Lock Washers | McMaster-Carr

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Zinc Yellow-Chromate Plated

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Hardness

Rockwell C40 to Rockwell C50

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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Military Specification

NASM35333

Fastener Strength Rating

3,585 Products

Lock Washers

Split Lock

Split Lock Washers

Stop nuts and screws from loosening due to light vibration

376 products

Split Lock Washers for Socket Head Screws

Fit neatly under screws with narrow heads

156 products

Mil. Spec. Split Lock Washers

Adhere to U.S. military standards for material and construction

67 products

Split Lock Washer Assortments

A collection of common sizes to fit the broadest range of applications

6 products

Tooth Lock

Tooth Lock Washers

Grip tighter than split lock washers in applications with constant movement, such as conveyors

318 products

Mil. Spec. Tooth Lock Washers

Adhere to U.S. military standards for material and construction

70 products

Countersunk Tooth Lock Washers

Grip flat- and oval-head screws for a secure hold without overtightening

31 products

Tooth Lock Washer Assortments

Keep a collection of tooth lock washers on hand to work with a range of screw sizes

1 product

Domed Tooth Lock Washers

Spread pressure over a large area to limit damage to material

6 products

Wedge Lock

Extreme-Vibration-Resistant Wedge Lock Washers

The tightest grip of all our washers for use on equipment with jarring starts and stops

134 products

Spring Lock

Heavy-Vibration-Resistant Spring Lock Washers

Won't loosen on equipment with constant, vigorous vibration; also known as Belleville washers

161 products

Heavy-Vibration-Resistant Spring Lock Washers for Socket Head Screws

Fit neatly under screws with narrow heads; also known as Belleville washers

77 products

Wave Spring Lock Washers

Keep bolted assemblies secure on slightly uneven surfaces

142 products

Curved Spring Lock Washers

A step up from flat washers, these stop nuts and screws from loosening due to slight movement

78 products

Tab Lock

Tab Lock Washers

Bend the tabs up or down to resist loosening from moderate vibration, such as pumps

32 products

Coil Lock

Coil Lock Washers

Create more tension than split lock washers for a tighter hold on materials that contract and expand

4 products

Other Products

Bearing Lock Washers

Lock bearing nuts in place to prevent loosening due to vibration

103 products

Disc Springs

Maintain tension and separate components on shafts, under bolt heads, and at the ends of valves

1,680 products

Washers

Nearly every size and shape imaginable, from flat washers to clipped to curved

42 products

Clamp Holding Washers

Replace worn washers on open-arm toggle clamps to keep holding screws in place

12 products

Fastener Assortments

Keep a variety of common screws, nuts, and washers on hand

7 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

82 products