Aluminium Slitting Machine Differential Air Shaft Expandable Shaft

The AstraRoll aluminum differential air shaft is a precision expandable core shaft designed for the unwinding and rewinding stations of slitting machines, slitter-rewinders and converting lines. With a straight bearing structure and a lightweight aluminum body, it grips cores firmly at controlled torque while remaining easy to load and unload - cutting downtime on every roll change.

Each shaft is machined from a solid aluminum body and fitted with bearings as the core component, then coated for wear and corrosion resistance. Whether you are converting paper, film, foil, labels or non-woven fabric, the AS-DA series holds your material rolls true at high speed, with minimal vibration and repeatable tension.

Key Features

• Lightweight aluminum body - reduces operator effort and spindle load; optional stainless steel or 45# steel for heavier duty
• Straight bearing design - smooth, concentric rotation with high precision for high-speed slitting
• Differential slip control - each core position holds its own torque, preventing film wrinkles and edge damage during rewind
• Expandable grip - inflation expands the surface evenly to lock paper or plastic cores without tools
• HV700 / HV300 hard coating - wear-resistant surface that survives daily core changes; blue oxidation available for special environments
• Custom diameters & lengths - standard 3", 6", 8", 12" or fully custom per your drawing
• Bearing core components - quality bearings fitted as standard, replaceable for long service life
• Machinery test report included - each shaft is tested before shipment, with out-going video inspection available

Technical Specifications

• Type: Differential air shaft (expandable)
• Structure: Straight bearing type
• Body material: Aluminum (standard); stainless steel or 45# steel (optional)
• Diameter: 3", 6", 8", 12", or custom per drawing
• Surface treatment: HV700, HV300, or blue oxidation
• Core components: Bearings (included)
• Torque capacity: Customized to your application
• Weight: From ~10 kg (varies by size)
• Warranty: 1.5 years
• Lead time: 15–20 days (7 days for 1–5 pcs)
• Test report: Machinery test report provided
• Export terms: EXW / FOB / CIF
• Packaging: Export carton or wooden case

Optional Configurations

• Grip type: Lug type · Leaf type · Key type · Plate type
• Coating: HV700 · HV300 · Blue oxidation
• Materials: Aluminum · Stainless steel · 45# steel
• Ends & drive: Keyway, flat, D-cut or as per your machine

Applications

• Slitting and rewinding machines for paper, film, foil and laminates
• Label and tag converting lines
• Unwinding / rewinding shafts for printing presses
• Non-woven fabric and textile converting equipment
• Packaging material converting and die-cutting lines

Quality & Delivery

Every AstraRoll air shaft is manufactured under strict quality control: material inspection, precision machining, dynamic balance check and a final machinery test report before packing. Out-going video inspection is available on request. Standard export cartons or wooden cases protect the shaft in sea freight, and we ship globally under EXW, FOB or CIF terms.

FAQ

Q1. How do I choose the right air shaft diameter?
Match the shaft to your core inner diameter and machine spindle. If you are not sure, send us your core size and a drawing - we will confirm the correct type (lug/leaf/key/plate) and diameter.

Q2. What is the difference between a differential and a standard air shaft?
A differential shaft holds each core position at an independent torque setting, which prevents film tension wrinkles during rewind. Standard air shafts are simpler and cost less where differential slip is not required.

Q3. Can you make non-standard lengths and diameters?
Yes. All shafts can be manufactured per your drawing, including custom diameters, lengths, coatings and end configurations.

Q4. What materials are available?
Aluminum is the standard for lightweight applications. Stainless steel suits cleanroom, food and corrosive environments; 45# steel is recommended for heavy torque loads.

Q5. Do you provide a test report?
Yes, a machinery test report is provided with each shaft, and video inspection can be arranged before shipment.

Q6. What is the lead time and MOQ?
Lead time is typically 15–20 days; 7 days for small quantities (1–5 pcs). Small MOQs are accepted for testing and new projects.

Q1. Are you a trader or direct factory?

We are a direct manufacturing factory with over 20 years of expertise in high-end industrial rollers, casters and material handling solutions. Our facility operates with ISO-certified quality management systems, allowing us to maintain full control over production cycles and quality standards. Throughout two decades of growth, we have established deep, long-term strategic partnerships with several listed companies and global automation leaders, proving our reliability as a high-tier industrial supplier.

Q2. What are your main products?

AstraRoll specializes in the engineering and production of three core product lines: Industrial Rollers, Heavy-Duty Wheels, and Precision Casters. We do not just sell components; we provide integrated movement and transport solutions. Our products are widely utilized across high-demand sectors, including: New Energy, Lithium Battery, Mining, Heavy Industry, Medical Institutional, Agriculture and Logistics.

Q3. What about delivery time?

We deeply understand that project timelines are critical.
Standard Products: Usually dispatched within 7–15 working days if the components are in stock.
Customized/OEM Orders: Depending on the complexity and volume, the lead time typically ranges from 20–35 days. This includes time for technical drawing confirmation, specialized tooling, and rigorous pre-shipment testing.
Shipping Methods: We offer flexible global logistics solutions, including FOB and CIF terms. We ship via Sea Freight (for bulk industrial orders), Air Freight (for urgent project needs), and International Express (DHL/FedEx/TNT) for smaller components or samples.

Q4. How can I get a quote for customized products?

Since a significant portion of our business involves specialized engineering, pricing is tailored to your specific technical requirements. To provide an accurate quote, please provide the following details: Technical Drawings or Sketches, Application Environment, Quantity, Special Requests. Our engineering team typically reviews and responds to custom inquiries with a formal quotation within 24–48 hours.

Q5. What is your payment?

TT / Paypal / Western Union / LC / Credit Card etc. are all available to us.