Galvanized Steel Flat Washers | McMaster-Carr

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Finish

Material

System of Measurement

Screw Size

Washer Type

OD

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

ID

Performance

Corrosion Resistant

Tension Indicating

Weather Resistant

Thickness

0.020" to 0.024"

0.036" to 0.065"

0.051" to 0.080"

0.054" to 0.070"

0.056" to 0.071"

0.064" to 0.104"

0.065" to 0.100"

0.074" to 0.121"

0.080" to 0.120"

0.086" to 0.116"

0.086" to 0.132"

0.090" to 0.112"

Washer Designation

Application

Specifications Met

ASME Designation

Fastener Strength Rating

Width

DFARS Specialty Metals

Hardness

Color

RoHS

Compliant with Exemptions

REACH

Export Control Classification Number (ECCN)

Environment

Tension Indicated

Maximum Temperature

250° F to 499° F

Minimum Temperature

-49° F to -1° F

How can we improve?

223 Products

Washers

Structural Washers

Structural Washers

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

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

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

Tension-Indicating Structural Washers

Tension-Indicating Structural Washers

Change color when you apply the correct tension to prevent overtightening

Square Washers

Won't rotate as you fasten screws in slots and channels

Undersized Washers

Undersized Washers

Pair with fasteners that have narrow heads, such as cheese and socket head screws

Washers for Foam Insulation

Washers for Foam Insulation

Prevent screws from crushing insulation board

Perforated Washers

Perforated Washers

Plaster flows through to form a bond between the washer and wall

Other Products

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Lock Washers

Resist vibration to prevent fasteners from loosening

Strut Channel Framing and Fittings

Strut Channel Framing and Fittings

Secure fittings in the U-shaped channel to route conduit and pipe or build other structures

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