Frequency Asked Questions

FAQs

I. Common Questions Before Procurement

You can refer to the standard specifications provided by the vehicle manufacturer or consult the vehicle maintenance manual. If unsure, provide specific usage scenarios, load requirements, and material needs, and suppliers can recommend suitable specifications.

Automotive fasteners typically adhere to the following international standards:

  1. ISO(International standards, such as ISO 898-1 for bolt strength grades)
  2. GB(Chinese National Standards, such as GB/T 3098.1 for bolt mechanical properties)
  3. DIN(German standards, such as DIN 933 for hexagon head bolts)
  4. JIS(Japanese standards, such as JIS B 1180)
  5. ANSI/SAE(American standards, such as SAE J429 for bolt grades)

Common materials for automotive fasteners include:

  1. Carbon Steel (general use, cost-effective)
  2. Alloy Steel (high strength, such as 10.9 and 12.9 grade bolts)
  3. Stainless Steel (corrosion-resistant, but lower strength than high-strength steels)
  4. Titanium Alloy (lightweight, high-temperature resistance, higher cost)
  5. Coated Fasteners (such as zinc or nickel plating, to improve corrosion resistance)

Tip: Choose materials based on the operating environment (high temperature, humidity, corrosion, etc.).

  1. Choose certified products that meet industry standards (ISO, IATF 16949).
  2. Request material certifications and mechanical performance test reports from suppliers.
  3. Inspect the appearance for cracks, burrs, or rust.
  4. Request sample testing, including tensile, torque, and salt spray tests.

Electric vehicles require more advanced fasteners:

  1. Lightweight (using materials like aluminum alloy or titanium alloy).
  2. Highly corrosion-resistant (due to the unique environment of electric vehicle batteries).
  3. Higher strength (due to high-speed motors and drive systems demanding better mechanical performance).

FAQs

II. Supplier-Related Questions

Certifications (such as ISO 9001, IATF 16949).

Customer Reputation (check customer reviews and whether they supply to renowned automotive manufacturers).

Quality Assurance (do they provide quality control reports, material testing).

Supply Capacity (delivery times, inventory levels).

After-sales Service (return/exchange policies, technical support).

Price discrepancies can be due to:

  1. Different materials (high-strength alloys vs. regular carbon steel).
  2. Different manufacturing processes (cold heading vs. turning vs. hot forging).
  3. Different surface treatments (galvanizing, phosphating, electroplating).
  4. Brand premium (well-known brands may charge higher prices).
  5. Bulk purchasing (larger orders may receive better pricing).
  • Standard items (in stock): Generally shipped within 3-7 days.
  • Custom items: Depending on production, 15-45 days.
  • Large orders: Typically require 30-60 days for stock preparation.

Yes, but customization requires:

  1. Providing detailed drawings.
  2. Specifying material, size, and surface treatment requirements.
  3. Confirming the minimum order quantity (MOQ), as custom items often have higher MOQs.

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FAQs

III. Order and Logistics-Related Questions

  1. Request sample testing.
  2. Sign a procurement contract that specifies quality standards.
  3. Choose suppliers with a quality management system (ISO 9001/IATF 16949).
  4. Visit the factory to inspect production processes and quality control systems.
  1. Small packaging (e.g., 100 pieces per bag, suitable for retail or repairs).
  2. Carton packaging (suitable for bulk shipping).
  3. Pallet packaging (for large-volume export, to prevent shipping damage).
  4. Rustproof packaging (for long-term storage to prevent oxidation).

Tip: For bulk orders, request rustproof packaging to ensure long-term storage without deterioration.

  1. Bulk purchasing (larger orders often offer better pricing).
  2. Long-term partnerships (signing long-term supply agreements can lead to better pricing).
  3. Material selection (opt for cost-effective materials, such as 10.9 grade instead of 12.9 grade).
  4. Optimize logistics (combine orders to reduce transportation costs).

FAQs

IV. Quality and After-sales Questions

  1. Carbon Steel (no coating): 1-2 years (prone to rust).
  2. Galvanized: 3-5 years (depending on environment).
  3. Stainless Steel: 5-10 years (corrosion-resistant).
  4. Titanium Alloy: Over 10 years (high durability).

Tip: Store in dry environments and consider rust-proof coatings to extend lifespan.

  1. Confirm responsibility with the logistics company.
  2. Check if the supplier offers damage compensation.
  3. Clearly state damage liability in the contract to ensure compensation options.

Immediately take photos as evidence.

Contact the supplier with the order number and problem description.

Review the contract to confirm return/exchange policies.

If purchasing in bulk, consider signing a quality agreement to mitigate risks.

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