Blank for coin

The choice of material directly impacts the striking quality and durability. Common materials include Brass (H62/H65), Zinc Alloy, Stainless Steel (304/316), and Copper. For high-end commemorative coins, ensure the material has a uniform density and a smooth surface finish (Ra < 0.8μm) to prevent pitting during the minting process. If you require plating, specify the base metal compatibility to ensure long-term adhesion.

For B2B buyers using automated striking machines, thickness tolerance should be within ±0.02mm and diameter tolerance within ±0.05mm. Weight consistency is critical for precious metal blanks; look for suppliers who guarantee a weight deviation of less than 1%. Requesting a caliper and micro-scale calibration report from the manufacturer is highly recommended before bulk production.

Blanks can be supplied as Polished (Mirror Finish), Brushed, or Plated (Gold, Silver, Nickel, Antique). Regarding edges, you can choose between Plain Edges, Reeded (Grained) Edges, or Lettered Edges. For challenge coins or medals, a diamond-cut edge adds significant perceived value. Ensure the supplier uses electroplating standards that pass a 24-hour salt spray test to prevent oxidation.

Ensure the products comply with RoHS (Restriction of Hazardous Substances) and REACH regulations, particularly regarding Lead (Pb) and Nickel (Ni) content, as these are strictly regulated in the US and EU for items handled frequently by hand. For blanks intended for toys or children's tokens, ASTM F963 compliance is mandatory.

Metal blanks are highly susceptible to moisture and oxidation. Insist on Vacuum Packaging with Silica Gel desiccant packets inside each inner box. The outer cartons should be double-walled corrugated fiberboard and secured on fumigated pallets to prevent shifting. For high-value orders, use VCI (Volatile Corrosion Inhibitor) paper wrapping.

Focus on Tiered Pricing based on weight rather than just unit count, as metal costs fluctuate. Ask for a Price Adjustment Clause linked to the London Metal Exchange (LME) index for large, long-term contracts. To verify reliability, prioritize Audited Suppliers on Made-in-China.com who have passed third-party inspections by SGS or Bureau Veritas.

Utilize Secured Payment services provided by the platform to hold funds until shipping documents are verified. Always arrange a Pre-shipment Inspection (PSI) to check for surface scratches and weight accuracy. A 5% - 10% random sampling according to AQL 2.5 standards is the industry benchmark for metal hardware components.

Correct classification is vital to avoid fines. Use HS Code 7326.90 (Other articles of iron/steel) or 7419.80 (Other articles of copper) depending on the material. Be aware that blanks resembling legal tender may be subject to strict anti-counterfeiting regulations and require specific declarations or 'Copy' marks to pass through customs in certain jurisdictions.