SP Series Hollow Linear Shaft

Technical Details: Materials, Processes, and Selection Guide
1. Material Selection Guide:
GCr15 (Bearing Steel): Recommended for applications subject to high impact loads, high alternating stresses, or requiring extremely high overall rigidity. It has high core strength and superior fatigue resistance.
S45C (Carbon Structural Steel): Recommended for applications where surface wear resistance is the primary requirement and the load is relatively stable. It offers better cost-effectiveness and is the economical choice for most applications.

2. Core Process Chain:
Precision tube manufacturing → High-frequency induction hardening (surface hardening only, core remains tough) → Precision straightening → Centerless grinding of the outer diameter (to specified tolerance) → Hard chrome plating (thickness typically 5-20μm) → Final polishing/straightening.

3. Three Key Steps for Selection:
1. Determine Function and Material: Confirm whether internal wiring is required and select GCr15 or S45C material based on load characteristics.
2. Determine Dimensions:
Outer Diameter and Tolerance: Determine the outer diameter based on the load and linear bearing model, and specify the mating tolerance (e.g., g6 for precision floating, h6 for general guidance).
Inner Diameter: Select the standard inner diameter specification based on the maximum outer diameter of the cables/pipes that need to pass through. 3. Length and Processing: Confirm the total length and whether processing is required at both ends (e.g., threading, drilling, chamfering).

Applications
The SP series hollow linear shaft is designed for the following fields with demanding requirements for wear resistance and reliability:
High-speed automation and robotics: Guide shafts for automotive welding production lines and high-speed packaging machinery, subjected to high-frequency reciprocating motion.
Precision machine tools and logistics equipment: Support and guide shafts for CNC machine tool tool magazines and automated warehouse stacking machines.
Injection molding and die-casting machinery: Arm guide shafts for manipulators and take-out machines, operating in dusty and high-temperature environments.
Any existing linear shaft applications where wear failure leads to frequent downtime and high maintenance costs.

The SP series hollow linear shaft redefines the standard for high-performance linear shafts. It successfully combines the convenience of internal integration, the dynamic advantages of overall lightweight design, and the lasting reliability of superior surface wear resistance. Choosing this product means you no longer have to make painful trade-offs between "function," "performance," and "lifespan." It is both a "smart choice" to upgrade your equipment design and a "reliable anchor" to ensure continuous and stable operation of your production line – a wise investment for future manufacturing.

Important Note: When inquiring or placing an order, please be sure to specify: 1. Material (GCr15/S45C); 2. Outer diameter and tolerance grade; 3. Inner bore standard size; 4. Total length and end processing requirements. This will ensure you receive a product that perfectly meets your expectations.

_Parameters

_{Special Machining for Shaft}

We can offer linear shaft with diameter Φ5mm-Φ150mm.maxium length up to 6000mm.
When you have special requirements on length,we can meet your machining requirements with different length; when you request above 60o0mm,we can anti-connect for you.(Shown in Fig a)


When you have special requirements on machining.such as threading,coaxial holes drilled and tapped,radial holes drilled and tapped,reduced shaft diameter etc,we can machine for you,and these special machines are finished after heat treatment and hard chrome so that ensure the precision of product.Send us your detailed sketch or blue print for prompt quotation, you should be satisfied with our service.



_{Linear Shaft Selection}


Hollow Shaft SP Series

Hollow shaft: the internal diameter and wall thickness can be customized according to customer requirements.
Material: 45 high quality carbon steel (S45C), hardness HRC58-60 GCr15(SUJ2), Rigidity: HRC60-62

Inch Shaft SI Series

_{Metric Solid Shaft HS/SF Series}

Material: 45 high quality carbon steel (S45C),hardness HRC58-60
GCr15 bearing steel (SUJ2), hardness above HRC60-62
9 Cr18 stainless steel (SUS440), hardness above HRC55
The surface can be hard chrome plated