Cold-Formed Special Parts

Cold-Formed Special Parts — Custom Cold Heading Manufacturing | Per Drawing

Cold-formed special parts are custom-engineered metal components manufactured by cold heading (cold forging) process. This high-speed, high-precision manufacturing method produces complex shapes with excellent material strength, superior surface finish, and minimal material waste. Ideal for high-volume production of custom fasteners and special-shaped metal parts.

Material & Specifications

Size Range	M3 to M24 / wire diameter 2mm to 24mm
Standard	Custom per customer drawing
Material	Carbon Steel, Alloy Steel, Stainless Steel, Brass, Aluminum, Copper
Process	Cold heading (1-die 2-blow to 5-die 6-blow machines)
Tolerance	±0.05mm (heading), ±0.02mm (machining), ±0.01mm (grinding)
MOQ	5,000 pcs (standard), 1,000 pcs (prototype with surcharge)

Surface Treatment & Zinc Coating Quality

At BoltNutsPlus, we understand that surface treatment is critical to fastener longevity and performance. Our products undergo rigorous coating processes to ensure maximum corrosion resistance and durability. We offer five premium coating options, each tested to international standards:

• Hot-Dip Galvanizing (HDG) — Thick zinc layer (50-120μm) providing superior long-term corrosion protection for outdoor, marine, and industrial environments. Compliant with ISO 1461 / ASTM A153 standards. Salt spray resistance: 500-1,000+ hours. Ideal for structural steel assemblies exposed to harsh weather.
• Electroplated Zinc Blue-White (Zn Blue/White) — Bright, clean silver-blue appearance with 5-15μm zinc layer. Cr3+ passivation technology, fully RoHS compliant. Ideal for indoor machinery, electronics, and general-purpose applications requiring aesthetic appeal and moderate corrosion resistance.
• Color Zinc / Yellow Zinc (Iridescent Passivation) — Multi-colored iridescent passivation film offering enhanced corrosion resistance (100-200 hours salt spray) with a distinctive golden finish. Widely preferred in automotive, agricultural equipment, and construction machinery sectors for its balanced protection and visual appeal.
• Dacromet Coating — Advanced water-based zinc-chromium coating technology with NO hydrogen embrittlement risk. Provides 1,000+ hours salt spray resistance, making it the preferred choice for high-strength fasteners in extreme environments. Environmentally friendly (no heavy metal discharge), RoHS/ELV compliant, ideal for automotive and wind energy applications.
• Multi-Element Alloy Co-Permeation — Zinc-aluminum-rare earth alloy layer offering 2-3x the corrosion resistance of traditional galvanizing. Features self-healing properties at scratch points, ensuring long-term protection even in damaged areas. Ideal for critical infrastructure, power transmission towers, coastal projects, and marine installations.

Key Features

• Cold heading process preserves material grain flow for superior strength
• High-speed production (100-400 pcs/min) for cost-effective volume manufacturing
• Minimal material waste compared to CNC machining (near-net-shape)
• Excellent surface finish suitable for plating without additional machining
• Multi-station progressive forming for complex part geometries
• Tooling design and manufacturing in-house for rapid prototyping

Applications

• Custom automotive fasteners and special-shaped parts
• Electronic and electrical connector components
• Hardware and furniture specialty fasteners
• Medical device components (stainless steel cold-formed parts)
• Consumer product custom metal components
• Any high-volume custom metal part suitable for cold heading

Why Choose BoltNutsPlus?

• ISO 9001:2015 Certified Manufacturing — consistent quality you can trust on every batch
• 15+ Years of Export Experience — serving 40+ countries across 6 continents
• Full Traceability — material certificates (EN 10204 3.1) and comprehensive test reports included
• Custom Packaging & OEM/ODM — your brand identity, your specifications, our precision manufacturing
• Third-Party SGS / Bureau Veritas Inspection Available upon request
• 24-Hour Quote Response — same-day reply for urgent requirements; standard 24-hour turnaround