M20 Washers | McMaster-Carr

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System of Measurement

Screw Size

Material

Stainless Steel

Washer Type

ID

OD

Thickness

0.094" to 0.156"

0.110" to 0.130"

0.120" to 0.140"

0.220" to 0.230"

Finish

Corrosion-Resistant Coated

Phosphate Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Specifications Met

Fastener Strength Grade/Class

Hardness

Washer Designation

General Purpose

Color

Performance

Abrasion Resistant

Chemical Resistant

Corrosion Resistant

Electrically Insulating

High Temperature

Impact Resistant

Moisture Resistant

Precision Adjust

Length

ASME Designation

Fastener Strength Rating

DFARS Specialty Metals

RoHS

Compliant with Exemptions

REACH

Export Control Classification Number (ECCN)

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

Overall Height

Width

Shape

Minimum Temperature

-99° F to -50° F

-49° F to 0° F

How can we improve?

152 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

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

Leveling Washers

Leveling Washers

Curved or tapered to compensate for uneven mounting surfaces

Bearing Lock Washers

Bearing Lock Washers

Lock bearing nuts in place to prevent loosening due to vibration

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

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