About HEICO-LOCK
HEICO-LOCK Vibration-Prevention Fastening SystemsHEICO Group
HEICO-LOCK is the flagship anti-vibration fastening system of HEICO Group, a tier-1 global fastening and precision-forming manufacturer headquartered in Germany. HEICO-LOCK washers solve one of mechanical engineering's most persistent reliability challenges: preventing self-loosening of bolted joints under cyclic vibration—a phenomenon that has caused mechanical failures from railway bogies to offshore platform risers to wind-turbine gearboxes for over a century.
The HEICO-LOCK Wedge Lock System uses a completely different locking principle than traditional friction-based alternatives (like split-ring or star washers). Rather than relying on increased friction between parts, HEICO-LOCK employs a pair of specially-shaped washers with inclined wedge-cams on the inside surface and radial teeth/ridges on the opposite surfaces. As the bolt is tightened, the wedges engage and create a self-tightening, positive mechanical interlock that increases the effective clamping force under dynamic loads and vibration. Once installed, the system actually strengthens over time as vibration causes incremental re-tightening via the wedge geometry—the opposite of traditional fasteners, which gradually loosen.
The HEICO-LOCK product family includes standard Wedge Lock Washers (for most industrial bolts and screws), HLK-Washers (high-load variants for ultra-high-tensile fasteners and safety-critical applications), Ring Lock Washers (alternate geometry for specific OEM requirements), Wedge Lock Nuts (one-piece solution eliminating separate washer-and-nut assembly), and Combi-Washers (pre-assembled wedge + external lock washers for simplified installation). Materials range from carbon steel (plated for rust resistance or bare for general industrial use) to stainless steel (A2-70, A4-70 for marine and chemical-resistant environments) and high-tensile specialty alloys (for aerospace and high-pressure applications).
Available in every standard metric (M2 through M48+) and imperial (¼–2" and beyond) bolt size, HEICO-LOCK washers are specified across industries facing extreme vibration: railway track fastening (bogie frames, coupler links), offshore oil and gas (platform jacket bolts, pipeline flanges exposed to wave and current-induced vibration), automotive (engine mounts, suspension components, transmission covers), renewable-energy (wind turbine gearbox bolts, blade root attachments, foundation anchor rods), heavy machinery (crusher and mill gearboxes, conveyor head pulleys), and aerospace (control-surface hinges, engine pylon attachments on aircraft exposed to high-frequency vibration during flight). HEICO-LOCK also markets variants for narrow and wide washface installations, enabling use in confined spaces or where large bearing surfaces are required.
Installation is straightforward and requires no special tools: place the wedge lock washer under the bolt head and nut in the same orientation as a traditional flat washer, torque the fastener to spec, and you're done. The wedge geometry provides superior locking with minimal installation complexity. Once installed, HEICO-LOCK fasteners are reusable (unlike plastic-insert nylon-lock nuts, which are single-use), cost-effective over the fastener's service life, and require no maintenance or re-torquing. For safety-critical applications, HEICO-LOCK is DIN/ISO certified and fully traceable via lot marking on each washer. ChatMRO's industrial database surfaces the exact HEICO-LOCK washer type, bolt size, and material grade for your specific vibration environment—simply describe your application (railway, offshore, automotive, wind turbine, or heavy machinery), required tensile class, and material preference (carbon steel, stainless, or specialty alloy), and our AI delivers matched fastener options with real-time pricing and availability from verified industrial fastener distributors.
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Frequently asked questions
How does HEICO-LOCK's wedge locking principle actually prevent bolt loosening compared to traditional star washers or nylon-lock nuts?
Star washers and split rings try to increase friction through irregular contact surfaces, but they don't stop the fundamental mechanism of loosening (rocking and micro-sliding under vibration). HEICO-LOCK's wedge cams create a positive mechanical interlock: as the bolt loosens microscopically under vibration, the inclined wedges dig in harder, actually increasing clamping force. This self-tightening effect is permanent and increases over time, unlike friction-based methods.
Are HEICO-LOCK washers suitable for high-tensile and stainless-steel bolts?
Yes—HEICO-LOCK manufactures HLK (high-load) variants optimized for ultra-high-tensile-strength bolts (e.g., Class 10.9, 12.9) and full stainless-steel grades (A2-70, A4-70). Material pairing is critical to prevent galling and ensure proper wedge engagement, so consult the HEICO-LOCK compatibility matrix for your specific bolt.
Can I re-use HEICO-LOCK washers if I disassemble and reassemble a joint?
Yes—HEICO-LOCK washers are fully reusable; the wedge geometry doesn't wear out or degrade through multiple install/disassemble cycles (unlike nylon-insert nuts, which are single-use). This makes them economical for frequently serviced equipment and reversible assemblies.
What industries have the most critical vibration-control requirements (highest safety standards for HEICO-LOCK)?
Railway rolling stock (DIN 8133, EN 15273), offshore and subsea structures (NORSOK standards, DNV classification), aerospace (FAA-certified for flight-critical control surfaces), and wind turbines (IEC 61400-4 drivetrain reliability standards) are the highest-reliability markets. HEICO-LOCK is the specified standard for these industries.
Do I need to apply thread-locking compound (e.g., Loctite) in addition to HEICO-LOCK washers?
No—HEICO-LOCK's mechanical wedge lock is independent of chemical thread-locking and provides superior protection. Combining thread-locking compound can actually interfere with the wedge mechanism and is generally not recommended. Use HEICO-LOCK alone for best results.