CNC Pie Ring Jaws

About CNC Pie Ring Jaws

CNC pie ring jaws (or pie jaws) are specialized, arc-shaped soft jaws designed for CNC lathe chucks to provide full-circumferential contact, ideal for holding thin-walled, delicate, or large-diameter workpieces with minimal distortion. Made from aluminum or mild steel, they distribute clamping force evenly to enhance precision. 

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• Shape & Contact: Unlike standard top jaws, these are circular segments (pie-shaped) that cover a large portion of the circumference, allowing for superior gripping of thin-walled pipes or rings without crushing them.
• Material: Usually made of S45C (mild steel) or aluminum, allowing them to be easily machined to fit specific part diameters.
• Application: Commonly used in industries requiring high-precision finishing of large diameter parts.
• Serration: Typically feature a standard 
  
   serration pitch to match industrial chucks (e.g., Kitagawa).
• Customization: They are often sold as blanks and require boring to the exact workpiece diameter. 
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• Reduces Deformation: Provides full surface support, preventing the "triangular" distortion common with 3-jaw chucks on thin parts.
• Increased Accuracy: Ensures consistent clamping pressure across the surface.
• Versatility: Can be used for internal (ID) or external (OD) clamping. 
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