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Washers
Washers are disks of metal or non-metallic material placed beneath a nut, an
axle bearing, or a joint, to relieve friction, prevents leakage, isolate,
prevent loosening or distribute pressure. There are many different types of
washers and washer type products for a variety of applications. Common types
include flat washers, beveled, C-washers, D-shaped washers, countersunk or
finishing washers, fender washers, lock washers, SAE washers, sealing washers,
spherical washers, square washers, tab washers, torque washers, shoulder
washers, and spring washers. Flat washers are thin, flat, and circular
general-purpose washers, with a centrally located hole. Beveled washers have a
tapered bearing surface. C-washers have a slot cut from the center to the
perimeter. Typically the slot is the same width as the "center hole." D-shape
washers have a flat edge cut away on the parameter. Countersunk washers come in
a number of shapes: 90 degree countersunk, angle countersunk, flanged, unflanged,
rolled flange, etc.
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Most people are familiar with the
finishing type used for cosmetic purposes on many consumer products. Fender
washers have a large outside diameter in comparison to the inside diameter.
External tooth lockwashers have teeth around the outer perimeter of the washer.
Helical spring lockwashers are split rings of metal or steel that when
tightened, resist loosening. Internal tooth lockwashers have teeth around the
internal perimeter. SAE washers are approved by the Society of Automotive
Engineers. Sealing washers seal around a bolt or fastener. Spherical washers
have a cross-section in the form of a half or partial sphere. Square washers can
have a rectangle shaped inside or outside profile. Tab washers have a tab(s)
that may be bent for the purpose of locking. Tab washers are made in an almost
infinite variety of configurations with internal and/or external notches and/or
tabs, single or multiple, formed or flat. Torque washers have sharp prongs
formed to sink into the mating surface. These washers are used for anti-rotation
between washer and mating surface. Shoulder washers have a sleeve with the same
inner diameter as washer hole.
Washers can be specified in ANSI nominal sizes or ANSI metric sizes. Important
size dimensions to consider when specifying washers include inside diameter,
outside diameter, thickness or working height, and rated or working load.
Metallic materials of construction available for washers include aluminum,
brass, copper base alloy or bronze, copper, nickel base alloy, spring steel,
steel, hardened steel, stainless steel, and titanium. Non-metallic materials of
construction include ABS, acetal, asbestos, felt, leather, nylon, polyester,
polycarbonate, polyethylene, PVC, polypropylene, PTFE, and rubber. Common
finishes for washers include anodize, black oxide, phosphate, galvanized, nickel
plated, tin plated, zinc plated, and zinc chromate.
Washers : Flat washers , USS flat washers , SAE flat washers , Fender washers , Lock washers , Lock washers external tooth
, Lock washers internal tooth , Finishing washers , Dock washers , Square dock washers ,
Ogee washers
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Anchors
Bolts
Captive
Fasteners Hook
and Loop Fasteners Industrial
Pins Lockbolts
Locknuts,
Precision
Nails
Nuts
Quick
Connect Fasteners Retaining
Rings and Snap Rings Rivets
Screws
Self-sealing
Fasteners
Snap
Fasteners Specialty
Fasteners Spikes
Spring
Washers Staples
Studs
Threaded
Assemblies
Threaded
Inserts Threaded
Rod Washers
Wave
Washers Zippers
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