Round Flat Washers | McMaster-Carr

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System of Measurement

ID

OD

Material

Stainless Steel

Screw Size

Thickness

0.001" to 0.003"

0.002" to 0.004"

0.004" to 0.006"

0.005" to 0.006"

0.005" to 0.024"

0.005" to 0.030"

0.008" to 0.012"

0.009" to 0.012"

Washer Type

Finish

Corrosion-Resistant Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Performance

Abrasion Resistant

Chemical Resistant

Corrosion Resistant

Electrically Insulating

Finish-Your-Own

Flame Retardant

High Temperature

Impact Resistant

Low Temperature

Moisture Resistant

Color

Shape

Hardness

Length

Specifications Met

Washer Designation

General Purpose

DFARS Specialty Metals

RoHS

Compliant with Exemptions

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

REACH

Export Control Classification Number (ECCN)

Thread Size

Shaft Diameter

ASME Designation

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

Sold As

Minimum Hardness

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8,475 Products

Fastening and Joining

Washers

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

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Insulating Washers

Insulating Washers

Isolate screws from electrical current and prevent corrosion from mating different metals

Shims

Align and space components on shafts, or level machinery, cabinets, and doors

Spacers

Unthreaded to create space between two surfaces or objects, often to align them

Power Transmission

Disc Springs

Maintain tension and separate components on shafts, under bolt heads, and at the ends of valves

Electrical

Electrical Enclosure Fasteners

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

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