Why Mold Draft Angle Design Matters in Injection Molding

One of the most critical but often ignored elements in mold design is the draft angle—a slight taper applied to vertical surfaces of a molded part to ensure easy ejection.

At Dongxinda, we carefully calculate the ideal draft angle for each part, based on material type, wall thickness, and mold texture.

What happens without a draft angle?

• Parts stick to the mold core

• Ejector pins leave marks or damage

• Increased cycle time and risk of mold damage

By applying proper draft angles, our molds ensure:

• Smooth ejection without distortion

• Lower wear on tooling components

• Cleaner part surfaces and shorter cycles

FAQs:

• What’s the standard draft angle used?
  Usually 1° to 2°, but it varies based on material and surface texture.

• Can draft be added to existing designs?
  Yes, we help customers revise CAD models during DFM review.

• Does adding draft affect part fit or function?
  Slightly—but we design it to maintain full functionality and appearance.