Ball Screw Nuts

The ball screw nuts, as a core functional component of precision transmission systems, plays a central role in efficiently and accurately converting rotational motion into linear motion. With its precise spiral groove structure design, this key component achieves an organic unity of transmission accuracy, motion stability, and load capacity in high-end fields such as machine tools, automation equipment, and aerospace, making it an indispensable basic transmission unit in modern precision mechanical systems.

The core components of a ball screw nuts include the screw shaft, nut, ball bearings, and return guide device (ball returner). The surfaces of both the screw shaft and nut are machined with arc-shaped spiral grooves, which form a spiral raceway when assembled. The raceway is filled with ball bearings. This structural design replaces traditional sliding friction with rolling friction of the balls, significantly reducing transmission resistance. Moreover, the ball returner guides the balls to complete a cyclic motion, enabling the conversion from rotational to linear motion with both high precision and reliability. It has become a typical structural paradigm in the field of precision mechanical transmission.

 Product Characteristics of Ball Screw Nuts

1. High Transmission Efficiency

>90% transmission efficiency
DLY ball screw nuts adopt a rolling-friction design, achieving transmission efficiency above 90 %-far exceeding the 20 – 40 % efficiency of traditional sliding screws.

Low friction loss
Thanks to the smooth rolling motion of precision-ground balls, the driving torque is only 1/3 that of sliding screws. This reduces power consumption and allows smaller motor sizes, improving system efficiency.

2. High Precision and Stable Motion

Micron-level positioning accuracy
Each nut is precision-ground and preloaded to eliminate axial clearance, ensuring repeatable accuracy and smooth feed control in CNC and automation systems.

Smooth movement without stick-slip
The small difference between static and dynamic friction torque ensures smooth movement even at extremely low speeds-ideal for precision micro-feed applications.

3. High Rigidity and Load Capacity

Negative-clearance preloading design
DLY ball screw nuts adopt a preloaded "negative clearance" structure to increase axial rigidity and resist vibration and external impacts.

Heavy-duty load support
Optimized raceway geometry and high-hardness steel balls allow excellent axial load capacity, perfectly suited for machine tools, stamping presses, and heavy-load applications.

4. High-speed Motion Adaptability

Rapid acceleration performance
Capable of over 10 g acceleration, the nuts maintain stability in high-speed linear motion applications such as CNC machines, semiconductor and automation equipment.

Excellent temperature control
The low-friction design minimizes heat generation and ensures dimensional stability even during prolonged high-speed operation.

5. Bidirectional Transmission & Long Service Life

Reversible transmission
Supports efficient two-way conversion between rotary ↔ linear motion, enabling flexible mechanical designs.

Long wear-resistant lifespan
The combination of quenched balls and hardened raceways minimizes wear and maintains precision for extended use.

6. Design Notes

Non-self-locking: Requires additional braking when used in vertical installations.

Higher precision cost: Advanced materials and precision grinding increase manufacturing cost but ensure superior performance and reliability.

7. Diverse Structural Designs

Flexible circulation systems

• External circulation (pipe / end-cap type): Ideal for large-size or heavy-load designs.
• Internal circulation: Compact and space-saving, suitable for limited installation spaces.

Advanced production process
The cold-rolling forming process enhances mass-production efficiency while meeting green-manufacturing standards such as T/GDMIA 003-2019.

Application Scenarios of Ball Screw Nuts

1. Precision Manufacturing Industry

CNC Machine Tools
Ball screw nuts are widely used in lathes, milling machines, and drilling centers for precise feed and positioning control.
They ensure micron-level machining accuracy, high repeatability, and smooth linear motion-making them essential in modern CNC systems.

Semiconductor Equipment
In lithography and wafer-cutting machines, DLY ball screw nuts drive precision stages that demand nanometer-level positioning accuracy and exceptional motion smoothness.

2. Automation and Robotics

Industrial Robotic Arms
Serving as the core transmission component, ball screw nuts convert servo motor rotation into accurate linear or joint motion, ensuring the robot's end effector follows precise trajectories.

Automated Production Lines
Applied in handling robots, pick-and-place machines, and assembly systems, they enable high-speed gripping, loading, and positioning, effectively improving productivity and automation reliability.

3. High-precision Instruments and Medical Devices

Precision Measuring Instruments
Ball screw nuts enable micron-level displacement control in coordinate measuring machines (CMMs), optical instruments, and laser calibration systems.

Medical Equipment
Used in surgical robots and medical imaging systems, ball screw nuts ensure stable motion control and repeatable accuracy during critical operations such as scanning and positioning.

4. Aerospace and Heavy Industry

Flight Control Systems
In aircraft actuation systems, ball screw nuts drive the flap and tail rudder mechanisms, providing smooth, reliable linear motion under demanding environments.

Heavy Machinery and Molding Equipment
Used in all-electric injection molding machines, hydraulic presses, and stamping machines, they deliver high load-bearing capacity and stable transmission for heavy-duty operations.

5. Specialized Industrial Applications

New Energy Systems
Applied in photovoltaic panel positioning and solar tracking systems, achieving precise and durable alignment control.

Electronics Manufacturing
Used in 3D printers, SMT chip mounters, and PCB assembly lines, ensuring high-speed accuracy and reliable part placement.

Quality Control System

At Zhejiang DLY Automation Manufacturing Co., Ltd., we maintain a comprehensive quality control system to ensure that every ball screw nut meets the highest standards of precision and reliability. Our process covers the entire production chain-from raw materials to final delivery.

1. Positioning Accuracy Verification

We use high-precision testing instruments to perform dynamic and static positioning error calibration, ensuring smooth and precise operation in your transmission system.

2. Pitch Control

Micron-level measurement and adjustment of thread parameters are conducted using a pitch projector, strictly controlling lead accuracy to meet design specifications.

3. Hardness Testing

Multi-point sampling is performed on the surface-hardened layer using a hardness tester, guaranteeing that the material's mechanical properties meet international standards and maintain long-term wear resistance.

4. Straightness Calibration

Professional straightening machines precisely correct the screw shaft, controlling straightness errors within the micron-level range for optimal linear motion performance.

5. Independent Quality Control Department

Our dedicated QC team oversees the entire manufacturing process: incoming inspection of raw materials, in-process monitoring, and final product verification. This standardized approach ensures that every ball screw nut delivered is of high precision, high reliability, and consistent quality.

1. Production Cycle of Ball Screw Nuts

Due to millimeter-level precision machining, the production cycle of ball screw nuts is longer than ordinary transmission components. Typically:

7–30 days, depending on:

Product precision grade

Specification and size (especially length)

Order quantity

We ensure on-time production without compromising quality, even for high-precision custom orders.

2. Packaging and Transportation

Packaging Standards

Precision ball screws are packed in custom wooden cases with shock-absorbing materials.

Components are protected from impacts and vibrations during shipping.

Logistics Channels

Small-batch orders: Shipped via international express carriers with door-to-door service and full tracking.

Large-batch orders: Sea freight with professional container reinforcement for cargo safety and cost efficiency.

3. Export Experience & Global Service

Cross-border Trade Advantages
With over a decade of export experience, DLY has established a mature supply chain serving high-end markets in Europe and North America, manufacturing hubs in Southeast Asia, and precision machinery sectors in Japan and South Korea, covering 50+ countries worldwide.

End-to-end support:

Order confirmation → Customs documentation → Commodity inspection → Customs clearance → Delivery tracking

Cooperation with international logistics partners and local customs ensures fast, reliable delivery

Annual export customs clearance efficiency exceeds 98%

Core Service Highlights

Global Network: Logistics and customs channels covering North America, EU, ASEAN, Japan, South Korea

Full-process Control: One-stop closed-loop services from booking → customs declaration → inspection → clearance → distribution

Timeliness Guarantee: Urgent orders handled via cross-border green channels, enabling customs clearance and delivery in as fast as 3 working days

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