300mm Ball Screw SFU1605 300mm Ballscrew RM1605 5mm Pitch - Precision

In this review the 300mm Ball Screw SFU1605 is evaluated for hobbyist and light industrial CNC builders who need a precise, compact linear drive. The bottom line: this kit delivers a well machined RM1605/SFU1605 ballscrew with C7 precision and a preassembled ballnut housing that reduces starting torque, making it useful for retrofit and custom machines where smooth, low-friction linear travel matters most.

Key Features

• 300mm length: The 11.8 in overall length includes end machined sections ready for immediate installation in short travel axes.
• RM1605 / SFU1605 profile: The 16 mm diameter and 5 mm pitch strike a balance between stiffness and resolution for small CNC gantries.
• C7 precision finish: A shiny, matched surface reduces friction and wear so the screw lasts longer under regular use.
• DSG16H ballnut housing: The preinstalled housing gives minimum starting torque and simplifies mounting compared with loose components.
• BK12 and BF12 supports: Included end supports provide proper bearing support and alignment for reliable axial motion.
• 6.35 x 10 mm coupler: A standard coupler is supplied so the screw can be coupled directly to common stepper or servo motor shafts.

Who It's For

This product suits makers, small CNC builders, and robotics hobbyists upgrading linear axes where a compact, durable screw is required. Its low starting torque and matched nut housing help on projects with modest motors or tight torque budgets.

It is less suitable for heavy industrial presses or long-travel machines where larger diameter screws and different precision grades would be appropriate. If your application demands extreme axial load capacity or long stroke lengths, consider a larger series ballscrew.

Pros & Cons

Pros

• High surface finish and C7 precision improve smoothness and reduce wear over time.
• Complete kit with BK/BF supports and coupler reduces sourcing and assembly time.
• DSG16H ballnut housing lowers starting torque so smaller motors can be used.
• Compact 300 mm overall length ideal for retrofit into short-travel machines.

Cons

• Not intended for heavy loads or very long travel where a larger diameter or different pitch would be preferable.

Specifications

Model	SFU1605 / RM1605
Overall length	300 mm (11.8 in) including machined ends
Diameter	16 mm
Pitch	5 mm
Ballnut housing	DSG16H
End supports	BK12 and BF12
Coupler	6.35 x 10 mm

Our Verdict

The SFU1605 300 mm ballscrew kit is a sensible value for hobbyists and small machine builders who need a durable, low-torque linear drive in a compact form. It combines a matched C7 finish screw, DSG16H ballnut housing and support hardware so installers save time and get predictable performance for light to moderate loads.

Frequently Asked Questions

Can I remove the ballnut from the screw?
It is advised not to remove the ballnut because the nut and screw are matched; removing it may make reinstallation difficult.

What motor shaft fits the supplied coupler?
The supplied coupler fits a 6.35 mm (1/4 in) motor shaft to a 10 mm screw end or matching adapter as provided.

Is this suitable for long travel CNC axes?
For long travel or heavy load axes, a larger diameter series would be a better choice; this 300 mm SFU1605 is optimized for compact, short-travel applications.