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DIN 914 refers to hexagon socket set screws with a cone point. When sourcing, you must specify the material grade, such as Stainless Steel (A2-70/A4-80) for corrosion resistance or Alloy Steel (12.9 grade) for high-tensile applications. Ensure the thread tolerance meets 6g standards to guarantee smooth assembly with female threads. Additionally, verify the surface treatment, such as black oxidation, zinc plating, or passivation, to match your specific environmental requirements.
The cone point is specifically designed for permanent or semi-permanent location of parts on shafts. The sharp point penetrates the surface of the shaft, providing high torsional and axial holding power. It is ideal for applications where the screw is intended to pivot or lock into a prepared pit or countersink, making it a staple in mechanical engineering, automotive assemblies, and precision instrument manufacturing.
Beyond the DIN 914 dimensional standard, buyers should ensure the products comply with RoHS and REACH directives to avoid hazardous substances. For critical industrial use, request ISO 9001 certification from the manufacturer and a 3.1 Material Certificate to trace the chemical composition. If the screws are used in the EU or US markets, check for CE marking or alignment with ASTM/ASME equivalents if cross-standard compatibility is required.
Request a Hardness Test Report (Vickers or Rockwell) to ensure the screw won't deform under high torque. For alloy steel 12.9 grade, decarburization testing is vital to prevent brittle failure. You should also ask for a Salt Spray Test report (e.g., 48h, 72h, or 96h) if the screws will be exposed to moisture, ensuring the anti-rust performance meets your project's lifespan expectations.
Always utilize Third-Party Inspection (TPI) services like SGS or Intertek before the final balance payment. For fasteners like DIN 914, dimensional accuracy is often the biggest issue; ensure the inspector uses calibrated go/no-go gauges. When sourcing via Made-in-China.com, prioritize Audited Suppliers who have undergone on-site factory verification to ensure they have the actual production capacity and QC equipment.
Fasteners are high-volume, low-margin goods. To get the best price, consolidate your sizes to reach a higher total weight, as shipping costs per kg drop significantly with volume. Negotiate based on raw material indices (like steel market prices); professional suppliers are often willing to offer a 5-10% discount for long-term contracts or off-season orders. For custom lengths, expect a higher Minimum Order Quantity (MOQ), usually starting at 10,000 to 50,000 pieces depending on the diameter.
Set screws are dense and heavy. Ensure the supplier uses reinforced double-wall corrugated cartons and plastic inner bags to prevent moisture/rust during sea transit. For bulk orders, specify fumigated wooden pallets with secure plastic wrapping to prevent shifting. For international trade, FOB (Free On Board) is generally recommended for experienced buyers to maintain control over freight costs, while DDP (Delivered Duty Paid) is better for those wanting a hassle-free door-to-door experience.
Use secure payment methods provided by reputable platforms like Made-in-China.com, which offer escrow-like services to protect your funds until shipping documents are verified. Avoid direct wire transfers to private accounts. Always sign a Sales Confirmation (SC) that clearly outlines the technical specifications, lead times, and dispute resolution protocols under international trade law (Incoterms 2020).
