Flat Spacers | McMaster-Carr

Filter by

System of Measurement

Screw Size

OD

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"

0.009" to 0.012"

0.010" to 0.013"

0.010" to 0.020"

0.010" to 0.030"

0.011" to 0.021"

0.012" to 0.018"

0.013" to 0.017"

0.013" to 0.019"

0.013" to 0.020"

0.013" to 0.027"

Material

Stainless Steel

Color

Finish

Corrosion-Resistant Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Performance

Abrasion Resistant

Chemical Resistant

Corrosion Resistant

Electrically Insulating

Finish-Your-Own

High Temperature

Impact Resistant

Low Temperature

Moisture Resistant

Hardness

Washer Designation

General Purpose

Specifications Met

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

DFARS Specialty Metals

RoHS

Compliant with Exemptions

Maximum Temperature

Less than 250° F

250° F to 299° F

300° F to 499° F

500° F to 999° F

1,000° F or greater

REACH

Export Control Classification Number (ECCN)

ASME Designation

Width

Minimum Temperature

-250° F or less

-249° F to -100° F

-99° F to -50° F

-49° F to -1° F

Greater than 0° F

Military Specification

Army-Navy Specification

Military Specification

Environment

Food and Beverage

Fastener Strength Rating

Certification

How can we improve?

5,584 Products

Washers

Oversized Washers

Oversized Washers

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

Plastic Washers

Plastic Washers

Lightweight, nonconductive, and naturally rust resistant

General Purpose Washers

General Purpose Washers

Your go-to metal washer for every screw size

Mil. Spec. Washers

Mil. Spec. Washers

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

Self-Retaining Washers

Self-Retaining Washers

Assemble screws and washers in advance to save time

Hard Fiber Washers

Hard Fiber Washers

Least likely to scratch delicate mounting surfaces

Undersized Washers

Undersized Washers

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

SAE Washers

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

Ultra-High-Temperature Ceramic Washers

Ultra-High-Temperature Ceramic Washers

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

ASME Washers

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

Mil. Spec. Plastic Washers

Mil. Spec. Plastic Washers

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

USS Washers

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

Fiberglass Washers

Fiberglass Washers

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

Adhesive-Back Washers

Adhesive-Back Washers

Stick on your surface to prevent slipping while you fasten

Magnetic Washers

Magnetic Washers

Stay in place on iron and steel surfaces during installation

Structural Washers

Structural Washers

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

Washers for Foam Insulation

Washers for Foam Insulation

Prevent screws from crushing insulation board

Tension-Indicating Structural Washers

Tension-Indicating Structural Washers

Change color when you apply the correct tension to prevent overtightening

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 Square-Neck Bolts

Washers for Square-Neck Bolts

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

Washers for Blind Rivets

Washers for Blind Rivets

Sized to fit around blind rivet diameters

Plastic Washer Assortments

Plastic Washer Assortments

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

Finish-Your-Own Washers

Finish-Your-Own Washers

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

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

General Purpose Washer Assortments

General Purpose Washer Assortments

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

Oversized Washer Assortments

Oversized Washer Assortments

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

SAE Washer Assortments

SAE Washer Assortments

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

Other Products

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Fastener Assortments

Fastener Assortments

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

Battery-Terminal Washers

Battery-Terminal Washers

Stop battery acid fumes from corroding terminal posts

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