Specializing in complex fastener challenges. With 15 years of cold forging and CNC expertise, we transform your engineering drawings into high-precision reality. Whether it's unique head shapes, special threads, or exotic materials, EternalFast delivers reliability.
- Extreme Scale & Heavy-Duty: Specializing in large-diameter Heavy-Duty Bolts (up to 3 1/2” / M90+) and Extra-Long Studs (up to 1000mm+) for infrastructure and heavy machinery.
- OEM/ODM, Technical Consulting, Prototype to Mass Production
- Manufacturing Process: Integrated Multi-station Cold Forging for high-volume grain structure alignment, followed by CNC Secondary Machining for complex geometries (e.g., cross-drilled holes, eccentric heads).Shoulder & Shank Precision: Tolerance control up to g6/h7 for shoulder diameters to ensure perfect fit in rotational or sliding applications.
- Concentricity: Stringent control of head-to-shank and thread-to-shank concentricity within 0.05mm TIR (Total Indicator Reading).
- Under-head Fillet: Optimized radius design to reduce stress concentration, enhancing fatigue resistance under high-vibration environments.
- Thread Run-out: Precision-ground thread rolling dies to ensure minimal run-out and smooth engagement for automated assembly.