Products Detail

DASt 021 washers are high-precision hardened flat washers specially designed for heavy-duty industrial and large-scale structural fastening systems. Engineered for large-size bolt assembly matching, these industrial washers feature ultra-flat surface finish, uniform thickness distribution and excellent structural rigidity. Serving as critical auxiliary fastening components, they effectively disperse axial fastening pressure, reduce surface friction, prevent bolt loosening and substrate indentation, and stabilize bolt preload under long-term heavy load, mechanical vibration and alternating stress conditions. With superior compression resistance and structural stability, DASt 021 washers are ideal for large-spec heavy engineering connection scenarios that require high precision and high durability.
All DASt 021 washers adopt standardized precision forming and fine finishing processes, with smooth burr-free surfaces and tight dimensional tolerances. Professional heat treatment is applied to achieve stable hardness and balanced mechanical toughness, delivering outstanding wear resistance, deformation resistance and fatigue resistance. The standardized structural design ensures perfect coaxial fitting and excellent interchangeability with large-size standard bolt and nut assemblies, avoiding assembly deviation and ensuring consistent and reliable overall fastening performance of structural systems.
Widely applicable for large-scale steel structure engineering, heavy machinery assembly, power equipment infrastructure, municipal key projects and industrial heavy-load connection scenarios, DASt 021 high-hardness washers provide stable, safe and long-lasting auxiliary fastening guarantees for large-spec structural connection systems.

Manufacturer Advantages:
Different from ordinary fastener suppliers, we focus on integrated fastener system quality control and one-stop supporting services. We strictly screen and optimize every supporting washer accessory to eliminate unqualified products with uneven hardness, deformed surfaces and dimensional errors, effectively avoiding on-site assembly failure, preload attenuation and structural safety hazards caused by accessory quality problems. We support customized grading, packaging and batch delivery services to meet diverse engineering and procurement requirements of large infrastructure and heavy industrial projects.
With complete specification coverage, reliable standardized quality, professional matching capability and flexible service solutions, our DASt 021 washer supporting systems have long served global large-scale steel structure, power equipment and heavy machinery engineering projects. Relying on strict quality screening standards, stable supply capacity and considerate full-cycle after-sales service, we have established long-term stable and win-win cooperative relationships with customers worldwide.

Surface Finishing:
Zinc Planting, Hot-Dip Galvanizing, etc.