16mm Ballscrew SFU1604 RM1604 400mm 4mm Pitch - Precision Linear

In this review of the 16mm Ballscrew SFU1604 RM1604 the bottom line is simple: this is a precision, low-friction ballscrew for hobbyists and light industrial CNC builders who need accurate linear motion without end processing. The reviewer found the C7 grade rolled-thread construction and 16mm shaft diameter deliver smooth travel and reduced drive power needs, while the included nut makes it ready for integration into a lead screw stage. It is best for users who value low noise, small starting torque and predictable positioning over out-of-the-box finished-end installation.

Key Features

• 16mm diameter: provides a compact but stiff shaft that suits small CNC machines and custom stages with limited space.
• 4mm lead/pitch: balances speed and resolution so users get fine micro-feeding without excessively long travel for each rotation.
• 400mm total length: offers a useful travel span for many desktop to benchtop projects while remaining easy to mount.
• C7 precision grade: gives consistent accuracy for positioning tasks where rolled-thread tolerance is acceptable and cost matters.
• Low friction ball motion: reduces stick-slip, lowers operating temperature, and cuts the driving power required for smoother motion.
• No end processing: enables customers to choose their own machining or coupling style when integrating into custom assemblies.

Who It's For

The SFU1604 is aimed at CNC hobbyists, small machine builders and prototypers who need a reliable, compact ballscrew for linear stages, routers or 3D printer modifications. The included nut and standard length make it straightforward to fit into custom carriages and gantry systems where you can machine or adapt your own end couplings.

It is less suitable for buyers who need finished, drop-in parts with pre-machined ends or flange attachments straight from the supplier; those projects require units with end processing or integrated couplings. Also, users demanding the highest industrial accuracy should consider the offered higher precision grades from the same manufacturer.

Pros & Cons

Pros

• Compact 16mm shaft with good static and dynamic stiffness for small machines.
• Low operation noise and low starting torque due to ball recirculation, improving smooth motion.
• Includes a matching nut and is available in a factory range with customizable lengths and CAD support.
• C7 grade offers a cost-effective balance of precision for many non-critical positioning tasks.

Cons

• No end processing is supplied, so additional machining or coupling hardware is required for direct motor attachment.
• Rolled C7 grade, while accurate for many uses, is not the top-tier C5 finish some industrial users may prefer.

Specifications

Model	SFU1604 RM1604
Diameter	16mm
Lead / Pitch	4mm
Total Length	400mm (15.75 in)
Precision Grade	C7 (rolled thread)
Material	GCr15 steel
Includes	1pcs ball screw and 1pcs ball screw nut, no end processing

Our Verdict

For DIY machinists and small-scale CNC builders the SFU1604 is a practical, value-oriented ballscrew that offers smooth, low-friction motion and reliable positioning in a compact 16mm form factor. It makes sense when you plan to machine your own ends or use custom couplings and when C7 precision is adequate; pay extra for higher grades or pre-processed ends if your project requires them.

Frequently Asked Questions

Does this ball screw include a nut?
Yes, the package contains one ball screw and one matching ball screw nut but does not include end machining.

Is the length customizable?
The manufacturer offers custom lengths and CAD/3D files on request so you can order a different overall length if needed.

What precision grade is supplied?
This listing is C7 grade rolled thread; the seller can provide C5 grade on special request for higher accuracy.