Design and Engineering Handbook
Part Design
Tool Design
Failure Analysis
Secondary Operations
Printable Brochure
Part Design: Radius Design



The curve gives an indication of the proper radius to be used for a given
wall thickness. (Courtesy - S.P.J. Plastics Engineering Handbook.)

Critical Constraints

  • Minimum suggested radii should be ¼ normal wall thickness
  • Suggested radii: ½ to ¾ nominal wall thickness

Notes:

  • Minimum suggested radii should be ½ nominal wall thickness when using notch sensitive materials.
  • Larger radii distributes stress uniformly.