DIN 940 / GB 900 / UNI 5917 Studs with Extra Long Tap End (≈ 2.5d)

1. Powertrain & Engine Manufacturing

• Typical Application: Engine Block & Cylinder Head Assembly
• Recommended Specs: M10 * 60 / M12 * 80 | Grade 10.9 | Zinc-Nickel Plated
• Technical Insight: DIN 940 studs feature an extra-long tap end (≈ 2.5d) specifically designed for aluminum engine blocks. In low-strength base materials, deeper thread engagement effectively distributes axial tension, preventing thread stripping or base material damage during high-torque tightening. The Zinc-Nickel coating provides exceptional thermal and chemical resistance.

2. Fluid Engineering & Heavy Hydraulics

• Typical Application: Cast Iron Pump Casing Fastening
• Recommended Specs: M16 * 70 / M24 * 110 | Grade 8.8 | Phosphated & Oiled
• Technical Insight: In grey or ductile iron pump and valve housings, standard studs are prone to thread fatigue due to constant operational vibration. DIN 940 enhances fatigue strength by increasing the engagement depth. The phosphated and oiled finish ensures a stable torque-to-tension transition during assembly while providing essential rust protection.

3. Railway & Chassis Systems

• Typical Application: Gearbox Housing Connections
• Recommended Specs: M12 * 50 / M16 * 80 | Grade 10.9 | Zinc-Flake (Geomet/Dacromet)
• Technical Insight: Railway equipment faces extreme alternating loads. Grade 10.9 high-tensile DIN 940 studs combined with Zinc-Flake coating offer superior corrosion resistance while completely eliminating the risk of Hydrogen Embrittlement common in high-strength steel, ensuring the absolute safety of chassis components.

4. Light Alloy Structures & Marine Support

• Typical Application: Magnesium-Aluminum Frame Assembly
• Recommended Specs: M6 * 30 / M8 * 40 | Stainless Steel A4-80 (SS316) | Passivated
• Technical Insight: In marine or high-humidity environments, galvanic corrosion is a major risk for light alloy structures. Using A4-80 (SS316) stainless steel DIN 940 studs with strict passivation ensures both load-bearing capacity (via 2.5d engagement) and long-term resistance to pitting and electrochemical corrosion.

Standard Packaging

Inner Packaging

• Small boxes (EternalFast branded or neutral white/blue) with clear technical labeling.
• Heavy-duty moisture-proof plastic bags for bulk orders (25kg per bag).

Outer Packaging

• Standard Export Cartons (approx. 36×24×16 cm).
• Net Weight: 25kg per carton.
• Gross Weight: ~25.5kg.

Palletization & Protection

Fumigation-free Pallets: Standard 800×1200 mm or 1000×1000 mm pallets to ensure smooth customs clearance.

Safety Reinforcement: All pallets are wrapped in Stretch Film and reinforced with Plastic/Steel Strapping

Corner Protectors: Used to prevent carton crushing during long-distance maritime transit.

• Certificates Fully compliant with ISO 9001:2015 , CE Certification , and RoHS & REACH environmental standards.
• Inspection:  100% Visual Inspection: Ensuring perfect surface finish and thread integrity. Mechanical Testing: Random sampling for Tensile Strength, Hardness (HV/HRC), and Salt Spray Testing (SST).
• Full Traceability: MTC 3.1 provided with every batch, traceable to the raw material heat number.