1/2" Screw Size Washers | McMaster-Carr

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System of Measurement

Screw Size

Material

Garolite G-10/FR4

Stainless Steel

Washer Type

OD

Thickness

0.013" to 0.019"

0.014" to 0.016"

0.015" to 0.025"

0.017" to 0.023"

0.020" to 0.042"

0.021" to 0.041"

0.022" to 0.042"

0.025" to 0.035"

0.025" to 0.040"

0.026" to 0.036"

Finish

Corrosion-Resistant Coated

Nickel Chrome Plated

Phosphate Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

Performance

Abrasion Resistant

Chemical Resistant

Corrosion Resistant

Electrically Insulating

High Temperature

Impact Resistant

Low Temperature

Moisture Resistant

Washer Designation

General Purpose

Color

Specifications Met

ASME Designation

Length

Width

Hardness

Fastener Strength Rating

Shape

DFARS Specialty Metals

Military Specification

Army-Navy Specification

Military Specification

Maximum Temperature

Less than 250° F

250° F to 299° F

300° F to 499° F

500° F to 999° F

1,000° F or greater

RoHS

Compliant with Exemptions

REACH

Export Control Classification Number (ECCN)

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640 Products

Washers

General Purpose Washers

General Purpose Washers

Your go-to metal washer for every screw size

Oversized Washers

Oversized Washers

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

Mil. Spec. Washers

Mil. Spec. Washers

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

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

Washers for Square-Neck Bolts

Washers for Square-Neck Bolts

The square hole fits snugly around carriage, plow, and elevator bolts

Structural Washers

Structural Washers

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

Tension-Indicating Structural Washers

Tension-Indicating Structural Washers

Change color when you apply the correct tension to prevent overtightening

Plastic Washers

Plastic Washers

Lightweight, nonconductive, and naturally rust resistant

Mil. Spec. Plastic Washers

Mil. Spec. Plastic Washers

Meet U.S. military standards and are lightweight, nonconductive, and naturally rust resistant

Hard Fiber Washers

Hard Fiber Washers

Least likely to scratch delicate mounting surfaces

Fiberglass Washers

Fiberglass Washers

Best strength-to-weight ratio of all our nonmetal washers

Ultra-High-Temperature Ceramic Washers

Ultra-High-Temperature Ceramic Washers

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

Self-Retaining Washers

Self-Retaining Washers

Assemble screws and washers in advance to save time

Adhesive-Back Washers

Adhesive-Back Washers

Stick on your surface to prevent slipping while you fasten

Magnetic Washers

Magnetic Washers

Stay in place on iron and steel surfaces during installation

Easy-Install Slotted Washers

Easy-Install Slotted Washers

Slip under nuts and screws without having to disassemble them

Clipped Washers

Clipped Washers

Clipped on one side to fit in tight spots

Double-Clipped Washers

Double-Clipped Washers

Squeeze into tighter spots than single-clipped washers

Square Washers

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

Rectangular Washers

Rectangular Washers

Our narrowest washers to fit in thin channels, slots, and other tight spaces

Notched Washers

Notched Washers

Hammer nails into the notches to prevent rotation.

Beveled Washers

Beveled Washers

The thickest washers we offer, designed for heavy duty wood construction

Reinforcing Sleeve Washers

Reinforcing Sleeve Washers

Keep soft materials from collapsing into the hole

Dished Washers

Cover oversized holes, such as the ends of pipe and tubes

Other Products

Lock Washers

Resist vibration to prevent fasteners from loosening

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Leveling Washers

Leveling Washers

Curved or tapered to compensate for uneven mounting surfaces

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Spacers

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

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

Clamp Holding Washers

Clamp Holding Washers

Replace worn washers on open-arm toggle clamps to keep holding screws in place

Tie-Down Washers

Tie-Down Washers

Angled sides align and hold tie-down straps

Push Nuts

Press onto threads for a light duty hold that’s faster to install than typical nuts

Tag Washers

Bolt onto surfaces to mount tag rings and ties

Magnets

Attract or repel metal objects to hang, secure, or position them

Unthreaded Inserts

Unthreaded Inserts

Reinforce, align, and adjust joints as you tighten a fastener

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