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External Serrated Lock Washers are a type of mechanical standard component that provides anti-loosening functionality through a serrated structure. Their unique design and reliable performance make them widely used in various industrial connection scenarios.
Structural Design
The washer features radial external serrations along its outer diameter edge, typically with 16 to 32 teeth. The tooth angle ranges from 60° to 90°, and the tooth height is approximately 0.3 to 1.5mm. The tooth tips face outward, and during installation, they embed into the surface of the connected component to form a secure mechanical interlock.
Anti-Loosening Mechanism
Friction Enhancement: The micro-interlocking between the serrations and the contact surface significantly increases the friction coefficient, effectively resisting loosening caused by vibration and torque.
Elastic Compensation: The elastic deformation of the washer can absorb dynamic loads, maintaining stable clamping force even under fluctuating working conditions.
Stress Dispersion: The serrated structure distributes concentrated stress evenly across the connection surface, reducing the risk of fatigue failure in critical components.
Common Materials
Carbon Steel: Offers low cost and high strength, suitable for general industrial environments. Often quenched to enhance hardness (HRC 36-43).
Stainless Steel (304/316): Exhibits excellent corrosion resistance, ideal for humid, chemical, or marine environments (e.g., no rusting after 5,000 hours of salt spray testing).
Brass: Possesses good electrical conductivity, used in electrical equipment to prevent sparking.
Spring Steel (e.g., 65Mn): Delivers high elasticity, suitable for long-term vibration scenarios.
Surface Treatments
Zinc Plating (Blue/White/Yellow): Provides basic corrosion protection, with salt spray resistance exceeding 200 hours.
Phosphating: Enhances friction coefficient, suitable for mechanical connections requiring high torque.
Black Oxide/Passivation: Improves appearance consistency; passivation of stainless steel maintains surface luster.
Dacromet: An environmentally friendly coating with salt spray resistance over 1,000 hours, used in high-end industrial applications.
International Standards
DIN 6798 (Type A/V): European standard, available in flat (Type A) and countersunk (Type V) versions to match different bolt head designs.
ASME B18.21.1: American standard, specifying dimensions, materials, and testing methods.
ISO 7040: Internationally recognized standard, covering metric sizes (M3-M24).
Imperial: #4-1", compatible with various thread specifications.
Performance Parameters
Hardness: Carbon steel versions have a hardness of HV 350-425; stainless steel versions have a hardness of HV 200-300.
Anti-Loosening Effect: Anti-loosening capability is 3 times higher than that of ordinary washers in vibrating environments; tooth tips can embed approximately 0.3mm into metal surfaces.
Application Fields
Industrial Equipment: Mechanical connections with frequent vibration, such as motors, pumps, and gearboxes.
Automotive Manufacturing: Engine components, chassis connections, and body assembly.
Construction and Infrastructure: Steel structures for bridges, wind turbine towers, and building curtain walls.
Home Appliances and Piping: Sealed connections for washing machines, faucets, and gas pipelines.
Aerospace: Precision instruments and aircraft components, using special alloy materials to ensure reliability.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter,Seller
Year Established:
2019
Total Annual:
2000000-5000000
Employee Number:
50~100
Ecer Certification：
Verified Supplier
Shaanxi Flourish Industrial Co., Ltd specializes in manufacturing and supplying various fasteners & some pipe fittings. Bolts, nuts, washers, screws, plugs, couplings,end dishes, gaskets and flanges round out our most popular categories, while our extensive collection of standoffs, pins and rive... Shaanxi Flourish Industrial Co., Ltd specializes in manufacturing and supplying various fasteners & some pipe fittings. Bolts, nuts, washers, screws, plugs, couplings,end dishes, gaskets and flanges round out our most popular categories, while our extensive collection of standoffs, pins and rive...
