No. 4 Washers | McMaster-Carr

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Product Family

Cushioning Washers

Finishing Washers

Insulating Washers

Leveling Washers

Sealing Washers

Unthreaded Inserts

System of Measurement

Screw Size

Material

Garolite G-10/FR4

Grade 2 Titanium

Stainless Steel

OD

ID

Thickness

0.001" to 0.003"

0.002" to 0.004"

0.005" to 0.006"

0.008" to 0.012"

0.010" to 0.020"

0.012" to 0.018"

0.013" to 0.019"

0.014" to 0.016"

0.014" to 0.018"

0.015" to 0.017"

0.015" to 0.018"

0.015" to 0.019"

0.016" to 0.018"

Washer Type

Specifications Met

Finish

Corrosion-Resistant Coated

Phosphate Coated

Zinc Yellow-Chromate Plated

Certification

Military Specification

Army-Navy Specification

Military Specification

Performance

Chemical Resistant

Corrosion Resistant

Electrical Insulating

Flame Retardant

Heavy Vibration Resistant

High Temperature

Impact Resistant

Low Temperature

Moisture Resistant

DFARS Specialty Metals

Certificate Type

Material Certificate with Traceable Lot Number

Color

Passivation

Washer Designation

General Purpose

RoHS

Compliant with Exemptions

Length

REACH

Shape

Overall Height

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

Tooth Location

Internal and External

Hardness

Export Control Classification Number (ECCN)

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599 Products

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Washers

Mil. Spec. Washers

Mil. Spec. Washers

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

General Purpose Washers

General Purpose Washers

Your go-to metal washer for every screw size

Plastic Washers

Plastic Washers

Lightweight, nonconductive, and naturally rust resistant

Oversized Washers

Oversized Washers

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

Self-Retaining Washers

Self-Retaining Washers

Assemble screws and washers in advance to save time

ASME Washers

Meet ASME standards and come in regular, narrow, and wide diameters

SAE Washers

Meet SAE sizing standards and typically have smaller diameters than USS washers

Mil. Spec. Plastic Washers

Mil. Spec. Plastic Washers

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

Dished Washers

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

Rectangular Washers

Rectangular Washers

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

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

Clipped Washers

Clipped Washers

Clipped on one side to fit in tight spots

Ultra-High-Temperature Ceramic Washers

Ultra-High-Temperature Ceramic Washers

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

Easy-Install Slotted Washers

Easy-Install Slotted Washers

Slip under nuts and screws without having to disassemble them

Extra-High-Temperature Mica Washers

Extra-High-Temperature Mica Washers

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

Double-Clipped Washers

Double-Clipped Washers

Squeeze into tighter spots than single-clipped washers

Adhesive-Back Washers

Adhesive-Back Washers

Stick on your surface to prevent slipping while you fasten

Square Washers

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

Magnetic Washers

Magnetic Washers

Stay in place on iron and steel surfaces during installation

Other Products

Lock Washers

Resist vibration to prevent fasteners from loosening

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Insulating Washers

Insulating Washers

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

Spacers

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

Finishing Washers

Finishing Washers

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

Shims

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

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

Magnets

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

Tag Washers

Bolt onto surfaces to mount tag rings and ties

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

Snap-In Nuts

Push into square holes in thin materials to add bolts for aligning off-center parts

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