Drill bits

Choosing the right material is critical for performance and tool life. For general-purpose metalworking, HSS (High-Speed Steel) is the standard. For high-heat applications or stainless steel, HSS-Cobalt (M35 or M42) is essential as it maintains hardness at higher temperatures. For high-volume production and extremely hard materials, Tungsten Carbide or Solid Carbide bits are preferred due to their superior wear resistance, though they are more brittle and require stable machinery.

Coatings significantly reduce friction and heat. TiN (Titanium Nitride) is a common gold-colored coating that increases surface hardness. TiAlN (Titanium Aluminum Nitride) is superior for high-speed machining and dry cutting because it forms a protective aluminum oxide layer under heat. For drilling non-ferrous metals like aluminum, Bright Finish (uncoated) or polished flutes are recommended to prevent chip welding.

Ensure the products adhere to international dimensional standards such as DIN 338 (Jobber length), DIN 340 (Long series), or ANSI B94.11M. For safety and quality management, prioritize suppliers with ISO 9001 certification. If sourcing for the European market, verify that the packaging and product meet relevant CE marking requirements where applicable, especially for masonry bits used with power tools.

The standard point angle is 118 degrees, which is suitable for most general tasks. However, for harder materials like stainless steel, a 135-degree split point is highly recommended because it is self-centering, reduces the 'walking' effect, and requires less thrust force to penetrate the material.

Material fraud is a common risk. Always request a Material Test Report (MTR) or a Mill Test Certificate to verify the chemical composition (e.g., Cobalt percentage). For large orders, it is wise to hire a third-party inspection agency like SGS or Intertek to perform a Hardness Test (Rockwell C scale) before the final shipment leaves the factory.

Focus on Tiered Pricing based on volume; for drill bits, a 1,000-unit order can often yield a 15-25% discount compared to sample prices. Negotiate for customized packaging (OEM) to include your brand logo, which adds value for resale. Always clarify the Incoterms (typically FOB or CIF) to ensure there are no hidden logistics costs.

Drill bits are heavy and prone to rust. Ensure the supplier uses VCI (Volatile Corrosion Inhibitor) paper or anti-rust oil coating. For bulk shipments, insist on plastic indexed cases or individual tubes packed into double-walled corrugated export cartons reinforced with palletization to prevent shifting and tip-over damage during sea freight.

To ensure payment security, use the Secured Trading Service provided by Made-in-China.com. Avoid paying the full amount upfront; a standard industry practice is a 30% deposit and 70% balance payment after the presentation of the Bill of Lading (B/L) and a successful pre-shipment inspection report.