Washers are a vital component in every assembly in the fastening process and are a required component for successful operation. Washers can be used under the head of the fastener, bolt, screw and nut; and in many instances at multiple points in the assembly. Washers are designed to perform functions in particular applications and include locking, load spreading, protection, decorative, tension indicating, sealing, or a combination of these roles. Washers are also important for preventing galvanic corrosion, particularly by insulating steel screws from aluminium surfaces.
Washers have an in-depth history being used primarily on wheel axles to reduce damage to the wooden wheel and axles.
Historical records as written at the time:
1346 Accts. Exchequer King's Remembrancer Whashers
1544 Henry VIII XIX Spare wheles for small ordynaunce 12 pair, lynce~pynnes, wasshers
1611 Queen Anna's New World of Words An iron hoope, amongst gunners called a washer, which serues to keepe the iron pin at the end of the axeltree from wearing the naue.
1682 Town of Providence (Rhode Island) 3 Cart boxes, i lince pinn & a washer
1795 Herschel in Philosophy (Royal Soc.) It is keyed fast with proper washers between the joints to allow of a very smooth motion.
Flat washers Category Comparison
Din Standard Metric Product Comparison
British Standard Metric Product Comparison
USA Standard Metric Product Comparison
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Inch USA standard Product Comparison
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Hardened washers Category
Square Washers Product
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Serrated Safety Locking washer Schnorr
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External Tooth Lock washer Shakeproof Product Fan disc Product
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Toothed internal external combined washer Product