Precision Linear Shafts

The linear shaft guides plain bearings to enable smooth and accurate straight-line motion. It ensures stability and precision, making it essential for machinery and automation systems.

Baokun‘s precision linear shafts are designed to meet international standards, offering great performance and durability. Made from strong materials and treated with heat, these shafts have accurate outside diameter dimensions, high straightness, and smooth surface finishing.

Get A Free Quote

Products Categories

Honed Tube

Special-shaped Tube & Pipe

Chrome Plated Rod

Seamless Steel Pipe

Carbon Steel Pipe

Alloy Steel Pipe

Seamless Steel Tube

Precision Steel Tube

Get A Free Quote

Descriptions of Chrome Plated Linear Shaft

Linear shafts (linear motion shafts or linear guide shafts) are precision-engineered cylindrical components used in motion systems to provide smooth, guided linear movement. They are essential in applications like automation, robotics, and machinery, where accuracy and stability are critical.

Our precision linear shafts involves applying a thin layer of chromium to a surface to improve hardness, wear resistance, and corrosion protection. Chrome plating also provides a smooth, low-friction finish ideal for dynamic environments.

We have a large inventory available for fast shipping. Additionally, we can customize products to meet your specific needs.

Types of Precision Linear Shafts We Make

Hardened linear shaft

This linear shaft is made from steel that has undergone a heat treatment process, to increase their hardness and wear resistance. It is widely used in the moving part of industrial robots and automatic sliding system devices.

Increased Wear Resistance
Improved Strength
Longer Lifespan

Material:	Gcr 15, sus 404c, sus 304
Hardness:	Hrc 60±2
Hardening layer depth:	0.8 – 3mm
Surface roughness:	Ra 0.10m – 0.35m

Non-hardened linear shafts

A steel shaft that has not undergone heat treatment. They are generally softer and more malleable compared to hardened shafts.

Lower Wear Resistance
Easier to Machine
Less mechanical strength

Material:	1045 or 40cr or Gcr13
Hardness:	Hb 220-260
Hardening layer depth:	less than 0.15mm/1000mm
Chromium plating thickness:	0.02-0.05mm

Solid linear shafts

Solid linear shafts offer high strength and exceptional resistance to bending. These shafts are ideal for applications that demand durability and precise motion

Hollow linear shafts

Hollow linear shafts are typically used to reduce weight while maintaining structural integrity. Their interior is suitable for inserting measuring wires, compressing air, adding lubricating oil, or for use in robotic arms.

Threaded linear shafts

Threaded linear shafts feature external threads at one end or both ends, allowing for easy coupling with nuts, bearings, or other threaded components.

Taped linear shafts

Tapped linear shafts have internal threads (tapped holes) at one end or both ends. These threaded holes allow for the attachment of components using bolts or screws, offering flexible mounting options for various systems.

Performance Index of Precision Linear Shafts

OD	Diameter Tolerance	Straightness Tolerance	Surface Roughness	Hardening Depth	Double Chamfer	Weight	Max Length
mm	μm（g6）	μm/m	μm	mm	mm	kg/m	mm
3	-2～-8	60～-100	0.8～ 1.6	> 1.0	0.3	0.06	300
4	-4～-12					0.1	400
5						0.16	500
6						0.23	600
8	-5～-14				0.5	0.4	1000
10	-5～-14	100～-150				0.62	1500
12	-6～-17					0.89	2500
13						1.04	3000
16					0.7	1.58	3000
20	-7～-20			> 1.5		2.47	3000
25				> 1.5		3.85	3000
30				> 2.0	1	5.55	3000
35	-9～-25			> 2.0		7.55	4000
40				> 2.5		9.87	4000
50				> 2.5	1～1.5	15.4	5000
60	-10～-29			> 3.0		22.2	5000
80	-10～-29					39.5	5000
100	-12～-34				1.5	61.7	6000
120	-12～-34					88.8	6000
150	-14～-39					139	6000

FAQs

1. Which is better: Hollow Shaft vs Solid Shaft

Hollow shafts are generally lighter than solid shafts for the same outer diameter, making them easier to handle and install. This weight reduction can lead to lower overall system costs due to decreased support requirements.

While solid shafts typically exhibit higher tensile strength due to their full cross-sectional area, hollow shafts can carry similar loads while being more efficient in terms of torque-to-weight ratio. This efficiency arises from the distribution of material, which allows hollow shafts to withstand torsional loads effectively

Hollow shafts are often preferred in applications where weight reduction is critical, such as in automotive and aerospace industries, while solid shafts may be used in situations requiring maximum strength and rigidity

2. What is a linear shaft?

A linear shaft is a rigid, straight, precision-engineered rod used in mechanical systems for linear motion and load support. These shafts are essential in applications requiring smooth and accurate movement along a straight path, such as in CNC machines, 3D printers, and robotics. Typically cylindrical, they are paired with linear bearings or bushings to minimize friction. Linear shafts guide and support loads, enabling precise positioning. Designed to withstand both axial and radial loads, they are versatile components in industrial automation. The quality of the shaft and its components directly impacts the efficiency and performance of the system.

3. What is the best material for a linear shaft?

Choosing the best material for a linear shaft depends on the application and environmental conditions. Common materials include:

Carbon Steel: Known for high strength and durability, ideal for heavy-duty applications. Can be hardened for improved wear resistance.
Stainless Steel: Offers excellent corrosion resistance, making it suitable for environments exposed to moisture or chemicals. Common in food processing and medical equipment.
Alloy Steel: Contains elements like chromium and nickel for enhanced strength and toughness, ideal for high-stress applications.
Chrome-Plated Steel: Enhances corrosion resistance and surface hardness, beneficial in harsh environments or for reduced friction.

Choosing the right material balances strength, corrosion resistance, weight, and cost for optimal performance.

4. Why are linear shafts hardened?

Linear shafts are hardened to enhance their wear resistance, strength, and durability in demanding applications. Hardening creates a tough outer surface that resists abrasion and deformation, ensuring smooth and precise movement when paired with bearings or bushings. This process is vital in applications involving high loads, frequent friction, or repetitive motion, such as CNC machines or robotics. By improving surface hardness while maintaining a flexible core, hardened linear shafts ensure reliability, reduce maintenance needs, and extend the overall lifespan of the system.