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Star / Serrated Washer
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Spring Washer
Spring Washer

Contact / Conical Washer

Contact / Conical Washers are specially designed spring-type washers that provide elastic force to maintain bolt tension under load. Their conical shape allows controlled deflection, improving the security of bolted joints against loosening. Manufactured to ASTM and DIN standards, they are widely used in heavy-duty and high-vibration environments. These washers ensure load distribution, prevent fatigue loosening, and enhance joint reliability.  They are commonly used in structural steelwork, railways, wind turbines, automotive, and heavy machinery.

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Description

Premium Quality Contact / Conical Washer Supplier in Dubai, UAE

Unifastener Industries LLC is a reliable supplier and manufacturer of premium-quality Contact and Conical Washers in Dubai, UAE. The company specializes in industrial fastening and load management solutions designed for electrical systems, engineering works, machinery assembly, construction projects, and heavy-duty industrial applications. Contact and Conical Washers are specially designed fastening support components used to provide spring tension, maintain secure bolt preload, improve electrical conductivity, and distribute load efficiently in fastening assemblies. These washers help reduce loosening caused by vibration and ensure reliable fastening stability in demanding environments. Manufactured using high-grade materials and advanced production standards, Contact and Conical Washers provide excellent strength, elasticity, corrosion resistance, and long-lasting industrial performance.


Standards:
– ASTM F959 (load-indicating and conical-type washers)
– ASTM F436 (hardened washers, reference for structural use)
– DIN 6796 (conical spring washers for bolted joints)
– ISO 7093 / ISO 7094 (large series washers, adapted for conical type)

Grades:
– ASTM Grades: F436, F959
– DIN / ISO Grades: 8.8, 10.9, 12.9 (washer hardness compatibility with bolt grades)

Material Options:
– Spring steel (heat-treated for elasticity)
– Carbon steel
– Stainless steel (A2 / A4 grades)
– Alloy steel (for heavy-duty applications)

Diameter Range: M6 to M36 (metric) / 1/4″ to 1-1/2″ (inch)

Thickness Range: 1.5mm to 8mm depending on size

Types:
– Conical spring washer (DIN 6796)
– Contact washer (provides load distribution and locking)
– Heavy-duty conical washers for structural bolting

Properties:
– Maintains bolt preload under dynamic loads
– Provides elastic deflection to absorb vibration
– Reduces risk of bolt loosening in cyclic loading

Coating Options:
– Plain (self-color, oiled)
– Phosphated & oiled
– Zinc electroplated
– Hot-dip galvanized (DIN EN ISO 1461)
– Mechanical galvanized

Add-ons:
– Can be supplied with structural bolt assemblies (ASTM A325 / A490, DIN 6914)
– Available with MTC and fatigue test certification
– Bulk or kit packaging options

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