrication is critical for the performance and service life of your Ball Screw.
- Lubricant selection: The choice between oil and grease lubrication depends on speed, ambient temperature, and load. Please ensure that different lubricant types (especially greases) are not mixed.
- Grease quantity: As a guideline, fill approximately one-third of the free internal volume of the nut with grease.
- Oil quantity (guideline values): The table below shows the recommended oil quantities depending on the screw diameter. The relubrication interval is approximately 3 minutes during operation.