BS 4395 lugged washers are high-strength friction grip (HSFG) structural washers featuring three distinct perimeter protrusions.
These hardened steel washers strictly conform to the BS 4395 standard for heavy-duty structural engineering bolting assemblies.
Purpose of the Lugs
The perimeter lugs do not act as bendable locking tabs. Instead, they serve two primary engineering functions:
Visual Anchoring: They act as an anti-rotation mechanism against adjacent structural bracing during high-torque tightening.
Clearance Verification: The external pips allow quality assurance inspectors to confirm that a high-strength through-hardened washer was physically installed in the structural joint after full assembly.
Technical Profile
Mechanical Strength: Manufactured using through-hardened steel to handle structural preloads without crushing or experiencing material embedding.
Dimensions: Commonly produced for standard structural thread sizing from M12 to M36. For instance, an M24 lugged variant features the standard BS 4395 flat profile with extended material lugs on its outer boundary.
Surface Finishes: Widely distributed as self-colour (uncoated plain steel), bright zinc-plated, or hot-dip galvanised for exterior corrosion resistance.
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