Metal Lock Washers | McMaster-Carr

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Fastener Strength Grade/Class Fastener Strength Grade/Class

Grade 2

	Tooth Location Tooth Location

	External
	Internal
	Internal/External

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Length Length

	Overall Height Overall Height

	Shape Shape


Round	Ring

Slotted	D-Profile

Tapered	Keyed

Disc	Sheet and Bar

Rectangle	Made to Order

	For Shaft Diameter For Shaft Diameter

	For OD For OD

	ASME Designation ASME Designation

Narrow

Regular

Wide

	Retaining Ring Style Retaining Ring Style


Standard	Push On

Side Mount	Spiral

Constant Section	Crimp On

Clip On

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16,975 Products

Washers

General Purpose Washers

Metric General Purpose Washers

Use these metric washers to evenly distribute the load under bolt or screw heads and nuts when fastening. They can also act as spacers.

Oversized Washers

Compared to our general purpose washers, these have exaggerated diameters and/or thicknesses for covering oversized holes or for use as spacers and levelers.

Metric Oversized Washers

Compared to our general purpose washers, these have exaggerated diameters and/or thicknesses. Use them to cover oversized holes, hold heavy fastening loads, or as spacers and levelers.

Mil. Spec. Washers

Choose these washers for their adherence to strict military standards for material and construction.

SAE Washers

SAE washers generally have a smaller ID and OD than USS washers.

USS Washers

USS washers generally have a larger ID and OD than SAE washers.

ASME Washers for Soft Material

Also known as Type B washers, these distribute your fastener's load over a larger surface area than other washers to minimize damage to soft materials.

Washers with Material Certification

These washers come with a traceable lot number and a physical and chemical test report.

Washers for Structural Applications

Designed for use with A325 structural screws, studs, and nuts, these washers are often used for construction and exterior building applications.

Tension-Indicating Washers for Structural Applications

When you’ve applied the correct tension, these washers release an orange dye as a visual indicator.

Metric Washers for Structural Applications

These thick washers are designed to support structural screws, studs, and nuts.

Washers for Blind Rivets

Also known as backup washers, these are for use with blind rivets for extra support when fastening into soft material.

Countersunk Washers

Flat and oval head screws sit flush within these washers for a neat, finished appearance.

Metric Countersunk Washers

Flat and oval head screws sit flush within these metric washers for a neat, finished appearance.

Finishing Countersunk Washers

Metric Finishing Countersunk Washers

Clipped Washers

Clipped to fit where standard washers can't, these won't rotate when you position the flat edge against a flat surface.

Oversized Clipped Washers

With greater diameters and/or thicknesses than general purpose washers, these washers cover oversized holes or act as spacers and levelers. Clipped to fit where standard washers can’t, they won’t rotate when you position the flat edge against a flat surface.

Double-Clipped Washers

Clipped on both sides to fit where standard washers can't, these won't rotate when you position the flat edges against a flat surface.

Square Washers

Square washers fit into slots and channels and have flat sides to keep them from rotating.

Square Washers for Blind Rivets

Also known as backup washers, these are for use with blind rivets for extra support when fastening into soft material.

Sleeve Washers for Soft Material

Reinforce holes in soft material to keep them from collapsing around screws.

Easy-Install Slotted Washers

A slot in the side allows you to install and remove these washers without completely disassembling your joint.

Angled-Edge Washers for
Toggle Clamp Holding Screws

Use on clamps with open arms to keep the holding screw in place.

Angled-Edge Washers for Tie-Down Straps

Use the angled edges to hold and align tie-down straps.

Steel Washers for Rigid Insulation

Steel washers provide a stronger bearing surface than plastic washers

Cup Washers for Oversized Holes

Cover oversized holes and the ends of tubes and pipe with these cup-shaped washers.

Washers for Plaster

Repair sagging, cracked plaster with these washers. The holes allow plaster to flow through to form a secure bond between the washer and the wall.

Washers for Foam Insulation

These washers have prongs that pierce foam insulation so they stay in place.

Curved Washers

Also known as saddle washers, these curved washers fit round surfaces such as tubes and pipe.

Split Lock Washers

As a screw is tightened, these washers flatten to add tension to the joint and prevent loosening from small amounts of vibration.

Metric Split Lock Washers

Mil. Spec. Split Lock Washers

Choose these washers for their adherence to strict military standards for material and construction.

Split Lock Washers for Socket Head Screws

Metric Split Lock Washers for Socket Head Screws

Oversized Split Lock Washers

Compared to standard split lock washers, these are thicker and have larger outside diameters.

Tooth Lock Washers

External-Tooth Lock Washers

Teeth on the outside edge of the washer bite into the screw head and joint for a tight grip.

Metric External-Tooth Lock Washers

Teeth on the outside edge of these metric washers bite into the screw head and joint for a tight grip.

Mil. Spec. External-Tooth Lock Washers

Choose these washers for their adherence to strict military standards for material and construction.

Tight-Grip External-Tooth Lock Washers

The teeth on these washers bite further into the screw head and joint than standard external-tooth washers to provide a stronger hold.

Countersunk External-Tooth Lock Washers

The teeth on these washers firmly grip heads of 82° flat head countersunk screws.

Countersunk Tight-Grip External-Tooth Lock Washers

To keep 90° countersunk screws from loosening in vibration applications, the teeth on these washers bite further into the screw head and joint than standard external-tooth lock washers for a more secure hold.

Internal-Tooth Lock Washers

Internal teeth dig into the screw head while the smooth outside edge won't snag objects. Use with fasteners that have small heads, such as fillister and cheese head screws.

Metric Internal-Tooth Lock Washers

Internal teeth dig into the screw head while the smooth outside edge won't snag objects. Use with metric fasteners that have small heads, such as fillister and cheese head screws.

Mil. Spec. Internal-Tooth Lock Washers

Choose these washers for their adherence to strict military standards for material and construction.

Internal-Tooth Lock Washers for Soft Material

Slightly domed with an oversized outside diameter, these washers distribute your fastener's load over a larger surface area than other internal-tooth lock washers to limit damage to soft material.

Internal-/External-Tooth Lock Washers

The combination of internal and external teeth boosts gripping power to maintain a tight hold and provide more vibration resistance than other tooth lock washers. Use with fasteners that have heads large enough to make contact with the external teeth, such as pan, button, and binding head screws.

Spring Lock Washers

Belleville Spring Lock Washers for Socket Head Screws

These washers have smaller outside diameters than standard spring lock washers to fit neatly under socket head cap screws.

Belleville Spring Lock Washers

Also known as conical washers, these have a slightly cupped shape that gives them spring-like flexibility to grip tighter than split and tooth lock washers.

Spring Lock Washers for Slotted Bearing Nuts

Designed for use with bearing nuts, these lock washers have a conical shape that presses like a spring against bearings, bushings, gears, and pulleys to hold them in place on your threaded shaft or spindle.

Metric Spring Lock Washers

The arched shape of these washers presses up against a bolt and down against a nut to prevent loosening from wear, vibration, or temperature changes.

Wedge Lock Washers

Comparable to NORD-LOCK® and Sherex TEC Series washers, these two-piece washers provide more locking power than split, tooth, and spring lock washers. Wedges on the inside lock the two pieces together, and serrations on the exterior grip surfaces to resist loosening from high vibration and shifting.

Tab Lock Washers

Bend one tab against the side of the mounting surface and the other tab against the flats on a bolt or nut to prevent both the fastener and washer from turning and loosening in high-vibration applications, such as a motor mount.

Metric Tab Lock Washers

Bend the tab of these metric lock washers against the flats of a hex nut or bolt head to prevent the fastener and washer from turning and loosening due to vibration, wear, or changes in temperature.

Square-Neck Bolt Lock Washers

Designed for use with square-neck bolts such as carriage bolts, these washers have teeth that dig into wood and other soft material to prevent rotation.

Sealing Washers

High-Pressure-Rated Metal-Bonded Sealing Washers

Able to withstand pressure greater than 3,000 psi, these one-piece bonded washers create the tightest seals.

Metric High-Pressure-Rated
Metal-Bonded Sealing Washers

Able to withstand pressure greater than 7,000 psi, these one-piece bonded washers create the tightest seals.

Pressure-Rated Metal-Bonded Sealing Washers

These washers are rated to withstand pressure up to 100 psi.

Pressure-Rated Metal-Bonded Sealing
Washers for Nuts and Washers

Also known as thread-sealing washers, use these under nuts and other washers.

Metal-Bonded Sealing Washers

Create a stronger seal than metal or rubber alone. These one-piece washers are metal for strength with a bonded rubber seal that creates a tight grip.

Metal Sealing Washers

Also known as crush washers, these compress when tightened to form a tighter, more durable seal than rubber washers. They are commonly used to seal fluids such as oil and fuel.

Leveling and Wave Washers

Triple-Wave Washers

With three points of surface contact, these washers provide more stability than single-wave washers.

Metric Single-Wave Washers

These curved, flexible washers act like springs to compensate for tolerance variations and uneven surfaces.

Single-Wave Washers

These curved, flexible washers act like springs to compensate for tolerance variations and uneven surfaces.

Washers

General Purpose Washers

Metric General Purpose Washers

Oversized Washers

Metric Oversized Washers

Mil. Spec. Washers

SAE Washers

USS Washers

ASME Washers for Soft Material

Washers with Material Certification

Washers for Structural Applications

Tension-Indicating Washers for Structural Applications

Metric Washers for Structural Applications

Washers for Blind Rivets

Countersunk Washers

Metric Countersunk Washers

Finishing Countersunk Washers

Metric Finishing Countersunk Washers

Clipped Washers

Oversized Clipped Washers

Double-Clipped Washers

Square Washers

Square Washers for Blind Rivets

Sleeve Washers for Soft Material

Easy-Install Slotted Washers

Angled-Edge Washers forToggle Clamp Holding Screws

Angled-Edge Washers for Tie-Down Straps

Steel Washers for Rigid Insulation

Cup Washers for Oversized Holes

Washers for Plaster

Washers for Foam Insulation