20mm Ballscrew SFU2005 RM2005 2000mm 5mm Pitch - Precision CNC Part

In this review of the 20mm Ballscrew SFU2005 RM2005, the author evaluates a long, precision ball screw aimed at CNC builders and retrofitters who need a low-friction, high-stiffness lead screw for linear motion. The bottom line: this 78.74 in / 2000mm, 5mm-pitch unit delivers accurate positioning and reduced drive torque compared with sliding alternatives, making it a practical choice where repeatable movement and low noise matter. The review focuses on real-world use, durability, and whether the C7 precision and included metal nut justify choosing this item for machinery upgrades.

Key Features

• 20mm diameter: Provides a compact, rigid shaft that balances load capacity with ease of integration into small to mid-size machines.
• 5mm pitch: A commonly used lead that offers sensible tradeoffs between speed and resolution for CNC tables and Z axes.
• 2000mm length: Long stroke capability suitable for extended travel applications without field splicing.
• C7 precision grade: Manufactured to a consistent tolerance level that improves repeatable positioning over generic rolled screws.
• Metal nut with deflector: Reduces contamination and extends service life while maintaining low friction and minimal stick-slip.

Who It's For

This ballscrew is aimed at hobbyist and professional CNC builders, retrofit shops, and industrial users who need a long, rolled-thread ball screw with standard end machining for BK/BF15 supports. It suits applications where heat buildup, starting torque, and noise must be minimized while keeping good static and dynamic stiffness.

Users who require ultra-high tolerance (for example, aerospace inspection fixtures) might prefer a higher precision grade like C5, which the manufacturer can supply on request. Those who need a preassembled driven system with gearbox or integrated motor coupling should look elsewhere for a complete package.

Pros & Cons

Pros

• Low friction design reduces driving power and keeps operation quieter than sliding screws.
• High static and dynamic stiffness improves positioning accuracy during acceleration and deceleration.
• Long 2000mm length and standard BK/BF15 end machining simplify installation into common support blocks.
• No stick-slip effect and smaller starting torque enable reliable micro-feeding at low speeds.

Cons

• The supplied precision grade is C7; users needing tighter tolerances should request C5.
• As a bare screw and metal nut, additional components such as couplings, seals, and mounting hardware are required for a finished axis.

Specifications

Our Verdict

The SFU2005 RM2005 20mm ballscrew is a solid, value-focused choice for CNC builders who need a long, rolled-thread shaft with reliable low-friction performance and reduced drive power. It offers practical stiffness and precision for most wood, metal, and hobby-grade machining tasks; professionals needing tighter tolerances should request the higher-grade option. Overall, it represents sensible value when paired with appropriate supports and a compatible nut mounting strategy.

Frequently Asked Questions

Is the nut included?
Yes, the package includes one metal deflector ballscrew nut with the screw.

Can I get a different precision grade?
Yes, the seller can provide C5 grade if you contact them for that option.

Is the screw pre-machined for supports?
Yes, it arrives with standard end machining for BK/BF15 support blocks.