Pneumatic safety chuck STO/STW

for winding shaft

Product overview
The XW Machinery STO/STW and FLO/FLW Safety Chuck is designed for high-speed winding and unwinding systems in printing, slitting, packaging, film converting, lithium battery, textile, and paper industries. Built for stable torque transmission and fast shaft loading/unloading, this industrial safety chuck provides a secure and efficient connection for air expanding shafts while reducing downtime during roll changes. Available in both flange-mounted (FLO/FLW) and foot-mounted (STO/STW) configurations, our safety chucks are manufactured with high-strength alloy steel or lightweight aluminum options to meet different machine requirements.

Key Features

• High torque transmission up to 400Nm
• Fast air shaft loading and unloading
• Compatible with most pneumatic air shafts
• Available in STO/STW and FLO/FLW models
• Custom square hole sizes available
• Heavy-duty alloy steel construction
• Optional lightweight aluminum body
• Stable operation at high winding speeds
• Precision machining for accurate positioning
• Long service life with hardened reel mouth design

Available Types

• STO / STW Safety Chuck — Foot-mounted safety chuck design suitable for rewinding and unwinding systems requiring stable base installation.
• FLO / FLW Safety Chuck — Flange-mounted safety chuck suitable for compact machine structures and side-frame installations.

Applications

• Slitting machines
• Flexographic printing machines
• Rotogravure printing machines
• Laminating machines
• Coating machines
• Packaging machinery
• Film converting equipment
• Lithium battery production lines
• Textile winding systems
• Paper processing machinery

Available Sizes (product variants)

• 28
• 35
• 50
• 75

Technical Specifications (table)
Item: Specification
Product Type: STO/STW / FLO/FLW Safety Chuck
Torque Capacity: Up to 400Nm
Material: Alloy Steel / Aluminum
Mounting Type: Foot Mounted / Flange Mounted
Shaft Compatibility: Air Expanding Shafts
Hole Type: Square / Custom
Application: Winding & Unwinding Systems
Surface Treatment: Hardened / Anti-corrosion
Customization: Available

Why choose XW Machinery safety chucks

• Smooth torque transmission
• Reduced machine vibration
• Faster roll replacement
• Long-term durability
• Stable operation under heavy loads

Caractéristiques / spécifications techniques

• Product Type: STO/STW / FLO/FLW Safety Chuck
• Torque Capacity: Up to 400Nm
• Material: Alloy Steel or Aluminum options
• Mounting: Foot-mounted (STO/STW) or Flange-mounted (FLO/FLW)
• Shaft Compatibility: Designed for air expanding (pneumatic) shafts
• Hole Type: Square (custom sizes available)
• Application: Industrial winding and unwinding systems
• Surface Treatment: Hardened and anti-corrosion finishes
• Customization: Special shaft dimensions, torque requirements, non-standard square holes, aluminium lightweight structures, and surface coatings available