Metric Flat Washers | McMaster-Carr

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System of Measurement

Screw Size

Material

Stainless Steel

Washer Type

OD

ID

Thickness

0.2 mm to 0.3 mm

0.2 mm to 0.4 mm

0.203 mm to 0.508 mm

0.3 mm to 0.4 mm

0.3 mm to 0.5 mm

0.4 mm to 0.6 mm

0.5 mm to 0.6 mm

0.5 mm to 0.7 mm

0.5 mm to 1.1 mm

0.6 mm to 0.9 mm

Finish

Corrosion-Resistant Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Specifications Met

Washer Designation

General Purpose

Fastener Strength Grade/Class

Performance

Abrasion Resistant

Chemical Resistant

Corrosion Resistant

Electrically Insulating

Extreme Vibration Resistant

Finish-Your-Own

High Temperature

Impact Resistant

Moisture Resistant

ASME Designation

Color

Overall Height

Thread Size

Hardness

Shaft Diameter

RoHS

Compliant with Exemptions

REACH

DFARS Specialty Metals

Shape

Export Control Classification Number (ECCN)

Fastener Strength Rating

Maximum Temperature

Less than 200° F

200° F to 249° F

250° F to 499° F

500° F to 999° F

1,000° F or greater

Adhesive Thickness

How can we improve?

3,022 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

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

Tension-Indicating Structural Washers

Tension-Indicating Structural Washers

Change color when you apply the correct tension to prevent overtightening

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

Finish-Your-Own Washers

Finish-Your-Own Washers

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

Self-Retaining Washers

Self-Retaining Washers

Assemble screws and washers in advance to save time

Adhesive-Back Washers

Adhesive-Back Washers

Stick on your surface to prevent slipping while you fasten

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

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

Other Products

Lock Washers

Resist vibration to prevent fasteners from loosening

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

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

Bearing Washers

Bearing Washers

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

Fastener Assortments

Fastener Assortments

Stay prepared by keeping fasteners in common sizes and materials on hand

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Grommets

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

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