M39 Double Stack Self-Locking Anti-Loosening Washers Belleville Washers Lock-washers - Vibration-Resistant Locking Fasteners for Automotive, Industrial Machinery, Construction Equipment & Maintenance

M39 Double Stack Self-Locking Anti-Loosening Washers Belleville Washers Lock-washers - Vibration-Resistant Locking Fasteners for Automotive, Industrial Machinery, Construction Equipment & Maintenance

• Engineered with a double-layer self-locking design to create irreversible friction, ensuring bolts stay securely tightened even under extreme vibration, heavy loads, or thermal expansion.
• Choose between corrosion-resistant stainless steel for harsh outdoor/chemical conditions or Dacromet-coated 65Mn steel for superior rustproofing and 500% longer fatigue life compared to standard washers.
• Covers 98% of industrial fastener needs, from small precision equipment (M3) to heavy-duty construction machinery (M56), eliminating the hassle of sourcing multiple washer types.
• Conical shape enhances elastic preload distribution, absorbing shocks and compensating for material relaxation to maintain tension 3x longer than flat washers.
• DIN25201 standards, trusted for automotive drivetrains, CNC machine bases, bridge bolt connections, and high-speed rail track fastening systems.