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Star / Serrated Washer

Star / Serrated Washers are locking washers with teeth or serrations designed to prevent loosening of fasteners under vibration and load. They bite into the surface of the assembly, creating additional friction and resistance to rotation. Manufactured to ASTM and DIN standards, they are available in internal, external, and combination serration types. These washers enhance joint security in dynamic or high-vibration environments. They are widely used in machinery, automotive, aerospace, electrical assemblies, and heavy engineering.

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Premium Quality Star / Serrated Washer Supplier in Dubai, UAE

Unifastener Industries LLC is a reliable supplier and manufacturer of premium-quality Star and Serrated Washers in Dubai, UAE. The company specializes in industrial fastening and locking solutions designed for electrical systems, engineering works, automotive applications, machinery assembly, and heavy-duty industrial installations. Star Washers, also known as Serrated or Toothed Washers, are specially designed locking washers with internal or external teeth used to prevent fasteners from loosening due to vibration and movement. These washers provide excellent grip, secure locking performance, and reliable electrical grounding support in critical fastening applications. Manufactured using high-grade materials and advanced production standards, Star and Serrated Washers provide excellent strength, corrosion resistance, durability, and reliable long-lasting performance for industrial environments.

Standards:
– ASTM F436 (hardened steel washers)
– ASTM F959 (direct tension indicating washers, reference for serrations)
– DIN 6797 (serrated lock washers — internal, external, combination)
– ISO 7089 / 7090 (flat washers, reference standard with serration adaptation)

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

Material Options:
– Carbon steel
– Spring steel (heat-treated for locking action)
– Stainless steel (A2 / A4 grades)
– Brass (for non-magnetic and decorative use)

Diameter Range: M3 to M36 (metric) / 1/8″ to 1-1/2″ (inch)

Thickness Range: 0.5mm to 3mm depending on size

Types:
– Internal serrated (DIN 6797 J)
– External serrated (DIN 6797 A)
– Combination serrated (internal + external)
– Countersunk serrated washers (for CSK screws)

Properties:
– Provides strong grip against loosening due to vibration
– Increases friction between mating surfaces
– Prevents fastener rotation under load

Coating Options:
– Plain (self-color, oiled)
– Zinc electroplated
– Hot-dip galvanized (DIN EN ISO 1461)
– Black oxide
– Nickel plated

Add-ons:
– Can be supplied with bolts and nuts in locking assemblies
– Available in bulk or retail kits
– Certification (MTC) available on request

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