Acme Washers | McMaster-Carr

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System of Measurement

Screw Size

ID

OD

Material

Garolite G-10/FR4

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"

Washer Type

Length

Finish

Black Zinc Plated

Corrosion-Resistant Coated

Nickel Chrome Plated

Phosphate Coated

Shape

Color

Shaft Diameter

Specifications Met

DFARS Specialty Metals

RoHS

Compliant with Exemptions

REACH

Performance

Abrasion Resistant

Chemical Resistant

Corrosion Resistant

Electrically Insulating

Finish-Your-Own

High Temperature

Impact Resistant

Low Temperature

Moisture Resistant

Export Control Classification Number (ECCN)

Hardness

Thread Size

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

Washer Designation

General Purpose

Overall Height

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

Hole Diameter

0.221" to 0.224"

0.245" to 0.248"

0.256" to 0.259"

0.259" to 0.263"

0.269" to 0.272"

0.281" to 0.284"

0.299" to 0.303"

0.305" to 0.308"

ASME Designation

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17,781 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

Undersized Washers

Undersized Washers

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

Washers for Blind Rivets

Washers for Blind Rivets

Sized to fit around blind rivet 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

Very-High-Temperature Mica Washers

Very-High-Temperature Mica Washers

Won't melt, stick, or become brittle, even when exposed to temperatures as high as 1050° F

Ultra-High-Temperature Ceramic Washers

Ultra-High-Temperature Ceramic Washers

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

Finish-Your-Own Washers

Finish-Your-Own Washers

Punch a hole to create a custom inner diameter for uncommon screw sizes

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

General Purpose Washer Assortments

General Purpose Washer Assortments

A collection of common washer sizes to fit the broadest range of applications

Oversized Washer Assortments

Oversized Washer Assortments

A collection of exaggerated sizes to cover large holes or to create gaps

SAE Washer Assortments

SAE Washer Assortments

A range of sizes that meet SAE standards—typically have smaller diameters than USS washers

USS Washer Assortments

USS Washer Assortments

A collection of sizes that meet USS specifications—typically larger diameters than SAE washers

Plastic Washer Assortments

Plastic Washer Assortments

A selection of lightweight, nonconductive, and naturally rust-resistant washers

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

Square Washers for Blind Rivets

Square Washers for Blind Rivets

Won't rotate as you fasten blind rivets 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

Curved Washers

Sit flush against rails, columns, and other structural tubes

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

Lock Washers

Resist vibration to prevent fasteners from loosening

Spacers

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

Springs

Apply and absorb force with compression, die, extension, torsion, and disc springs

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Leveling Washers

Leveling Washers

Curved or tapered to compensate for uneven mounting surfaces

Cross-Bracing Washers

Cross-Bracing Washers

Connect cross-bracing rods or cables to structural beams; also known as hillside washers

Tie-Down Washers

Tie-Down Washers

Angled sides align and hold tie-down straps

Shims

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

Insulating Washers

Insulating Washers

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

Finishing Washers

Finishing Washers

Screw heads sit flush to prevent snagging and to create a neat, finished appearance

Bearing Lock Washers

Bearing Lock Washers

Lock bearing nuts in place to prevent loosening due to vibration

Unthreaded Inserts

Unthreaded Inserts

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

Push Nuts

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

Clamp Holding Washers

Clamp Holding Washers

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

Electrical-Terminal Washers

Electrical-Terminal Washers

Prevent wires from slipping out from under screw heads to keep electrical connections intact

Battery-Terminal Washers

Battery-Terminal Washers

Stop battery acid fumes from corroding terminal posts

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