Type B Flat Washers | McMaster-Carr

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Specifications Met

ASTM F436 Type 1

Screw Size

Material

Stainless Steel

Washer Type

Finish

Corrosion-Resistant Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

OD

ID

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

Thickness

0.016" to 0.025"

0.020" to 0.060"

0.022" to 0.028"

0.025" to 0.040"

0.026" to 0.046"

0.028" to 0.036"

0.029" to 0.035"

0.036" to 0.045"

0.036" to 0.065"

0.038" to 0.048"

System of Measurement

Washer Designation

General Purpose

ASME Designation

Performance

Chemical Resistant

Corrosion Resistant

Electrically Insulating

High Temperature

Impact Resistant

Moisture Resistant

Fastener Strength Rating

Color

DFARS Specialty Metals

Military Specification

Army-Navy Specification

Military Specification

RoHS

Compliant with Exemptions

REACH

Export Control Classification Number (ECCN)

Certification

Passivation

Certificate Type

Material Certificate with Traceable Lot Number

Material Certificate with Traceable Lot Number and Test Report

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

Minimum Temperature

-99° F to -50° F

-49° F to -1° F

How can we improve?

1,323 Products

Washers

General Purpose Washers

General Purpose Washers

Your go-to metal washer for every screw size

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

Mil. Spec. Washers

Mil. Spec. Washers

Adhere to U.S. military standards for material and construction

Plastic Washers

Plastic Washers

Lightweight, nonconductive, and naturally rust resistant

Structural Washers

Structural Washers

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

Ultra-High-Temperature Ceramic Washers

Ultra-High-Temperature Ceramic Washers

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

Oversized Washers

Oversized Washers

Exaggerated diameters and thicknesses to cover large holes or to create gaps

Hard Fiber Washers

Hard Fiber Washers

Least likely to scratch delicate mounting surfaces

Other Products

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.)