Editorial Technical Reference

Ball Screw Shaft

This page explains how Ball Screw Shaft is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The precision-ground shaft that forms the core of a ball screw assembly, converting rotary motion into linear motion.

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Ball Screw Shaft in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Ball Screw Shaft

Definition
The ball screw shaft is a critical component in ball screw assemblies, which are widely used in industrial machinery for precise linear positioning and force transmission. It is a hardened and ground cylindrical rod with a helical groove (thread) machined along its length. The shaft serves as the primary load-bearing element that interacts with the ball nut, enabling efficient conversion of rotary motion into linear motion. The shaft is typically made from alloy steel (e.g., SCM420, SCM440) or stainless steel, with a hardness of 58–62 HRC (induction hardened) and a ground surface finish of 0.2–0.4 μm Ra for smooth operation. Standard parameters include nominal diameters from 16 to 80 mm, leads from 5 to 40 mm, accuracy grades from C3 to C7 (per ISO 3408), and shaft lengths from 500 to 6000 mm (custom lengths available). Straightness is specified as 0.05–0.1 mm/m (per ISO 1101), and operating temperature ranges from -20 to 80°C. The shaft material may also be specified as GCr15 (equivalent to 52100 bearing steel) per GB/T 18254. Weight varies from 2 to 120 kg depending on diameter and length. These values are reference ranges and must be verified for the specific model and application. The shaft is designed to work with a matching ball nut and recirculating balls, which roll along the helical grooves to minimize friction. It is essential to confirm the actual specifications, including accuracy grade, lead, and material, with the legal manufacturer or supplier before procurement. The shaft is a component, not a standalone product, and its performance depends on proper installation, lubrication, and alignment within the ball screw assembly.
Working Principle
The ball screw shaft operates within a ball screw assembly, where it rotates relative to a stationary or moving ball nut. The nut contains recirculating balls that roll along the matching helical grooves on the shaft. As the shaft rotates, the balls transfer motion to the nut, converting rotary motion into linear motion with high efficiency and minimal friction. The helical groove profile and the precision ground surface ensure smooth engagement and accurate positioning. The shaft's hardness and surface finish contribute to wear resistance and consistent performance over time. The linear travel per revolution is determined by the lead of the shaft. The shaft may be driven by a motor or other rotary actuator, and the nut may be fixed or move along the shaft depending on the application. Proper lubrication and alignment are critical to maintain the recirculating ball path and prevent premature wear.
Common Materials
Alloy Steel (e.g., SCM420, SCM440), Stainless Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Nominal Diameter16–80 mmStandard sizes; custom diameters availableISO 3408
Lead5–40 mmDetermines linear travel per revolutionISO 3408
Accuracy GradeC3–C7C3 for high precision, C7 for general useISO 3408
Shaft Length500–6000 mmCustom lengths up to 6000 mm
Hardness58–62 HRCInduction hardened for wear resistanceISO 683-17
Surface Roughness0.2–0.4 μm RaGround finish for smooth operationISO 4287
Straightness0.05–0.1 mm/mEnsures accurate linear motionISO 1101
Operating Temperature-20–80 °CHigher temps may require special lubrication
Shaft MaterialGCr15Equivalent to 52100 bearing steelGB/T 18254
Weight2–120 kgDepends 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
  • Threaded Section Part
    The precision-ground helical groove that guides the recirculating balls, defining the screw's lead and accuracy.
    Material: Hardened Alloy Steel
  • Shaft Body / Journal Part
    The smooth, unthreaded sections at the ends for mounting bearings and couplings, providing rotational support.
    Material: Alloy Steel

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Axial load capacity: 5 kN to 500 kN depending on diameter and preload
other spec: Maximum linear speed: 3 m/s, Accuracy grade: C3 to C7 per ISO 3408
temperature: -20°C to 120°C (standard), up to 200°C with special materials
Media Compatibility
✓ Machine tool cutting fluids ✓ Industrial lubricating oils ✓ Clean hydraulic fluids
Unsuitable: Abrasive slurry environments without protective seals
Sizing Data Required
  • Required axial load capacity (kN)
  • Maximum travel length (mm)
  • Required positioning accuracy (μm/300mm)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Wear and pitting
Cause: Inadequate lubrication leading to metal-to-metal contact, or contamination from abrasive particles in the environment.
Fatigue fracture
Cause: Cyclic overloading, misalignment causing uneven stress distribution, or material defects from manufacturing.
Maintenance Indicators
  • Audible grinding or clicking noises during operation
  • Visible backlash or excessive play in the linear motion
Engineering Tips
  • Implement a strict lubrication schedule using manufacturer-recommended grease or oil, and ensure seals are intact to prevent contamination.
  • Regularly check and correct alignment with the drive system and mounting surfaces to avoid eccentric loading and premature wear.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 3408-1:2006 (Ball screws - Part 1: Vocabulary and designation) ANSI B5.48-1977 (Ball Screws) DIN 69051-1:2001 (Ball screws - Part 1: General characteristics, designations)

Quoted from the published standard.

Manufacturing Precision
  • Lead accuracy: ±0.01 mm per 300 mm
  • Shaft diameter tolerance: h6 (-0.013 mm to 0 mm)
Quality Inspection
  • Lead accuracy measurement with laser interferometer
  • Hardness testing (Rockwell C scale) of screw shaft surface
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
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Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Manufacturers of Ball Screw Shaft

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Frequently Asked Questions

What materials are available for the ball screw shaft?

The shaft is typically made from alloy steel (e.g., SCM420, SCM440) or stainless steel. The material may also be specified as GCr15 (equivalent to 52100 bearing steel) per GB/T 18254. The choice depends on the application's load, environment, and corrosion resistance requirements.

What accuracy grades are available?

Accuracy grades range from C3 to C7 per ISO 3408. C3 is for high precision applications, while C7 is for general use. The grade affects the positioning accuracy and must be selected based on the required performance.

What is the maximum shaft length?

Standard shaft lengths range from 500 to 6000 mm, with custom lengths available up to 6000 mm. The length affects the straightness and rigidity, so it must be verified for the specific application.

How should I verify the specifications for my application?

Always confirm the model-specific values, including nominal diameter, lead, accuracy grade, material, hardness, and straightness, with the legal manufacturer or supplier. These parameters are critical for proper function and must be validated against your application's requirements.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

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

Linear Guideways & Ball Screws
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

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

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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 12 October 2026

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