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

DFARS Specialty Metals

ASME Designation

Color

Fastener Strength Rating

Hardness

Rockwell C40 to Rockwell C50

RoHS

Compliant with Exemptions

Military Specification

Army-Navy Specification

Military Specification

Certification

REACH

Tooth Location

Internal and External

Certificate Type

Material Certificate with Traceable Lot Number

Material Certificate with Traceable Lot Number and Test Report

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

Export Control Classification Number (ECCN)

Passivation

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1,526 Products

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.)