- National Bolt & Nut’s line of heavy-duty structural washers are ideal for structural steel fastening applications and are commonly used by the wind turbine and industrial building industries to ensure that all combined steel parts are truly secure and set in place.
- Made from hardened alloy steel, our line of structural washers are heat-treated and constructed to meet ASTM F436 specifications for both dimension and finish.
- Other materials and finishes available. For further information, call or send an information request.
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