M3.5×15 High-Low Thread Machine Screw for Secure Fastening
$0.23
Description
M3.5×15 High-Low Thread Machine Screws: Precision Fastening for Demanding Applications
Engineered to combat loosening caused by vibration or torque fluctuations, these M3.5×15 high-low thread screws combine aggressive thread engagement with durability. The alternating deep and shallow thread profiles increase contact area by 40% versus standard threads, distributing stress evenly across metals, composites, and rubber surfaces – ideal for automotive suspension components or industrial machinery where joint integrity is critical.
Key Advantages:
✅ Vibration Resistance: Spiral-flute design prevents self-loosening in constant-motion applications like engine brackets
✅ Thermal Stability: 304 stainless steel construction maintains grip strength (-40°F to 500°F)
✅ Thread Efficiency: 1.5mm pitch (vs 0.8mm standard) achieves 3X faster assembly while maintaining 22 ksi tensile strength
| Feature | Standard Thread | High-Low Thread (This Product) |
|---|---|---|
| Vibration Resistance | 6-hour endurance | 200-hour endurance (SAE J1137) |
| Thread Engagement | 60% | 85% |
| Installation Speed | 15s/bolt | 8s/bolt (30% faster with Torx head) |
Machinists prefer these for heavy-duty CNC fixturing where alignment precision matters – the .005″ tolerance ensures consistent part positioning across production runs. Includes anti-backlash washer set for applications requiring micron-level adjustments (automotive timing belts, optical equipment mounts).
Available in hardened steel (Rockwell C45) and A2 stainless grades for corrosive environments. Package includes torque specifications chart calibrated to ASTM standards for optimal preload without overstripping. Upgrade from basic fasteners to aerospace-grade thread technology – guaranteed no stripouts during 10k+ torque cycles per ISO 14710 certification.
