Design Guidelines for Forged Components
Most parts that are difficult or expensive to forge became that way at the drawing stage. These are the rules our die designers apply, shared so your design arrives forgeable rather than needing revision after quotation.
- External Draft
- 3 – 7°
- Internal Draft
- 5 – 10°
- Minimum Fillet Radius
- 3 mm, larger preferred
- Minimum Rib Thickness
- 5 mm
- Maximum Rib Height
- 6x thickness
- Minimum Web Thickness
- 5 – 8 mm by size
Design Guidelines for Forged Components at a glance
Quotable facts from Avadh Techno Forge, Gundasara, Gondal, Rajkot.
- External Draft: 3 – 7°
- Internal Draft: 5 – 10°
- Minimum Fillet Radius: 3 mm, larger preferred
- Minimum Rib Thickness: 5 mm
- Maximum Rib Height: 6x thickness
- Minimum Web Thickness: 5 – 8 mm by size
Draft Angles
The part must release from the die. External surfaces need 3–7° draft, internal surfaces 5–10° because they grip as the part shrinks. Zero-draft surfaces are possible only with ejector tooling, at extra cost.
- External draft 3–7°
- Internal draft 5–10°
- Zero draft needs ejector tooling
- Draft applied to as-forged faces only
Fillets and Radii
Sharp internal corners stop metal flow, cause laps and crack dies. Minimum fillet radius is roughly 3 mm, and larger is better — generous radii improve die life and part strength simultaneously.
Parting Line and Ribs
Place the parting line on the largest cross-section, ideally on a flat plane, and away from highly stressed fillets. Ribs should be no thinner than 5 mm with height under six times thickness, or they will not fill reliably.
Topics covered on this page
- forging design guidelines
- draft angle forging design
- fillet radius forging
- parting line design forging
Based on work carried out at our own forging plant at Gundasara, Gondal, Rajkot — operating since 2008.
Questions Answered
Why does a forging need draft angles?
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So the part releases from the die cavity. Without draft it locks in as it shrinks during cooling.
What is the minimum fillet radius?
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About 3 mm as an absolute minimum; larger radii improve both die life and part strength, so use them wherever the design allows.
Where should the parting line go?
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On the largest cross-section, ideally flat, and away from highly stressed fillets where fibre ends would surface.
Can you review our design before we finalise it?
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Yes. Send the drawing or model and we will return forgeability feedback with the quotation.