Jul 10, 2026

How Tonnage Affects Stamping Die Cost

Stamping die tonnage is a critical factor in die design and cost. Understanding the relationship between tonnage and price helps international buyers make informed sourcing decisions.

Tonnage Calculation Formula

Chinese factories typically calculate required press tonnage using this formula:

Tonnage (tons) = (Cutting Perimeter × Material Thickness × Shear Strength × Safety Factor) / 1000

Where:

• Cutting Perimeter: Total length of cut edges (mm)
• Material Thickness: Sheet metal thickness (mm)
• Shear Strength: Material-specific value (e.g., 340 N/mm² for mild steel, 420 for stainless steel)
• Safety Factor: Typically 1.2-1.5

Example: A 200mm × 150mm rectangular part in 1.5mm mild steel requires approximately: (700mm × 1.5mm × 340 × 1.3) / 1000 ≈ 46 tons. A 60-ton press would be specified.

Cost Impact by Tonnage Range

• Under 60 tons: $2,000-5,000. Simple blanking dies, small parts.
• 60-150 tons: $5,000-12,000. Medium-sized progressive dies, typical for automotive brackets and household appliance components.
• 150-300 tons: $12,000-25,000. Large progressive dies, auto structural parts.
• 300-500 tons: $25,000-50,000. Transfer dies, large panels.
• 500+ tons: $50,000-150,000+. Automotive body panel dies.

Cost Comparison by Die Type

For a given part size and tonnage, the die type has a significant cost impact:

• Simple blanking die: Base cost (1.0x)
• Compound die: 1.5-2.0x more expensive (combined operations)
• Progressive die (5-8 stations): 3-5x more expensive (coil-fed, multiple operations)
• Transfer die: 4-8x more expensive (individual stations, robotic transfer)

Sourcing Tips

When requesting stamping die quotes from Chinese factories:

• Provide the exact part material grade and thickness
• Specify the press tonnage available at your factory (ensures compatibility)
• Request a DFM (Design for Manufacturing) report addressing die construction type
• Ask about the expected die life (typically 1-5 million strokes for tungsten carbide dies)