Dth drill bit

When selecting a DTH drill bit, you must prioritize tungsten carbide grade and face design. For hard, abrasive rock, choose spherical buttons for durability; for soft to medium rock, ballistic buttons offer faster penetration. Ensure the shank type (e.g., DHD, SD, QL, Mission) is 100% compatible with your existing hammer to prevent energy loss. Additionally, verify the head diameter tolerance is within +2mm/-0mm to ensure the casing can follow smoothly.

Request documentation on the heat treatment process used for the alloy steel body, as this determines resistance to fatigue and body wash. High-quality bits should use premium YK05 or T6 tungsten carbide inserts. Ask for field test reports or drilling meters per bit data. A reputable supplier on Made-in-China.com should provide a hardness test report (HRC 42-48 for the body) and ultrasonic flaw detection results for the carbide inserts.

Suppliers should adhere to ISO 9001:2015 for quality management. For mining applications, check for compliance with local mining safety certifications. Ensure the steel used meets ASTM or DIN standards for high-impact tools. If the bits are used in environmental drilling, verify that the lubricants or anti-rust coatings used are non-toxic and compliant with regional environmental regulations.

Focus on the Cost Per Meter (CPM) rather than the initial purchase price. A bit that costs 20% more but lasts 50% longer is more economical. Negotiate tiered pricing for bulk orders (e.g., 50+ units) which can reduce unit costs by 15-25%. Additionally, consider purchasing regrinding tools from the same supplier to extend the life of the carbide buttons, further reducing long-term operational expenses.

The primary risk is material substitution, where lower-grade recycled carbide is used. Mitigate this by requesting Third-Party Inspection (SGS or Bureau Veritas) before shipment to verify material composition. Another risk is shipping damage to the precision-ground buttons; ensure the contract specifies heavy-duty wooden box packaging with individual plastic caps for each bit head.

DTH bits are high-density cargo. For large orders, Sea Freight (FOB or CIF) is most cost-effective, but ensure you account for a 30-45 day lead time. Negotiate a penalty clause for late delivery (e.g., 1% price reduction per week of delay). For urgent site needs, ask the supplier if they maintain safety stock of common shanks like DHD360 or SD6 for immediate air-freight dispatch.

Always use Secured Payment services provided by platforms like Made-in-China.com to ensure funds are only released upon proof of shipment. Avoid direct wire transfers to unknown accounts. Ensure the Proforma Invoice (PI) clearly states the exact shank model, button configuration, and warranty terms (e.g., replacement policy for premature carbide breakage) to provide legal recourse in case of disputes.