DIN 25201 Wedge Lock Washer
High-performance anti-loosening fastener engineered for extreme vibration and dynamic load conditions. Also known as double stack self-locking washer, the DIN 25201 wedge lock washer utilizes an advanced wedge tension locking mechanism — instead of conventional friction-dependent solutions. Once bolted joints tend to loosen, the unique wedge geometry generates strong jacking tension that restricts bolt rotation, delivering permanent secure fastening.
Must be used in pairs (matching wedge surfaces). Outer radial teeth provide biting grip, while inner inclined wedges transform rotational loosening into axial clamping force. Effectively replaces ordinary spring washers and nylon lock nuts, and allows repeated disassembly without performance loss.
Ideal for heavy machinery, mining equipment, railway, automotive chassis, and industrial assembly lines seeking zero maintenance and robust safety factor.
⚙️ Working Principle
Wedge-locking technology in pairs: When the bolt/nut is tightened, the radial teeth on outer sides embed into the clamped surfaces. Under vibration or impact load, the loosening tendency forces the two washers’ wedge surfaces to slide against each other. This generates a powerful axial expansion force that increases clamping pressure — effectively preventing any rotational loosening. Unlike split washers, this mechanical wedge system maintains tension even during severe shock loads.
✔️ Zero dependency on friction | ✔️ Maintains preload under dynamic stress | ✔️ Reusable with identical performance
Illustration: wedge lock washer pair in bolted joint — axial tension locks the assembly against vibrations.
✨ Product Advantages
Reliable Anti‑loosening Performance
Mechanical wedge tension instead of simple friction. Maintains stable fastening under continuous vibration, harsh environments, drastically reducing equipment failure and maintenance costs.
65Mn Spring Steel + Dacromet
High strength carbon steel with Dacromet coating — excellent salt spray resistance, high temp tolerance, no hydrogen embrittlement. Perfect for heavy-duty, corrosive scenarios: auto chassis, railway, mining tools.
304 & 316 Stainless Steel
Integrated anti-rust stainless steel, smooth finish, outstanding oxidation & corrosion resistance. Suited for food machinery, chemical plants, marine applications, sanitary assemblies.
DIN 25201 Strict Standard
Full compliance with DIN 25201 industrial standard, accurate dimension tolerance, uniform coating coverage over threads and gaps. No deformation, no cracks, stable for long-term mass assembly.
🧪 Diversified Surface Treatment & Material Options
High strength base material + professional Dacromet anti‑corrosion layer. Superior salt spray resistance, high temperature endurance, zero hydrogen embrittlement risk. Widely used in automotive chassis, railway infrastructure, construction machinery, and heavy-duty corrosion-resistant environments.
Integrated rust-proof stainless steel, smooth surface, exceptional oxidation & corrosion resistance. 316 grade offers extra marine-grade resistance. Suitable for food processing machinery, chemical equipment, outdoor engineering and sanitary-grade assembly.
✔️ Strict manufacturing process: precise dimension tolerance, every corner including thread gaps uniformly coated. No deformation, no crack — stable quality for high-volume usage.
📦 Practical Overseas Delivery Case
📍 Australia – Mining Transport Equipment Manufacturer
An Australian local engineering equipment manufacturer was suffering from frequent bolt loosening on mining transport gear. Traditional ordinary washers couldn’t resist intense vibration in mining sites, often causing abnormal shutdowns and delaying construction progress.
After technical communication and sample testing, the client selected our DIN25201 M10–M20 Dacromet coated wedge lock washers to replace original accessories. We completed bulk production and sea shipment within the agreed lead time. After field installation and operation, the bolt loosening problem was completely solved. The client greatly improved equipment uptime and reduced field maintenance costs significantly.
✅ Now steady repeat bulk orders — our wedge lock washers are listed as standard matching parts for all new mining equipment.
📦 Packaging & Service
- 📦 Standard export carton packaging, pallet loading available
- 🚚 Fast delivery for regular sizes, customized specifications accepted
- 🏷️ Support OEM logo marking & neutral export packing
- 🎁 Provide free samples for quality and performance test
- 🌍 All products meet international export environmental protection standards
🔗 Explore More Precision Fasteners
Direct Contact Channels
- One-stop service: design, customization, production, and global delivery
- OEM/ODM solutions for industrial and export-oriented buyers
