Metal casting fence spearhead

Buyers should prioritize Cast Iron (Grey or Ductile) or Cast Aluminum depending on the environment. For high-security and durability, Ductile Iron is preferred due to its higher impact resistance. Ensure the material composition meets ASTM A48 standards for cast iron to prevent premature cracking or brittleness under mechanical stress.

To ensure a service life of over 10 years, the spearheads must undergo Hot-Dip Galvanizing (HDG) or Electro-galvanizing followed by Powder Coating. A high-quality Polyester Powder Coating with a thickness of at least 60-80 microns is essential to resist UV radiation and salt spray corrosion, especially in coastal regions.

It is vital to confirm the Internal Diameter (ID) or Base Socket Size of the spearhead. Most standard pickets are 12mm, 16mm, or 20mm square/round bars. Request a technical drawing (CAD/PDF) from the supplier to verify the weldability and fitment tolerances, ensuring the base matches your specific fence rail dimensions.

Insist on a Visual Inspection for casting defects such as sand holes, burrs, or cold shuts, which can weaken the structure. A Dimensional Consistency Test should be performed to ensure a variance of less than ±0.5mm, which is critical for automated welding processes on assembly lines.

The most significant risks include material substitution (using scrap metal instead of virgin ingots) and weight discrepancies. Always specify the net weight per piece in the contract. Use Made-in-China.com's Secured Trading services to ensure that payment is only released after a Third-Party Inspection (such as SGS or BV) confirms the material grade and quantity.

For custom designs, there is usually a Molding Fee (Tooling Cost). Negotiate for a refund of the mold fee once the cumulative order volume reaches a certain threshold (e.g., 5,000 units). For standard designs, aim for a 10-15% discount on volumes exceeding a full 20ft container load, as casting production is highly sensitive to economies of scale.

Spearheads are heavy and dense; they should be packed in reinforced double-wall corrugated cartons and secured on fumigated heat-treated pallets. To prevent moisture damage during sea transit, insist on the use of VCI (Volatile Corrosion Inhibitor) bags or silica gel desiccant packs inside the waterproof inner lining of the crates.

Check for Anti-Dumping Duties (ADD) on iron and steel components in your specific country (e.g., US Section 301 or EU steel safeguards). Ensure the supplier provides a Certificate of Origin (CO) and the correct HS Code (typically 7325.99 or 8302.41) to avoid customs delays and ensure accurate tariff application.