Rigid Insulation Washers | McMaster-Carr

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For Use With

Foam Insulation

Conduit Type

System of Measurement

Screw Size

Material

Garolite G-10/FR4

OD

ID

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"

Finish

Black Zinc Plated

Chlorine Treated

Chromate Conversion Coated

Corrosion-Resistant Coated

Hot-Dipped Galvanized

Nickel Chrome Plated

Performance

Abrasion Resistant

Adjustable Flow

Adjustable Length

Aggressive Cleaning

Chemical Resistant

Corrosion Resistant

Create-Your-Own

Crush Resistant

Washer Designation

General Purpose

Thread Size

Fastener Strength Grade/Class

ASTM Grade A325

ASTM Grade A490

Specifications Met

CSA C22.2 No. 68

EPA Compliant 40 CFR 141

NEBS GR-63-CORE

Shaft Diameter

Color

Screen Material

304 Stainless Steel

Stainless Steel

Length

Hardness

Shape

DFARS Specialty Metals

RoHS

Compliant with Exemptions

REACH

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

Export Control Classification Number (ECCN)

How can we improve?

44,839 Products

Washers

General Purpose Washers

General Purpose Washers

Your go-to metal washer for every screw size

Mil. Spec. Washers

Mil. Spec. Washers

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

Oversized Washers

Oversized Washers

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

Plastic Washers

Plastic Washers

Lightweight, nonconductive, and naturally rust resistant

SAE Washers

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

ASME Washers

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

USS Washers

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

Undersized Washers

Undersized Washers

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

Structural Washers

Structural Washers

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

Self-Retaining Washers

Self-Retaining Washers

Assemble screws and washers in advance to save time

Mil. Spec. Plastic Washers

Mil. Spec. Plastic Washers

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

Clipped Washers

Clipped Washers

Clipped on one side to fit in tight spots

Hard Fiber Washers

Hard Fiber Washers

Least likely to scratch delicate mounting surfaces

Square Washers

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

Fiberglass Washers

Fiberglass Washers

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

Adhesive-Back Washers

Adhesive-Back Washers

Stick on your surface to prevent slipping while you fasten

Ultra-High-Temperature Ceramic Washers

Ultra-High-Temperature Ceramic Washers

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

Tension-Indicating Structural Washers

Tension-Indicating Structural Washers

Change color when you apply the correct tension to prevent overtightening

Reinforcing Sleeve Washers

Reinforcing Sleeve Washers

Keep soft materials from collapsing into the hole

Easy-Install Slotted Washers

Easy-Install Slotted Washers

Slip under nuts and screws without having to disassemble them

Rectangular Washers

Rectangular Washers

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

Washers for Square-Neck Bolts

Washers for Square-Neck Bolts

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

Dished Washers

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

Double-Clipped Washers

Double-Clipped Washers

Squeeze into tighter spots than single-clipped washers

Beveled Washers

Beveled Washers

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

Plastic Washer Assortments

Plastic Washer Assortments

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

Finish-Your-Own Washers

Finish-Your-Own Washers

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

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

Washers for Blind Rivets

Washers for Blind Rivets

Sized to fit around blind rivet diameters

Washers for Foam Insulation

Washers for Foam Insulation

Prevent screws from crushing insulation board

General Purpose Washer Assortments

General Purpose Washer Assortments

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

Curved Washers

Sit flush against rails, columns, and other structural tubes

Notched Washers

Notched Washers

Hammer nails into the notches to prevent rotation.

Perforated Washers

Perforated Washers

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

Magnetic Washers

Magnetic Washers

Stay in place on iron and steel surfaces during installation

USS Washer Assortments

USS Washer Assortments

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

SAE Washer Assortments

SAE Washer Assortments

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

Oversized Washer Assortments

Oversized Washer Assortments

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

Square Washers for Blind Rivets

Square Washers for Blind Rivets

Won't rotate as you fasten blind rivets in slots and channels

Other Products

Lock Washers

Resist vibration to prevent fasteners from loosening

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

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

Thrust Bearings

Thrust Bearings

Support loads parallel to the shaft with plain, ball, or roller bearings

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

Spacers

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

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Disc Springs

Maintain tension and separate components on shafts, under bolt heads, and at the ends of valves

O-Rings

Fit snugly into a groove between parts to create a leak-resistant seal

13,722 products

Bearing Lock Washers

Bearing Lock Washers

Lock bearing nuts in place to prevent loosening due to vibration

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

Hose Washers

Place inside nozzles and spigots to prevent leaks in an attached hose

Retaining Rings

Retaining Rings

Hold components on a shaft

Thrust Roller Bearing Washers

Thrust Roller Bearing Washers

Adapt needle-roller thrust bearings for use on unhardened, unground surfaces

Magnets

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

Cross-Bracing Washers

Cross-Bracing Washers

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

Backup Rings

Extend the life of O-rings and improve their performance under high pressure

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

Battery-Terminal Washers

Battery-Terminal Washers

Stop battery acid fumes from corroding terminal posts

Push Nuts

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

Foam

Pockets of air make it lighter in weight than rubber; good for packing, insulating, and sealing

Tube Fitting Rings

Tube Fitting Rings

Snap onto push-to-connect fittings to identify different tubing lines

Clamp Holding Washers

Clamp Holding Washers

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

Clothes Washers

Clothes Washers

Load clothes in the top and choose from five washing cycles

Tag Washers

Bolt onto surfaces to mount tag rings and ties

Faucet Washers

Seal faucet components so they don’t leak

Tie-Down Washers

Tie-Down Washers

Angled sides align and hold tie-down straps

Conduit Reducing Washers

Conduit Reducing Washers

Shrink knockout sizes in outlet boxes or enclosures to connect smaller conduit

Hex Head Screws

Hex Head Screws

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

Clothes Dryers

Load clothes to dry them at a heavy duty, normal, or delicate level

Snap-In Nuts

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

Electrical-Terminal Washers

Electrical-Terminal Washers

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

Shaft Seals

Prevent leaks in motors, pumps, and gearboxes

Vibration-Damping Mounts

Vibration-Damping Mounts

Attach to machinery to reduce vibration and noise and extend service life

Fastener Assortments

Fastener Assortments

Keep a variety of common screws, nuts, and washers on hand

Lead

A dense insulator often used to shield against radiation and absorb sound and vibration

Air Nozzles

Blow concentrated air for cleaning, drying, cooling, and ejecting parts

Scouring Pads

Scrub heavy grease and grime away better than sponges

Unthreaded Inserts

Unthreaded Inserts

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

Shoe Washing Stations

Shoe Washing Stations

Sanitize your shoes before entering a clean room or food processing plant

Captive Panel Screws

Captive Panel Screws

Secure panels and enclosures while still having access to them

Socket Retaining Rings

Socket Retaining Rings

Secure sockets and adapters to impact tools

Blowguns

Direct a stream of air to clean equipment, parts, and spaces

Tag Rings

Loop onto tags to attach them to lanyards, key rings, and other objects

Parts Baskets

Contain parts for cleaning and moving them in and out of washers

Water Brooms

Hook up to a garden hose and roll to wash floors, driveways, and other flat surfaces

Pressure Washer Extension Wands

Pressure Washer Extension Wands

Connect to your pressure washer to spray down hard-to-reach areas

Protective Caps

Protective Caps

Protect just about anything, including pipe, flanges, screws, and posts

Cup and End Brushes

Cup and End Brushes

Attach to a power tool to clean flat, curved, and irregular surfaces

Tube Brushes

Remove contaminants from tubes, pipes, and holes

Parts Washing Brushes

Parts Washing Brushes

Use alone or connect to a parts washer to apply solution and scrub away dirt, grease, and rust

Brooms

Sweep up dust, dirt, and other debris

Parts Washers

Pump solution through a spigot or hose to clean parts in the basin

Electrical Enclosure Fasteners

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

Toilet Sealing Rings

Toilet Sealing Rings

Prevent leaks where toilets mount to the floor or wall

Glassware Rinsers

Glassware Rinsers

Rinse the inside of glasses, tubes, or beakers with a simple press

Hand Brushes

Clean dust and chips off tables and workbenches

Wheel Brushes

Bristles on the edge of the wheel clean, sand, and debur targeted areas

Scrub Brushes

Everyday scrub brushes, scrub brushes with a handle, and drill-operated scrub brushes

Pipette Washers

Pipette Washers

Connect to a water supply to rinse large numbers of pipettes efficiently and safely

Sink Drain Fitting Washers

Sink Drain Fitting Washers

Replace the washers in sink drain fittings

Garden Hose Nozzles

Garden Hose Nozzles

Control the flow from a garden hose for spraying and washing

Cord Stock

Cut to length to create customized seals

Swabs

Cotton, clean room, antistatic, sterile, and wet swabs

Squeegees

Wipe liquids off of windows, floors and other surfaces

Pressure Washers

Pressure Washers

Turn water from a garden hose into a high-pressure blast to power away tough dirt and grime

Air Knives

Create a sheet of high-velocity air that dries, cleans, and cools parts and equipment

Hand Washing Stations

Hand Washing Stations

Clean your hands in remote places like worksites or before entering sanitary environments

Abrasive Hand Brushes

Abrasive Hand Brushes

Manually scrub to remove rust, stains, small burs, and other contaminants

Air Knife Positioning Arms

Air Knife Positioning Arms

Two swiveling joints move your air knife and direct airflow

Wash Gun Nozzle Extensions

Wash Gun Nozzle Extensions

Attach to your wash gun nozzle to clean places out of arm's reach

Air Knife Mounting Brackets

Air Knife Mounting Brackets

Mate with the end of air knife positioning arms to attach air knives

O-Ring Gauges

Identify the size of your O-ring

Siphon Guns

Spray liquid and air at the same time to produce a mist of liquids or chemicals

Strainers

Install next to valves and pumps to catch debris in your line

Wash Guns

Fasten to a hose to control water flow during washdowns

Ultrasonic Cleaners

Ultrasonic Cleaners

Sound waves agitate solution to remove contaminants from instruments, beakers, and other small parts

Nozzle Tip Cleaners

Nozzle Tip Cleaners

Clear out residue from small openings, such as nozzles or torch tips

Submersible Pumps

Submersible Pumps

Circulate liquids in small tanks, cooling baths, and other low-flow applications

Linear Wave Springs

Linear Wave Springs

Absorb vibration and fill in gaps along the length of an object

Parts Washer Filters

Parts Washer Filters

Change out used filters or catch grease, oil, and debris to extend the life of your solution

Air Nozzle Swivels

Air Nozzle Swivels

Adjust airflow angle when you can’t move the nozzle

Floor Machine Brushes

Floor Machine Brushes

Use with a floor machine to scrub floors; more durable than floor machine pads

Pressure Washer Guns

Pressure Washer Guns

Control the flow of water sprayed from a pressure washer

Parts Washing Solutions

Parts Washing Solutions

Add to parts washers to remove dirt, oil, grease, rust, and other contaminants

Parts Washing Cans

Parts Washing Cans

Save space and solution when cleaning small parts or just a few items

Cleaning Solutions for Ultrasonic Cleaners

Cleaning Solutions for Ultrasonic Cleaners

Remove contaminants from parts in ultrasonic cleaners

Window Washer Pads

Window Washer Pads

Replace window washer heads

Sander Cleaners

Sander Cleaners

Extend the life of sanding belts, rolls, discs, and sheets by removing residue

Floor Machines

Strip, scrub, buff, and polish hard or carpeted floors with a pad or brush

Disinfecting Solutions for Ultrasonic Cleaners

Disinfecting Solutions for Ultrasonic Cleaners

Eliminate bacteria and germs while cleaning parts in ultrasonic cleaners

Parts Washer Replacement Parts

Parts Washer Replacement Parts

Replace parts such as pumps, hose, and fusible links

O-Ring Bonding Kits

O-Ring Bonding Kits

Everything needed to make O-rings

Parts Washing Tubs

Parts Washing Tubs

Fill with solution to soak and clean parts

Rinsing Solutions for Ultrasonic Cleaners

Rinsing Solutions for Ultrasonic Cleaners

Dissolve residue that solvent-based cleaning solutions can leave behind

Heat-Shrink Tubing

Heat-Shrink Tubing

Apply heat to seal and insulate electrical wiring and connections

Pipe Cleaners

Clean small holes and inside tubes with these flexible brushes

Parts Cleaning Vacuum/Blowers

Parts Cleaning Vacuum/Blowers

Blast coolant, oil, and chips off your parts while a vacuum draws them into a drum

Toilet Brushes

Scrub out toilet bowls

Parts Cleaning Vacuum/Blower Filters

Parts Cleaning Vacuum/Blower Filters

Replace the filter in parts cleaning vacuum/blowers

File Cleaners

Clear metal shavings and debris from file teeth; also known as file cards

Urinal Sealing Rings

Urinal Sealing Rings

Prevent leaks where urinals mount to the wall

Window Washers

Attach to a pole handle to clean high window panes

Dipping Racks

Hang items during painting, cleaning, and drying

Electropolishers

Electropolishers

Dissolve microscopic surface flaws from metal parts for a mirror-like finish

Electropolishing Solutions

Electropolishing Solutions

Smooth, brighten, and passivate metal parts for a mirror-like finish

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