ASME B18.21.1 Washers | McMaster-Carr

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System of Measurement

Screw Size

Material

Stainless Steel

Washer Type

OD

Finish

Corrosion-Resistant Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

ID

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

Thickness

0.010" to 0.013"

0.010" to 0.015"

0.010" to 0.016"

0.012" to 0.018"

0.014" to 0.018"

0.014" to 0.020"

0.015" to 0.019"

0.016" to 0.018"

0.016" to 0.021"

0.016" to 0.022"

0.016" to 0.025"

0.017" to 0.021"

0.018" to 0.023"

0.018" to 0.024"

0.020" to 0.025"

0.020" to 0.027"

0.020" to 0.060"

Washer Designation

General Purpose

Performance

Chemical Resistant

Corrosion Resistant

Electrically Insulating

High Temperature

Impact Resistant

Moisture Resistant

ASME Designation

DFARS Specialty Metals

Color

Fastener Strength Rating

Hardness

Rockwell C40 to Rockwell C50

Military Specification

Army-Navy Specification

Military Specification

RoHS

Compliant with Exemptions

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

REACH

Certificate Type

Material Certificate with Traceable Lot Number

Material Certificate with Traceable Lot Number and Test Report

Tooth Location

Internal and External

Certification

Export Control Classification Number (ECCN)

Passivation

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Fastening and Joining

Washers

Nearly every size and shape imaginable, from flat washers to clipped to curved

Lock Washers

Resist vibration to prevent fasteners from loosening

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