McMaster-Carr


Flat	Split Lock

Metal Bonded	Tooth Lock

Countersunk	Square

Sleeve	Spring Lock

Wave	Clipped

Wedge Lock	Spherical

Self-Retaining	Cup for Oversized Holes

Slotted	Leveling for I- Beams

Angled Edge	Adhesive Lock

Curved	Tab Lock

Square-Neck Bolt Lock

	OD OD

	ID ID

	Thickness Thickness

0.005"

0.007"

0.01"

0.013" to 0.019"

0.014" to 0.016"

0.015"

0.016"

0.017" to 0.023"

0.02"

0.021" to 0.041"

0.022" to 0.042"

0.024" to 0.034"

0.025" to 0.040"

0.026" to 0.036"

0.027" to 0.035"

0.028" to 0.034"

0.028" to 0.036"

0.029" to 0.035"

0.032" to 0.040"

0.040" to 0.050"

0.040" to 0.060"

0.042" to 0.051"

0.043" to 0.057"

0.045" to 0.055"

0.047" to 0.077"

0.047" to 0.109"

0.050" to 0.070"

0.050" to 0.080"

0.051" to 0.070"

0.051" to 0.080"

0.051" to 0.084"

0.051" to 0.104"

0.052" to 0.072"

0.053" to 0.065"

0.053" to 0.071"

0.053" to 0.073"

0.054" to 0.068"

0.054" to 0.070"

0.054" to 0.074"

0.055" to 0.065"

0.055" to 0.069"

0.056" to 0.070"

0.056" to 0.071"

0.057" to 0.067"

0.057" to 0.069"

0.057" to 0.075"

0.058" to 0.064"

0.059" to 0.065"

0.059" to 0.067"

0.059" to 0.069"

0.06"

0.060" to 0.064"

0.062"

0.063"

0.064" to 0.080"

0.064" to 0.104"

0.068" to 0.088"

0.070" to 0.076"

0.070" to 0.090"

0.071" to 0.091"

0.073" to 0.078"

0.073" to 0.083"

0.074" to 0.082"

0.074" to 0.094"

0.075" to 0.202"

0.077" to 0.087"

0.078" to 0.108"

0.079" to 0.098"

0.083" to 0.103"

0.084" to 0.104"

0.084" to 0.114"

0.085" to 0.101"

0.086" to 0.116"

0.088" to 0.098"

0.090" to 0.110"

0.090" to 0.112"

0.090" to 0.114"

0.093"

0.093" to 0.104"

0.094"

0.094" to 0.115"

0.105" to 0.130"

0.110" to 0.126"

0.110" to 0.140"

0.113" to 0.137"

0.115"

0.115" to 0.135"

0.120" to 0.130"

0.120" to 0.140"

1/8"

0.125" to 0.188"

0.167" to 0.193"

0.168" to 0.193"

0.170" to 0.190"

0.225" to 0.265"

0.230" to 0.270"

0.235" to 0.265"

0.236" to 0.264"

0.365" to 0.385"

	Specifications Met Specifications Met

ASME

ASTM

FDA

Mil. Spec.

NAS

SAE

SAE J314

USS

	Fastener Strength Grade/Class Fastener Strength Grade/Class

Grade 2

Grade 8

Grade 9

	Hardness Hardness

	Color Color

	Off-White		Black
	White		Gray
	Clear		Red
	Tan		Light Green
	Blue		Green
	Beige

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

	Width Width

	Length Length

	ASME Designation ASME Designation

Narrow

Wide

Regular

	Tooth Location Tooth Location

	External
	Internal
	Internal/External

	Overall Height Overall Height

	Seal Material Seal Material

Rubber

Plastic

	Sleeve OD Sleeve OD

	Shape Shape


Ring	Round

	Seal Color Seal Color

	Black
	Green

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520 Products

About Washers

General Purpose Washers

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.

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.

Plastic Washers

Mil. Spec. Plastic Washers

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

Chemical-Resistant Plastic Washers

These washers surpass most other plastic washers when it comes to withstanding chemicals, oil, and grease.

Mil. Spec. Chemical-Resistant
Plastic Washers

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

Electrical-Insulating Plastic Washers

Water- and Steam-Resistant
Plastic Washers

Low moisture absorption and good heat resistance make these washers suitable for wet and harsh environments.

High-Temperature Plastic Washers

These washers can withstand temperatures up to 500° F without degrading.

Extreme-Temperature
Ceramic Washers

These washers hold up in blistering temperatures up to 3000° F.

Countersunk Washers

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

Square Washers

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

Electrical-Insulating Sleeve Washers

Also known as shoulder washers.

Extra-Tall Electrical-Insulating
Rolled-Collar Sleeve Washers

The extra-tall sleeve extends into holes to provide more protection than other rolled-collar washers.

Electrical-Insulating
Rolled-Collar Sleeve Washers

As you tighten your screw, the rolled collar compresses under the head to create an insulating barrier between a screw shank and a mating surface.

Clipped Washers

Clipped to fit where standard washers can't, these 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.

Self-Retaining Washers

A specially shaped ID grips your screw shank tightly.

Cup Washers for Oversized Holes

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

Easy-Install Slotted Washers

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

Sleeve Washers for Soft Material

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

Angled-Edge Washers
for Tie-Down Straps

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

Angled-Edge Washers for
Toggle Clamp Holding Screws

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

Curved Washers

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

Lock Washers

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.

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

Oversized Split Lock Washers

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

External-Tooth Lock Washers

Teeth on the outside edge of the washer 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.

Countersunk External-Tooth
Lock Washers

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

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.

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.

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 Plastic Screws

Designed for use with plastic screws, these acetal washers are good electrical insulators. They are excellent for use under water and in rotating assemblies.

Wedge Lock Washers

Also known as NORD-LOCK® 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.

Adhesive Lock Washers

When a metal fastener is tightened onto the washer, the embedded epoxy activates and bonds the underside of the fastener head to the mating surface to prevent loosening. The adhesive fills gaps and spaces that other washers fail to seal.

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.

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.

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.

Weather-Resistant
Rubber Sealing Washers

Sunlight, ozone, and water won’t affect these washers.

Abrasion-Resistant Rubber
and Plastic Sealing Washers

Made of durable material, these washers resist wear from rubbing and scraping surfaces.

Oil-Resistant Rubber
Sealing Washers

These washers surpass other rubber washers when it comes to withstanding oil, grease, and fuel.

Chemical-Resistant
Rubber Sealing Washers

These washers withstand harsh chemicals such as acetic acid and isopropyl alcohol.

Leveling and Wave Washers

Triple-Wave Washers

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

Leveling Washers

Leveling Washers for I-Beams

Cushioning Washers

Abrasion-Resistant
Cushioning Washers

These SBR rubber washers are reinforced with cloth fibers.

Abrasion-Resistant Leather Washers

These leather washers are nonmarring.

Moisture-Resistant
Cushioning Washers

These polyurethane washers withstand wet conditions as well as sunlight, ozone, and some chemicals.

Cushioning Washers

These wool felt washers can be soaked with oil to lubricate joints.

Shims for Shoulder Screws

Shims for Shortening
Screw Shoulders

Slide these shims under the screw head to shorten the shoulder length.

Shims for Lengthening
Screw Shoulders

Spin these shims onto screw threads to extend the shoulder length.

Unthreaded Spacers

Aluminum Unthreaded Spacers

Made of aluminum, these spacers are lightweight and mildly corrosion resistant.

18-8 Stainless Steel
Unthreaded Spacers

18-8 stainless steel spacers have good corrosion resistance.

Zinc-Plated Steel
Unthreaded Spacers

The zinc plating provides some corrosion resistance.

316 Stainless Steel
Unthreaded Spacers

These spacers have excellent corrosion resistance and are passivated for enhanced protection.

Zinc-Plated Brass
Unthreaded Spacers

Brass makes these spacers electrically conductive and the zinc-plated finish adds corrosion resistance.

Nylon Unthreaded Spacers

These spacers have excellent wear and abrasion resistance. Exposure to moisture may cause them to expand.

LDPE Unthreaded Spacers

Choose LDPE spacers for their excellent moisture resistance.

Polypropylene Unthreaded Spacers

Polypropylene spacers have a hard surface and resist many chemicals and solvents.

PTFE Unthreaded Spacers

PTFE spacers have a slippery surface and surpass most plastic spacers when it comes to chemical resistance and performance in extreme temperatures.

Acetal Unthreaded Spacers

Naturally slippery and wear resistant, acetal spacers also offer some resistance to moisture.

PEEK Unthreaded Spacers

Use PEEK spacers as an alternative to metal spacers in high-temperature, high-stress applications. They resist chemicals, wear, and moisture.

Polycarbonate Unthreaded Spacers

Made of FDA-listed material, these clear spacers can be used in food and beverage applications.

Polished Unthreaded Spacers

With their mirror-like finish, these are the go-to spacers when appearance matters.

Unthreaded Spacer Stock

Cut stock to the length you need.

Electrical-Insulating
Unthreaded Spacers

Protect components from electrical charges.

Unthreaded Spacers for Angles

The 45° end fits against an angled surface to create a flat surface for connection.

Unthreaded Inserts

Steel Unthreaded Inserts for Plastic

A zinc-plated finish gives these steel inserts mild corrosion resistance.

Unthreaded Inserts for Metal

Protect bolts from sideways (shear) pressure.

Round Push Nuts

With flexible teeth that slide smoothly over threads of any pitch, these push nuts can be used alone for light-duty applications or as a jam nut.

Terms and Conditions and Privacy Policy

About Washers

Washers

General Purpose Washers

Oversized Washers

Mil. Spec. Washers

SAE Washers

USS Washers

ASME Washers for Soft Material

Washers with Material Certification

Plastic Washers

Mil. Spec. Plastic Washers

Chemical-Resistant Plastic Washers

Mil. Spec. Chemical-ResistantPlastic Washers

Electrical-Insulating Plastic Washers

Water- and Steam-ResistantPlastic Washers

High-Temperature Plastic Washers

Extreme-TemperatureCeramic Washers

Countersunk Washers

Square Washers

Electrical-Insulating Sleeve Washers

Extra-Tall Electrical-InsulatingRolled-Collar Sleeve Washers

Electrical-InsulatingRolled-Collar Sleeve Washers

Clipped Washers

Double-Clipped Washers

Self-Retaining Washers

Cup Washers for Oversized Holes

Easy-Install Slotted Washers

Sleeve Washers for Soft Material

Angled-Edge Washersfor Tie-Down Straps

Angled-Edge Washers forToggle Clamp Holding Screws

Curved Washers

Lock Washers

Split Lock Washers

Mil. Spec. Split Lock Washers

Split Lock Washers forSocket Head Screws

Oversized Split Lock Washers

External-Tooth Lock Washers

Mil. Spec. External-ToothLock Washers

Countersunk External-ToothLock Washers

Internal-Tooth Lock Washers

Mil. Spec. Internal-ToothLock Washers

Internal-Tooth LockWashers for Soft Material

Internal-/External-ToothLock Washers

Belleville Spring Lock Washersfor Socket Head Screws

Belleville Spring Lock Washers

Spring Lock Washersfor Plastic Screws

Wedge Lock Washers

Adhesive Lock Washers

Tab Lock Washers

Square-Neck Bolt Lock Washers

Sealing Washers

High-Pressure-RatedMetal-Bonded Sealing Washers

Pressure-Rated Metal-BondedSealing Washers

Pressure-Rated Metal-BondedSealing Washers for Nuts and Washers

Metal-Bonded Sealing Washers

Weather-ResistantRubber Sealing Washers

Abrasion-Resistant Rubberand Plastic Sealing Washers

Oil-Resistant RubberSealing Washers

Chemical-ResistantRubber Sealing Washers

Leveling and Wave Washers

Triple-Wave Washers

Leveling Washers

Leveling Washers for I-Beams

Cushioning Washers

Abrasion-ResistantCushioning Washers

Abrasion-Resistant Leather Washers

Moisture-ResistantCushioning Washers

Cushioning Washers

Shims for Shoulder Screws

Shims for ShorteningScrew Shoulders

Shims for LengtheningScrew Shoulders

Unthreaded Spacers

Aluminum Unthreaded Spacers

18-8 Stainless SteelUnthreaded Spacers

Zinc-Plated SteelUnthreaded Spacers

316 Stainless SteelUnthreaded Spacers

Zinc-Plated BrassUnthreaded Spacers

Nylon Unthreaded Spacers

LDPE Unthreaded Spacers

Polypropylene Unthreaded Spacers

Mil. Spec. Chemical-Resistant
Plastic Washers

Water- and Steam-Resistant
Plastic Washers

Extreme-Temperature
Ceramic Washers

Extra-Tall Electrical-Insulating
Rolled-Collar Sleeve Washers

Electrical-Insulating
Rolled-Collar Sleeve Washers

Angled-Edge Washers
for Tie-Down Straps

Angled-Edge Washers for
Toggle Clamp Holding Screws

Split Lock Washers for
Socket Head Screws

Mil. Spec. External-Tooth
Lock Washers

Countersunk External-Tooth
Lock Washers

Mil. Spec. Internal-Tooth
Lock Washers

Internal-Tooth Lock
Washers for Soft Material

Internal-/External-Tooth
Lock Washers

Belleville Spring Lock Washers
for Socket Head Screws

Spring Lock Washers
for Plastic Screws

High-Pressure-Rated
Metal-Bonded Sealing Washers

Pressure-Rated Metal-Bonded
Sealing Washers

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

Weather-Resistant
Rubber Sealing Washers

Abrasion-Resistant Rubber
and Plastic Sealing Washers

Oil-Resistant Rubber
Sealing Washers

Chemical-Resistant
Rubber Sealing Washers

Abrasion-Resistant
Cushioning Washers

Moisture-Resistant
Cushioning Washers

Shims for Shortening
Screw Shoulders

Shims for Lengthening
Screw Shoulders

18-8 Stainless Steel
Unthreaded Spacers

Zinc-Plated Steel
Unthreaded Spacers

316 Stainless Steel
Unthreaded Spacers

Zinc-Plated Brass
Unthreaded Spacers

Electrical-Insulating
Unthreaded Spacers