ISO Class 8.8 Washers | McMaster-Carr

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System of Measurement

Screw Size

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

Finish

Zinc Flake Coated

Material

Washer Type

OD

Specifications Met

Fastener Strength Rating

Washer Designation

General Purpose

Thickness

0.2 mm to 0.4 mm

0.4 mm to 0.6 mm

0.5 mm to 0.6 mm

0.7 mm to 0.9 mm

0.9 mm to 1.1 mm

1.0 mm to 1.4 mm

1.4 mm to 1.8 mm

1.8 mm to 2.2 mm

2.3 mm to 2.7 mm

2.6 mm to 4.6 mm

2.7 mm to 3.3 mm

3.2 mm to 5.5 mm

3.4 mm to 4.6 mm

3.6 mm to 6.0 mm

3.7 mm to 4.3 mm

Thread Size

Hardness

DFARS Specialty Metals

RoHS

Export Control Classification Number (ECCN)

REACH

Length

Thread Type

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

Performance

Corrosion Resistant

Tension Indicating

Application

Thread Pitch

Tension Indicated

Width

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89 Products

Washers

General Purpose Washers

General Purpose Washers

Your go-to metal washer for every screw size

Oversized Washers

Oversized Washers

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

Tension-Indicating Structural Washers

Tension-Indicating Structural Washers

Change color when you apply the correct tension to prevent overtightening

Undersized Washers

Undersized Washers

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

Other Products

Hex Head Screws

Hex Head Screws

Used with nuts to create a stronger joint than flat and rounded screws

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