Ballscrew Assembly

Product Specifications

Technical details and manufacturing context for Ballscrew Assembly

Definition

A ballscrew assembly is a precision mechanical component used in machinery and equipment manufacturing, particularly within the Z-axis ram/spindle system of machine tools. Its primary function is to convert rotational motion into linear motion with high efficiency and minimal friction, enabling precise positioning and force transmission for the spindle's vertical movement. The assembly consists of a screw shaft with a helical raceway and a nut containing recirculating ball bearings. As the screw rotates, the balls roll along the raceway, causing the nut (or the screw, depending on configuration) to translate linearly with high precision and efficiency, minimizing backlash and friction compared to traditional leadscrews.

Typical specifications for ballscrew assemblies include nominal diameters ranging from 16 to 80 mm, leads from 5 to 40 mm, dynamic load ratings from 5 to 120 kN, and static load ratings from 10 to 250 kN. Travel accuracy grades range from C3 (high precision) to C7 (general use), with backlash values from 0 to 0.05 mm (zero for preloaded assemblies). Maximum rotational speed is typically 3000–6000 rpm, and operating temperature ranges from -20°C to 80°C; above 80°C, special lubrication is required. Common materials include alloy steel (e.g., GCr15, 55CrMo) and stainless steel, with shaft and nut often made of GCr15 (equivalent to AISI 52100). Mounting types include fixed-supported, with other options such as fixed-fixed or supported-supported. Lubrication is typically grease, but oil may be used for high-speed applications. Weight ranges from 2 to 50 kg depending on diameter and length.

These parameters are provided as reference ranges and must be verified with the manufacturer for specific models and applications. Standards such as ISO 3408 and GB/T 18254 are referenced for procurement and verification, but do not imply certification or compliance. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The ballscrew assembly operates on the principle of recirculating ball bearings. A screw shaft with a helical raceway is paired with a nut containing ball bearings that recirculate through the raceway. When the screw rotates, the balls roll along the raceway, reducing friction and backlash. The nut (or screw) then translates linearly with high precision and efficiency. The recirculation path allows continuous rolling, enabling smooth motion and high load capacity.

Common Materials

Alloy Steel (e.g., GCr15, 55CrMo), Stainless Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	16–80 mm	Determines load capacity and stiffness.ISO 3408
Lead	5–40 mm	Affects linear speed and resolution.ISO 3408
Dynamic Load Rating	5–120 kN	Basis for fatigue life calculation.ISO 3408
Static Load Rating	10–250 kN	Maximum load without permanent deformation.ISO 3408
Travel Accuracy Grade	C3–C7	C3 for high precision, C7 for general use.ISO 3408
Backlash	0–0.05 mm	Zero for preloaded assemblies.
Maximum Rotational Speed	3000–6000 rpm	Limited by critical speed and DN value.
Operating Temperature	-20–80 °C	Above 80°C requires special lubrication.
Lubrication Type	Grease	Grease for most applications; oil for high speed.
Mounting Type	Fixed-Supported	Other options: fixed-fixed, supported-supported.
Shaft Material	GCr15	Equivalent to AISI 52100 bearing steel.GB/T 18254
Nut Material	GCr15	Same as shaft for hardness and wear.GB/T 18254
Weight	2–50 kg	Depends on diameter and length.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Screw Shaft Part
The rotating element with a precision-ground helical raceway that guides the ball bearings.

Material: Alloy Steel (hardened and ground)
Ball Nut
The housing that contains the ball bearings and recirculation system, translating along (or holding) the screw shaft.

Material: Alloy Steel
Ball Bearings Part
Precision spheres that roll between the screw and nut raceways to transmit force with minimal friction.

Material: Chrome Steel (GCr15)
Ball Return System
Internal channels (deflectors or tubes) that recirculate the balls from one end of the nut raceway to the other.

Material: Steel or Plastic
Wipers/Seals Part
Protect the internal raceways from contamination by dust, chips, and debris.

Material: Rubber or Polyurethane

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Z-axis Ram/Spindle

View system integration details

Manufacturers of Ballscrew Assembly

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 16 September 2026

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Frequently Asked Questions

What is the typical nominal diameter range for a ballscrew assembly?

According to the directory reference, nominal diameters range from 16 to 80 mm, as per ISO 3408. However, the exact value depends on the specific model and application, so always verify with the manufacturer.

What does the travel accuracy grade indicate?

Travel accuracy grades range from C3 (high precision) to C7 (general use), as per ISO 3408. This grade affects positioning accuracy and must be selected based on the machine tool's requirements. Confirm the grade with the supplier for your specific needs.

What materials are commonly used for ballscrew assemblies?

Common materials include alloy steel (e.g., GCr15, 55CrMo) and stainless steel. The shaft and nut are often made of GCr15, equivalent to AISI 52100 bearing steel, as per GB/T 18254. Material selection affects hardness and wear resistance.

How does operating temperature affect the ballscrew assembly?

The typical operating temperature range is -20°C to 80°C. Above 80°C, special lubrication is required to maintain performance. Always check the manufacturer's specifications for temperature limits and lubrication recommendations.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	No direct pressure rating (mechanical component), but axial load capacity typically 5-50 kN depending on size
other spec:	Maximum linear speed: 1-3 m/s, positioning accuracy: ±0.01-0.05 mm, life expectancy: 10,000-20,000 km travel
temperature:	-20°C to 120°C (standard), up to 200°C with special seals/lubrication

Product Specifications

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Compliance & Manufacturing Standards