How Draft Angle Affects Die-Cast Part Ejection & Finish

In high-pressure die casting, draft angle is a small design feature that makes a huge difference. It’s the slight taper applied to walls or ribs to help the part release smoothly from the die.

🔍 Why draft angle matters:

Without sufficient draft, parts stick to the die. This causes: 

• ⚠️ Higher ejection force 

• ⚠️ Risk of part distortion or damage 

• ⚠️ Excessive die wear 

• ⚠️ Surface scuffing or scratches

  
  

  With well-planned draft: 

• ✅ Clean ejection 

• ✅ Better surface finish 

• ✅ Longer die life 

• ✅ Reduced cycle time

  
  

📏 Typical draft guidelines:

• External walls: 1°–2°

• Internal walls (harder to release): 2°–3°

• Features with deep pockets or ribs: Even more draft needed

  
  

👨‍🏭 LVIO’s value-add:

At LVIO Precision, we review draft angles during DFM (Design for Manufacture) stage to help customers avoid costly tooling revisions or defects later.

When we evaluate the casting and perform CNC machining, we ensure that draft design supports both casting integrity and ease of secondary machining — reducing scrap, rework, and cost.