Flat Washers | McMaster-Carr

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System of Measurement

Screw Size

Material

Stainless Steel

OD

Washer Type

ID

Thickness

0.001" to 0.003"

0.002" to 0.004"

0.004" to 0.006"

0.005" to 0.006"

0.005" to 0.024"

0.005" to 0.030"

0.008" to 0.012"

0.008" to 0.02"

Finish

Corrosion-Resistant Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Washer Designation

General Purpose

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

Performance

Abrasion Resistant

Chemical Resistant

Corrosion Resistant

Electrically Insulating

Extreme Vibration Resistant

Finish-Your-Own

High Temperature

Impact Resistant

Thread Size

Specifications Met

Federal Specification

Color

Shaft Diameter

Hardness

ASME Designation

Length

DFARS Specialty Metals

RoHS

Compliant with Exemptions

Fastener Strength Rating

Shape

REACH

Overall Height

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

Export Control Classification Number (ECCN)

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11,277 Products

Washers

General Purpose Washers

General Purpose Washers

Your go-to metal washer for every screw size

SAE Washers

Meet SAE sizing standards and typically have smaller diameters than USS washers

Oversized Washers

Oversized Washers

Exaggerated diameters and thicknesses to cover large holes or to create gaps

Mil. Spec. Washers

Mil. Spec. Washers

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

USS Washers

Meet USS sizing standards and typically have larger diameters than SAE washers

ASME Washers

Meet ASME standards and come in regular, narrow, and wide diameters

Plastic Washers

Plastic Washers

Lightweight, nonconductive, and naturally rust resistant

Structural Washers

Structural Washers

Distribute pressure under structural screws and nuts in columns, joists, and I-beams

Undersized Washers

Undersized Washers

Pair with fasteners that have narrow heads, such as cheese and socket head screws

Hard Fiber Washers

Hard Fiber Washers

Least likely to scratch delicate mounting surfaces

Fiberglass Washers

Fiberglass Washers

Best strength-to-weight ratio of all our nonmetal washers

Self-Retaining Washers

Self-Retaining Washers

Assemble screws and washers in advance to save time

Mil. Spec. Plastic Washers

Mil. Spec. Plastic Washers

Meet U.S. military standards and are lightweight, nonconductive, and naturally rust resistant

Adhesive-Back Washers

Adhesive-Back Washers

Stick on your surface to prevent slipping while you fasten

Clipped Washers

Clipped Washers

Clipped on one side to fit in tight spots

Square Washers

Won't rotate as you fasten screws in slots and channels

Washers for Square-Neck Bolts

Washers for Square-Neck Bolts

The square hole fits snugly around carriage, plow, and elevator bolts

Tension-Indicating Structural Washers

Tension-Indicating Structural Washers

Change color when you apply the correct tension to prevent overtightening

Ultra-High-Temperature Ceramic Washers

Ultra-High-Temperature Ceramic Washers

Withstand the highest temperatures of all our washers up to 3000° F

Rectangular Washers

Rectangular Washers

Our narrowest washers to fit in thin channels, slots, and other tight spaces

Washers for Blind Rivets

Washers for Blind Rivets

Sized to fit around blind rivet diameters

Double-Clipped Washers

Double-Clipped Washers

Squeeze into tighter spots than single-clipped washers

Easy-Install Slotted Washers

Easy-Install Slotted Washers

Slip under nuts and screws without having to disassemble them

General Purpose Washer Assortments

General Purpose Washer Assortments

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

Finish-Your-Own Washers

Finish-Your-Own Washers

Punch a hole to create a custom inner diameter for uncommon screw sizes

Plastic Washer Assortments

Plastic Washer Assortments

A selection of lightweight, nonconductive, and naturally rust-resistant washers

Extra-High-Temperature Mica Washers

Extra-High-Temperature Mica Washers

Won't melt, stick, or become brittle, even when exposed to temperatures as high as 1050° F

Washers for Foam Insulation

Washers for Foam Insulation

Prevent screws from crushing insulation board

Magnetic Washers

Magnetic Washers

Stay in place on iron and steel surfaces during installation

SAE Washer Assortments

SAE Washer Assortments

A range of sizes that meet SAE standards—typically have smaller diameters than USS washers

USS Washer Assortments

USS Washer Assortments

A collection of sizes that meet USS specifications—typically larger diameters than SAE washers

Perforated Washers

Perforated Washers

Plaster flows through to form a bond between the washer and wall

Oversized Washer Assortments

Oversized Washer Assortments

A collection of exaggerated sizes to cover large holes or to create gaps

Square Washers for Blind Rivets

Square Washers for Blind Rivets

Won't rotate as you fasten blind rivets in slots and channels

Other Products

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Lock Washers

Resist vibration to prevent fasteners from loosening

Shims

Align and space components on shafts, or level machinery, cabinets, and doors

Thrust Bearings

Thrust Bearings

Support loads parallel to the shaft with plain, ball, or roller bearings

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Thrust Roller Bearing Washers

Thrust Roller Bearing Washers

Adapt needle-roller thrust bearings for use on unhardened, unground surfaces

Electrical Enclosure Fasteners

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

Disc Springs

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

Battery-Terminal Washers

Battery-Terminal Washers

Stop battery acid fumes from corroding terminal posts

Faucet Washers

Seal faucet components so they don’t leak

Tag Washers

Bolt onto surfaces to mount tag rings and ties

Fastener Assortments

Fastener Assortments

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

Spacers

Unthreaded to create space between two surfaces or objects, often to align them

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

Strut Channel Washers

Strut Channel Washers

Pair with hex nuts to connect threaded rod to strut channel

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)