Why Cold Heading Is Cheaper Than CNC: Fastener Manufacturing Cost Analysis

The same M8×30 bolt might cost 0.1 RMB by cold heading but 1+ RMB by CNC turning. Why the 10× difference? It's all in the process.

What Is Cold Heading?

Cold heading forms bolt heads at room temperature using a high-speed press. Wire is fed from a spool, cut, upset, and formed in a few milliseconds on a multi-station machine. Threads are then rolled in a separate operation.

Advantages:

• 99% material utilization: Almost no scrap. CNC turning removes 50–70% of material as chips
• Extremely fast: Multi-station cold headers produce 100–300 bolts per minute
• Higher strength: Cold forming preserves continuous grain flow — tensile and fatigue strength are 20–30% higher than machined bolts
• Good surface finish: No secondary finishing needed

When CNC Turning Wins

• Small batches: Cold heading requires tooling (several thousand RMB). For 100 pieces, tooling isn't justified
• Large sizes: M30+ cold headers are very expensive machines — many shops don't have them
• Complex geometry: Special flanges, locating grooves, internal features that cold heading can't form
• Difficult alloys: Titanium and Inconel wear cold heading dies rapidly

Cost Comparison (M8×30 Class 10.9)

• Cold headed + rolled thread, 10k+ pcs: ~0.1–0.3 RMB/pc
• CNC turned, 100 pcs: ~1–3 RMB/pc
• CNC turned + rolled thread, 100 pcs: ~2–5 RMB/pc

Recommendation

1. Prototyping (a few dozen pieces) → CNC

2. Annual volume under 5000 special parts → CNC

3. Complex head geometry → CNC

4. Once design is validated and production scales → switch to cold heading for cost reduction

Toprecision provides CNC prototype fasteners and transitions them to cold-headed production for volume orders.