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Crusher plate bolts must be manufactured from high-tensile alloy steel, typically grades 8.8, 10.9, or 12.9, to withstand extreme vibration and shear stress. For heavy-duty mining applications, look for 40Cr or 42CrMo steel which offers superior fatigue resistance. Ensure the bolts undergo quenching and tempering (Q&T) heat treatment to achieve a hardness level of HRC 33-39 (for 10.9 grade), balancing toughness with brittleness prevention.
Since crusher bolts are often brand-specific (e.g., for Metso, Sandvik, or Terex), you must verify the head type (oval, square, or countersunk) and thread pitch. Request technical drawings in PDF or CAD format from the supplier to confirm the shank length and thread length match your equipment's liner thickness. A mismatch of even 1-2mm can lead to loose plates and catastrophic machine failure.
To prevent rust during storage and facilitate easier removal during maintenance, bolts should be treated with Black Oxide, Zinc Plating, or Dacromet coating. Dacromet is highly recommended for mining environments as it provides excellent salt spray resistance and prevents hydrogen embrittlement, which is a common risk in high-strength fasteners.
Suppliers should strictly adhere to international standards such as DIN 603, ISO 898-1, or ASTM A193. You should demand a Material Test Report (MTR) and a Certificate of Conformity (CoC) for every batch. For wholesale orders, ensure the manufacturer is ISO 9001:2015 certified to guarantee process consistency.
Always request a third-party inspection (such as SGS or Intertek) before the final payment. The inspector should perform a Random Hardness Test and a Spectrometer Analysis to verify the chemical composition of the steel. Avoid suppliers who refuse to provide heat number traceability for their raw materials.
Focus on the raw material index (steel prices). Negotiate a formula-based pricing model if you are signing a long-term contract. For bulk orders on Made-in-China.com, you can often achieve a 10-15% discount by increasing the MOQ to a full 20ft container load, which also optimizes sea freight costs per unit.
Crusher bolts are extremely heavy and can damage standard packaging. Insist on double-layered woven bags inside reinforced wooden crates (IPPC heat-treated). Each crate should not exceed 1,000kg to 1,500kg to ensure safe handling by forklifts at port terminals and to prevent box bursting during transit.
Verify the HS Code (typically 731815) for your specific country, as many regions (like the EU or USA) may impose anti-dumping duties on certain Chinese steel fasteners. Work with a freight forwarder experienced in DDP (Delivered Duty Paid) or CIF (Cost, Insurance, and Freight) terms to ensure all tariffs are calculated accurately before the goods leave the port.
