Design specificationsBeginner
Injection Draft Angle Guide
How much draft to specify on ribs, bosses, and textured walls for reliable ejection.
Mold DFM2024-11-199 min read5,8914.7
Summary
Insufficient draft causes scratching and ejection force spikes. Texture and depth increase required draft.
1Untextured walls
Minimum 1° on external walls; add 0.5° per 0.025 mm texture depth.
2Ribs and bosses
Draft ribs and bosses 0.5–1° more than adjacent walls.
3Deep cores
Long cores may need air ejection or split tools instead of zero draft.
Key points
- Baseline 1° external draft
- Increase draft with texture
- Draft ribs and bosses
Injection moldingDraftDFM
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