Thick Flat Washers | McMaster-Carr

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System of Measurement

Screw Size

OD

Thickness

0.005" to 0.030"

0.008" to 0.012"

0.013" to 0.020"

0.016" to 0.025"

0.017" to 0.023"

0.017" to 0.028"

0.018" to 0.022"

0.019" to 0.021"

0.020" to 0.040"

0.025" to 0.040"

0.025" to 0.045"

0.026" to 0.036"

0.027" to 0.035"

0.027" to 0.048"

0.028" to 0.034"

Material

Stainless Steel

ID

Finish

Corrosion-Resistant Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

Washer Designation

General Purpose

Performance

Abrasion Resistant

Chemical Resistant

Corrosion Resistant

Electrically Insulating

High Temperature

Impact Resistant

Moisture Resistant

Precision Adjust

Hardness

Specifications Met

Color

Shaft Diameter

DFARS Specialty Metals

ASME Designation

Military Specification

Army-Navy Specification

Military Specification

REACH

RoHS

Compliant with Exemptions

Export Control Classification Number (ECCN)

Fastener Strength Rating

Maximum Temperature

Less than 160° F

160° F to 199° F

200° F to 249° F

250° F to 499° F

500° F or greater

Minimum Temperature

Application

Minimum Hardness

Environment

How can we improve?

1,483 Products

Washers

General Purpose Washers

General Purpose Washers

Your go-to metal washer for every screw size

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

SAE Washers

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

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

Undersized Washers

Undersized Washers

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

Structural Washers

Structural Washers

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

Plastic Washers

Plastic Washers

Lightweight, nonconductive, and naturally rust resistant

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

Ultra-High-Temperature Ceramic Washers

Ultra-High-Temperature Ceramic Washers

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

Adhesive-Back Washers

Adhesive-Back Washers

Stick on your surface to prevent slipping while you fasten

Other Products

Shims

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

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Bearing Washers

Bearing Washers

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

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.)