Linear Motion Shaft

A linear motion shaft is a precision-ground round shaft used as the running surface for linear bearings, bearing blocks, and other linear motion components. The shaft diameter tolerance, surface finish, hardness, and straightness directly affect bearing fit, running resistance, vibration, and guiding stability.

DLY linear motion shafts are used in industrial automation equipment, packaging machinery, CNC auxiliary systems, printing equipment, inspection fixtures, and other applications requiring smooth guided movement.

Key features of linear motion shafts include:

• Precision Ground Surface: A controlled shaft surface helps linear bearings move smoothly and consistently.
• Multiple Material Options: GCr15 bearing steel and C45 steel are the main material options. Other materials are available only after technical confirmation.
• Different Shaft Structures: Standard solid shafts, chrome-plated shafts, soft shafts, hollow shafts, and drawing-based machined shafts are available for different applications.
• Bearing Compatibility: Shafts can be supplied for use with linear bearings, bearing blocks, and shaft support units.
• Custom Processing: Cutting, chamfering, drilling, tapping, external threading, flats, grooves, and stepped ends can be produced according to drawings.
• Wide Size Range: Standard and custom diameters are available. Shaft length must be confirmed according to the diameter, material, straightness requirement, machining structure, and transportation conditions.

Linear motion shafts are essential components in industrial automation and precision equipment, providing reliable performance and extending the lifespan of machinery.

For more details on linear shafts, click here to explore our full range of products.

• Material: GCr15 (Bearing Steel)
• Hardness: HRC 62 ± 2
• Precision (Tolerance): h6 / h7 / g6
• Surface Roughness: Ra 0.4 – 0.8 μm
• Hardening Layer Depth: 0.6 mm – 3.5 mm
• Available Length: 1000 mm – 7000 mm
• Straightness: ≤5 μm per 100 mm

Types

Conventional Shafts:

WCS – Bearing Steel

WFS – High Carbon Steel

WAG – Stainless Steel

Standard Chrome-Plated Shafts:

WDCS – Bearing Steel

WDFS – High Carbon Steel

Soft Shafts:

WECS – Bearing Steel (Soft Shaft)

WEFS – High Carbon Steel (Soft Shaft)

Note:

• The factories marked with colored ■ can provide all lengths of the specified sizes. Products are available in materials such as 20CrMo, 40CrMo, etc.
• The standard material is bearing steel; upon customer request, the material can also be changed to 45# steel, high-carbon steel, 40CrMo, or stainless steel. However, the surface hardness will vary accordingly.
• If a hard chrome-plated shaft is required, please indicate it on the order form.
• If the customer requires threaded holes at both ends or other mating dimensions, please specify them in the technical requirements or on the order drawing.
• WDP hollow shafts are also available.

1. Standard Linear Motion Shaft

Standard linear motion shafts are designed to work directly with linear bearings. Because the bearing balls run on the shaft surface, diameter tolerance, surface roughness, roundness, straightness, and hardness are important to smooth operation and bearing life.

This type is commonly used in automation equipment, inspection fixtures, packaging machinery, printing equipment, and other general linear-motion assemblies.

2. Chrome-Plated Linear Motion Shaft

Chrome-plated linear shafts have a hard chrome surface applied to the steel shaft. The coating can improve surface wear resistance and provide additional protection in environments where moisture or light corrosion may be present.

The required chrome thickness, final diameter tolerance, and surface hardness should be stated when ordering because the coating affects the finished shaft dimensions.

3. Chrome-Plated Soft Shaft

A chrome-plated soft shaft has a machinable core combined with a chrome-plated surface. It may be selected when additional end machining or structural modification is required after the shaft blank is produced.

This shaft type should not automatically be treated as equivalent to a fully hardened bearing shaft. The matching bearing, surface hardness, load, and working conditions must be confirmed before use.

4. Chrome-Plated Hollow Shaft

A hollow linear shaft reduces component weight and provides an internal passage that may be used for cables, air lines, lubrication lines, or other machine components.

Hollow shafts require individual technical confirmation because wall thickness, outside diameter, straightness, load, support spacing, and end machining all affect shaft rigidity.

5. Stainless Steel Linear Shaft

Stainless steel linear shafts may be considered for applications exposed to moisture, cleaning processes, or corrosive environments. However, stainless steel grade, hardness, wear resistance, and corrosion resistance vary significantly.

Customers should provide the operating environment, matching bearing, load, and required stainless steel grade before the shaft is selected.

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