20mm Ballscrew SFU2005 RM2005 1280mm 5mm Pitch - High Precision CNC

In this review of the 20mm Ballscrew SFU2005 RM2005 the bottom line is simple: this is a precision mechanical component aimed at hobbyists and light industrial CNC builders who need low-friction, accurate linear motion over a long span. The reviewer found the 20mm diameter shaft, 5mm lead and 1280mm total length deliver stable travel with reduced starting torque and little heat buildup, and the included metal nut with standard BK/BF15 end machining makes installation straightforward on compatible machines. This is a focused, no-frills part for projects where repeatable positioning and long service life matter.

Key Features

• 20mm diameter: Provides a compact but stiff shaft suitable for light to medium load linear stages while keeping overall weight low.
• 5mm pitch lead: Balances speed and resolution so users can run higher feed rates without sacrificing reasonable positional accuracy.
• 1280mm total length: Offers a long travel capability for extended gantries or custom CNC tables without coupling multiple shorter screws.
• Precision C7 grade: Ensures consistent nut-to-shaft fit and repeatable positioning for shop fixtures and DIY machines.
• Rolled thread GCr15 steel: Delivers long service life with low friction and reduced operation noise compared with sliding alternatives.
• Standard BK/BF15 end machining: Simplifies mounting to compatible bearing blocks and end supports for quicker integration.

Who It's For

This ballscrew suits hobby machinists, small CNC fabricators and automation tinkerers who need a long, precision rolled screw for linear motion with lower heat and small starting torque. It is especially useful when a single continuous length of 1280mm is preferred over assembled segments.

Those building heavy industrial machinery or systems requiring tighter tolerances than C7 should look for alternative grades and heavier diameter screws; likewise, if you need a preloaded anti-backlash assembly with integrated bellows or specific end forms beyond BK/BF15, consider asking the seller for customization or a different model.

Pros & Cons

Pros

• Low friction ball motion reduces heat and driving power for smoother continuous travel.
• High static and dynamic stiffness yields more accurate positioning compared with sliding screws.
• Standard end machining for BK/BF15 and included metal nut make installation easier for common setups.
• Factory seller offers customization and wider product range if other lengths or grades are needed.

Cons

• C7 precision is suitable for many applications but not as tight as C5 when the highest accuracy is required.
• Long single-piece length may be cumbersome to handle during installation on compact workspaces.

Specifications

Model	SFU2005 RM2005
Diameter	20mm
Lead / Pitch	5mm
Total length	1280mm (50.39 in)
Nut type	Metal deflector ballscrew nut (included)
Material	GCr15 steel, rolled thread
Precision grade	C7 (C5 available on request)

Our Verdict

The 20mm Ballscrew SFU2005 RM2005 is a pragmatic choice for DIY CNC builders and light industrial users who need a long, durable linear actuator with low starting torque and quieter operation. It delivers good stiffness and repeatability for the price, and factory customization options make it a sensible long-term part for projects that may later require alternative lengths or tighter grades.

Frequently Asked Questions

Does this come with end machining for standard supports?
Yes, it is supplied with standard end machining for BK/BF15 bearing supports to simplify mounting.

What precision grade is supplied?
The screw is supplied in C7 grade; the seller can provide C5 grade on request for tighter tolerances.

Is a nut included and what type is it?
A metal deflector ballscrew nut is included with the screw in the package for immediate installation.