Ball Screw vs Lead Screw CNC: Which One Should You Buy?

Side by side

Specifications are manufacturer rated, as published on each listing and collected 13 October 2026.

Ball Screw vs Lead Screw CNC: Core Drive Mechanics

A ball screw converts rotary torque into linear motion through recirculating steel balls, substituting rolling motion for sliding friction. In the CHUANGNENG and ANWOKIT listings, the 16 mm SFU1605 design pairs with recirculating ball nuts and BK12 end machining. The makers cite low operating noise and low starting torque. Conversely, VICHSAMWY Tr8x8 and Tr8x2 lead screws rely on direct sliding friction between a SUS304 stainless steel shaft and a brass or copper nut. Sliding contact requires more motor torque, but eliminates loose bearing balls. For alternative drive systems, see our lead screw vs belt drive CNC comparison.

Transmission Efficiency and Backlash

Rolling contact gives ball screws high mechanical transmission efficiency. The ANWOKIT listing highlights an antibacklash nut and absence of stick-slip effect for smooth low-speed feeds. Standard ball nuts like the CHUANGNENG listing rely on close ball fit and may exhibit slight axial play. Lead screws suffer lower efficiency because threads slide continuously. Over time, friction wears brass nuts, creating backlash unless replaced. The VICHSAMWY listings include standard flanged nuts with 4 mounting holes rather than spring-loaded antibacklash nuts.

Pitch, Lead, and Axis Travel Speed

The SFU1605 ball screws have a 5 mm lead, advancing 5 mm per shaft rotation for a practical balance of speed and precision. The lead screw examples differ in lead configuration. The VICHSAMWY Tr8x8 features an 8 mm diameter shaft with a 2 mm pitch and 4 starts, yielding an 8 mm lead for fast travel that can backdrive under spindle weight. The VICHSAMWY Tr8x2 has a 2 mm pitch with 1 start, giving a 2 mm lead whose shallow lead angle and friction resist backdriving on vertical Z axes.

Shaft Diameter, Span, and Axis Rigidity

The CHUANGNENG listing supplies a 1050 mm (approx 41.3 inch) screw weighing 2445 g with BK12 and BF12 mounts. The ANWOKIT listing provides a 500 mm (19.68 inch) screw weighing 1500 g. Both have a 16 mm diameter that resists whipping deflection across wider cutting envelopes. The VICHSAMWY lead screws use an 8 mm diameter: the 400 mm (15.75 inch) Tr8x8 weighs 10.5 ounces per pair, and the 150 mm (5.9 inch) Tr8x2 weighs 4.6 ounces per pair. Over long spans, 8 mm screws flex more under load; for motion support comparisons, read linear rails vs V-wheels.

Assembly Hardware and Mounting Support

Kit contents affect setup time. The CHUANGNENG package includes the 1050 mm screw, a DSG16H nut housing, BK12/BF12 bearing blocks, and a 6.35 mm by 10 mm coupler. The ANWOKIT listing includes a 500 mm screw with BK12/BF12 end machining, an antibacklash nut, and a 6.35 mm by 10 mm coupler, leaving bearing blocks unstated. Both VICHSAMWY listings supply only two screws and two nuts, requiring builders to source couplers, bearing blocks, and motor brackets separately.

Maintenance and Long-Term Durability

CHUANGNENG bullets claim ‘no need to maintenance’, but recirculating ball screws require periodic lubrication to prevent track wear from cutting dust; see our CNC router maintenance guide. Lead screws slide metal on metal, so brass nuts wear gradually against the harder stainless steel shaft and require eventual replacement.

Warranty Coverage and Listing Consistency

Only the VICHSAMWY Tr8x8 listing states a warranty: a 1-Year warranty and a 30-Days money back policy with 24/7 service. CHUANGNENG, ANWOKIT, and VICHSAMWY Tr8x2 state no warranty. Listings also show minor contradictions: CHUANGNENG bullets state carbon steel and aluminum alloy while its table lists carbon steel; ANWOKIT bullets state CF54 steel while its table lists metal; and VICHSAMWY titles state brass nuts while bullets say copper.

Choose a ball screw CNC drive if

• You need high transmission efficiency and reduced motor driving torque.
• You require a 16 mm diameter shaft to prevent whipping over longer spans.
• Minimal backlash (as on the ANWOKIT antibacklash nut) is essential for part accuracy.

Choose a lead screw CNC drive if

• You are building a compact desktop engraver with simple mechanical parts.
• You want a single-start 2 mm lead screw to stop Z-axis drop without brakes.
• You value the stated 1-Year warranty on the VICHSAMWY Tr8x8 listing.

For machine options, see our guide to the best desktop CNC for beginners.

Project Match

• Large router axes: CHUANGNENG SFU1605. Length: 1050 mm (approx 41.3 inch). Work area: Not stated. Stated materials: Carbon steel and aluminum alloy. The 1050 mm screw and BK12/BF12 supports fit long axis assemblies.
• Mid-size rigid milling: ANWOKIT SFU1605. Length: 500 mm (19.68 inch). Work area: Not stated. Stated materials: CF54 steel and metal. High efficiency and an antibacklash nut suit rigid cutting.
• Desktop light carving: VICHSAMWY Tr8x8. Length: 400 mm (15.75 inch). Work area: Not stated. Stated materials: SUS304 stainless steel and copper or brass. Fast 8 mm lead suits rapid travel on hobby machines.
• Vertical Z-axis plunge milling: VICHSAMWY Tr8x2. Length: 150 mm (5.9 inch). Work area: Not stated. Stated materials: SUS304 stainless steel and copper or brass. The 150 mm length and 2 mm lead resist tool backdriving.

FAQ: lasers and CNC

Is a ball screw better than a lead screw for a CNC router?

Ball screws provide higher transmission efficiency, lower driving torque, and longer service life through rolling ball bearings. Lead screws offer simpler construction with fewer parts, but sliding friction causes faster nut wear.

What does SFU1605 mean on a ball screw listing?

SFU1605 designates an SFU ball screw with a 16 mm outer diameter and a 5 mm thread lead, advancing 5 mm per rotation.

Can a lead screw backdrive on a CNC Z-axis?

Yes. Steep leads like the 8 mm lead on the VICHSAMWY Tr8x8 can backdrive under spindle weight. Single-start screws with a 2 mm lead, like the VICHSAMWY Tr8x2, have sufficient thread friction to resist backdriving.

Do ball screws require maintenance?

Yes. Despite claims of no maintenance, rolling ball bearings require regular clean lubrication to clear debris and prevent wear.

What hardware is needed to install a CNC screw drive?

An axis setup requires the screw, nut, bearing blocks, nut housing, and motor coupler. The CHUANGNENG kit includes all of these parts, while the VICHSAMWY listings supply screws and nuts only.

Related: what is a CNC router machine guide, desktop CNC machine for beginners guide, desktop CNC routers, and the complete CNC router guide.