Seals | McMaster-Carr

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36,456 Products

Sealing

Shaft Seals

Prevent leaks in motors, pumps, and gearboxes

U-Cup Seals

With a lip on both the inside and outside edges, they can be used for sealing rods and pistons

Rod Wipers

Scrape dirt off rods to keep the inside of cylinders clean

Rod Seals

Maintain pressure inside cylinders and prevent fluid leaks

Piston Seals

Prevent leaks inside pistons by creating a seal against the cylinder bore

Spring-Loaded Seals

Spring-Loaded Seals

Seal rods and pistons with a wider range of temperature and chemical resistance than U-cup seals

Packing Seals

Fill in gaps around pump shafts, valve stems, and agitators to prevent leaks

Packing Seal Lubricating Rings

Packing Seal Lubricating Rings

Install between layers of packing seals to distribute lubricants evenly; also known as lantern rings

Buffering Seals

Buffering Seals

Protect hydraulic cylinders from pressure spikes and shock in high-pressure applications

Wear Rings

Guide rods and pistons to prevent uneven wear and extend the life of seals

Head Seals

Maintain a seal even under fluctuating pressure; more reliable than an O-ring with a backup ring

Cushioning Seals

Cushioning Seals

Reduce wear and noise in air-powered cylinders by blocking the piston from hitting the cylinder body

Shaft Repair Sleeves

Shaft Repair Sleeves

Cover worn shafts with a smooth and protective sealing surface without machining

Wear Ring Stock

Wear Ring Stock

Cut to make wear rings that fit any rod or bore to prevent uneven wear and extend the life of seals

Edge Seals

Block dust, water, and wind from entering the gaps around doors and windows

Rope Seals

Insulate the edges of oven, furnace, and boiler doors to keep heat in

O-Rings

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

10,684 products

O-Ring Cord Stock

O-Ring Cord Stock

Cut to length to create customized seals

Backup Rings

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

O-Ring Bonding Kits

O-Ring Bonding Kits

Everything needed to make O-rings

Tube Fitting Gaskets

Tube Fitting Gaskets

Prevent leaks when connecting sanitary tube fittings

Gasket Tape

Stick in place around doors, enclosures, and vents to create a leak-resistant seal

Gasket Material

Gasket Material

Cut custom shapes and sizes to fill gaps between flat surfaces

Hose Coupling Gaskets

Hose Coupling Gaskets

Form tight seals on cam-and-groove, grip-lock, and twist-claw hose connections

Pipe Gaskets

Form tight seals when connecting flanged pipe fittings

EMI/RFI Shielding Gaskets

EMI/RFI Shielding Gaskets

Fit around enclosure doors or data connectors to prevent inaccurate signals and flickering displays

Hose Washers

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

Gasket Makers

Seal irregular shapes and tiny crevices by applying a bead that hardens into a gasket

Pipe Flashings

Create watertight seals around vent pipes on roofs, even if they expand, contract, and vibrate

Boiler Gaskets

Resist heat and steam to form a leak-resistant seal around closures on boilers

Manway Gaskets

Create a tight seal between the nozzle and lid of tank car manways

Made-to-Order Gaskets

Made-to-Order Gaskets

Send your exact specifications to get gaskets that fit precisely between surfaces

Gasket Sealants

Gasket Sealants

Seal gaskets on metal parts

Drain Gaskets

Create a watertight seal between your drain and fixture without the mess of plumber's putty

Heat Exchanger Gaskets

Heat Exchanger Gaskets

Replace front and rear gaskets in shell and tube heat exchangers

Sealants

Fill and seal gaps in metal, plastic, wood, and other materials

Thread Sealants

Thread Sealants

Create a seal between threaded connections to prevent loosening from vibration

Caulk Gun Nozzles

Caulk Gun Nozzles

Attach to caulk guns to change the shape and amount of sealant that's dispensed

Caulk Guns

Cartridge, sausage-pack, and bulk-load caulk guns

Backer Rods

Insert into gaps before caulking to reduce how much sealant you need and improve adhesion

Backer Rod Insertion Tools

Backer Rod Insertion Tools

Quickly set foam backer rods in caulk joints at a consistent depth without puncturing them

Sealant Primers

Sealant Primers

Apply to surfaces before sealant to speed up drying times and improve adhesion

Raw Materials

Foam

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

Rubber

Compresses and bounces back to shape; often used for sealing, cushioning, and shock absorbing

Felt

Thicker and more absorbent than fabric for insulating, polishing, cushioning, and gasketing

Fabric

Use to cover, clean, and insulate objects

Mica

An electrical insulator that resists high temperatures; use in circuit breakers and heating elements

Pigments and Dyes

Pigments and Dyes

Add color to liquids, mixtures, and materials

Building and Machinery Hardware

Edge Trim

Install on panels, boards, signs, and mirrors to protect edges from impact

Grommets

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

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

Surface Guards

Protect walls and other flat surfaces from impact

Corner Guards

Shield corners on walls and other surfaces from impact

Panel Connecting Trim

Panel Connecting Trim

Connect two panels while protecting the edges from damage

Wall Bases

Protect the bottom of walls from foot traffic and impact

Weatherstripping

Weatherstripping

Seal gaps around doors, windows, and frames

Thresholds

Transition between flooring surfaces and reduce gaps between doors and floors

Door Drip Guards

Door Drip Guards

Divert rain and snow away from door openings

Protective Plugs

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

Protective Caps

Protective Caps

Cover holes at the end of pipe, conduit, and fittings to keep out debris

T-Slotted Framing and Fittings

T-Slotted Framing and Fittings

The most versatile system, attach fittings along the continuous slots to build virtually anything

Vibration-Damping Mounts

Vibration-Damping Mounts

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

Window Film

Apply to windows for privacy, insulation, less glare, and a lower chance of shattering

Cam Latch Covers

Cam Latch Covers

Seal off cam locks and latches so dust, dirt, and water don't get in

Fastening and Joining

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Insulating Washers

Insulating Washers

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

Fastener Assortments

Fastener Assortments

Stay prepared by keeping fasteners in common sizes and materials on hand

Spacers

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

Standoff Caps

Create a finished look on standoffs and protect them from dirt and debris

Quick-Release Pin Receptacles

Quick-Release Pin Receptacles

Secure quick-release pins when you don’t have a through hole

Quick-Release Pin Retaining Caps

Quick-Release Pin Retaining Caps

Hold quick-release pins in holes that are oversized or out of round

Retaining Rings

Retaining Rings

Hold components on a shaft

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

Adhesives

Bond surfaces together

Adhesive Primers

Adhesive Primers

Prepare surfaces before adding adhesives to improve bonding strength

Threadlockers

Coat threads on threaded fasteners to prevent loosening from impact and vibration

Retaining Compounds

Retaining Compounds

Fill gaps to bond shafts, bearings, press-fit assemblies, and other cylindrical metal parts

Adhesive Accelerators

Adhesive Accelerators

Speed up the time it takes adhesives to reach full strength

Glue Guns

Melt and dispense hot-melt glue

Tape

Bind, seal, and mark surfaces

Facility and Grounds Maintenance

Paint

Renew, enhance, protect, and change the color of surfaces

Surface Fillers

Surface Fillers

Repair chips, cracks, and tears in various surfaces

Protective Coatings

Protective Coatings

Shield surfaces from the surrounding environment

Wood Stain Pens

Wood Stain Pens

Touch up nicks and scratches on wood

Wood Stains

Refresh and protect the appearance of wood surfaces by staining and sealing them

Powder Coating Sprayers

Powder Coating Sprayers

Evenly apply powder coatings to small or large parts

Paint Primers

Extend the life of paint and coatings by preparing surfaces beforehand

Touch-Up Paint Pens

Touch-Up Paint Pens

Cover scratches in paint and coatings

Fabric Coatings

Fabric Coatings

Preserve the appearance of fabric by blocking liquids and UV rays

Leather Lubricants

Leather Lubricants

Extend the life of leather; also known as castor oil

Leather Conditioners

Leather Conditioners

Recondition, waterproof, and preserve leather; also known as neatsfoot oil

Protective Coating Primers

Protective Coating Primers

Prepare metal surfaces for powder coating

Toilet Sealing Rings

Toilet Sealing Rings

Prevent leaks where toilets mount to the floor or wall

Toilet Spuds

Connect wall-mount toilets to a flush valve

Toilet Tank-to-Bowl Gaskets

Toilet Tank-to-Bowl Gaskets

Create a tight seal between a toilet tank and bowl

Urinal Sealing Rings

Urinal Sealing Rings

Prevent leaks where urinals mount to the wall

Urinal Spuds

Connect wall-mount urinals to a flush valve

Urinal Flanges

Connect a urinal to your drainage system

Flush Valve Replacement Parts

Flush Valve Replacement Parts

Replace virtually any part in the most common flush valve brands

Drain Check Valves

Drain Check Valves

Prevent water damage by placing into floor drains to stop sewer back-ups

Floor Drain Trap Seals

Floor Drain Trap Seals

Stop sewer gases from escaping through rarely used floor drains if the P-trap dries out

Plumber's Putty

Plumber's Putty

Mold into a watertight, removable seal around faucets and drains

Drywall Tape

Apply to seams and corners before spreading drywall compound for a finished appearance

Sealant Removers

Sealant Removers

Clean sealant and caulk off tools and other surfaces

Roof Coatings

Form a water-resistant layer to restore and reinforce your roof

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

Fluid Handling

Tube and Tube Fittings

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

Pipe and Pipe Fittings

Pipe and Pipe Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases through your facility

Hose and Hose Fittings

Hose and Hose Fittings

Flexible and stronger than tubing; often used to convey liquids and gases under pressure

Expansion Plugs

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

Valve Repair Kits

Valve Repair Kits

Maintain valves with replacement parts such as seals, plungers, and springs

Bore Sealing Plugs

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

Pressure Test Fittings

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

Gauge Guards

Shield gauges from corrosive liquids and gases; also called diaphragm seals

Strainers

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

Thermal Paste

Mold heat cable to pipe, eliminating air gaps that lead to heat loss and heater failure

Communication

Tamper-Evident Seals

Tamper-Evident Seals

Secure hasps, latches, and other connections to visibly indicate tampering

Material Handling

Conveyor Brushes

Conveyor Brushes

Position items on conveyor belts and wipe off debris

Conveyor Brush Holders

Conveyor Brush Holders

Mount conveyor brushes at point of use

Screw Conveyors

Screw Conveyors

Push material through fixed troughs

Conveyor Guides

Conveyor Guides

Direct and position items on conveyors while keeping them from falling off

Conveyor Guide Mounting Rod Caps

Conveyor Guide Mounting Rod Caps

Cover the ends of conveyor guide mounting rods for a finished look

Strapping Seals

Strapping Seals

Crimp onto strapping to keep it under tension

Strapping Buckles

Strapping Buckles

Hold strapping in light duty and low-tension applications

Strapping Sealers

Strapping Sealers

Crimp clips onto strapping to hold it tight

Shipping Pails

Ship up to 12 gallons of hazardous liquids or solids

Shipping Jugs

Ship up to seven gallons of hazardous liquids and dispense with control through the narrow opening

Inner Tubes

Pair with a matching tire for a smooth ride

Tire Sealants

Prevent tire punctures or plug them on the spot

Tire Repair Kits

Tire Repair Kits

Temporarily patch holes in leaking tires

Dock Door Seals

Dock Door Seals

Close the gap between dock doors and trailers to keep heated or cooled air in and dust out

Dock Door Shelters

Dock Door Shelters

Wrap around trailers where they meet dock doors to shield out the elements better than seals

Dock Bumpers

Prevent damage to docks and vehicles by absorbing impacts

Electrical

Manual Switches

Manual Switches

Everything from toggle, push-button, and rocker switches to foot switches

Manual Switch Covers

Manual Switch Covers

Completely cover switches to protect them from moisture and dust

Manual Switch Seals

Manual Switch Seals

Seal dust and moisture out of switches while leaving the toggle exposed

Potentiometer Panel Seals

Potentiometer Panel Seals

Keep moisture and dust out of potentiometers

Wire Sleeving

Bundle wiring and protect from abrasion and heat

Electrical Enclosure Plugs

Electrical Enclosure Plugs

Cover unused holes in enclosures to keep out dust, dirt, and moisture

Conformal Coatings

Conformal Coatings

Secure and insulate components on circuit boards and other electronics

Heat-Shrink Tubing

Heat-Shrink Tubing

Apply heat to seal and insulate electrical wiring and connections

Potting Compounds

Potting Compounds

Encase electronic assemblies in material that hardens to protect from dust, moisture, and vibration

Solder Mask

Temporarily shield circuit boards from solder, flux, and high temperatures

DIN Rail Caps

Guard the edges of DIN rail from damage and create a finished look

Thermal Interface Material

Thermal Interface Material

Dissipate heat away from electronic components

Data Port Locks

Data Port Locks

Block USB or Ethernet ports from unauthorized use

Capacitor Boots

Capacitor Boots

Shield capacitors and wire connections to extend their service life and reduce accidental shocks

Power Transmission

Hydraulic Cylinder Seals

Hydraulic Cylinder Seals

Replace seals on the piston or rod end of hydraulic cylinders

Cylinder Rod Glands

Cylinder Rod Glands

Replace the rod gland on hydraulic cylinders

Compressed Air Filter Seals

Compressed Air Filter Seals

Replace O-rings in compressed air filters

Rod End Seals

Keep dirt out and lubrication in to extend the life of rod ends

Springs

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

Heating, Ventilation, and Air Conditioning

Spray Foam Insulation

Spray Foam Insulation

Expands to fill in cracks, gaps, and other hollow spaces for a tight seal against drafts and heat

Pipe Insulation

Pipe Insulation

Fit around pipe, tubing, and tanks to reduce heat loss or condensation

Foam Insulation Coatings

Foam Insulation Coatings

Shield foam pipe insulation from moisture, UV rays, and ozone

Insulation Fill

Insulation Fill

Blow into walls to fill gaps in existing insulation, or mix as a filler in insulating cement

Chimney Pipe and Fittings

Chimney Pipe and Fittings

Exhaust hot air and fumes from boilers, furnaces, and stoves

Air Conditioner Service Valve Caps

Air Conditioner Service Valve Caps

Seal off AC service valves to prevent refrigerant from leaking out

Fabricating and Machining

Zinc-Plating Kits

Zinc-Plating Kits

Create your own zinc-plating system to add corrosion resistance to steel and iron parts

Anodizing Kits

Coat aluminum parts for added resistance to corrosion and chemicals

Blackener Kits

Create a flat, black protective finish on metal tools to resist corrosion and reduce glare

Fixture Plate Plugs

Fixture Plate Plugs

Keep chips and shavings from clogging or damaging unused holes on fixture plates in milling machines

Safety Equipment

Bearing Guards

Shield bearings from dirt, and protect fingers and tools from moving parts

Fire Stops

Prevent fire and smoke from passing through holes in fire-resistant walls and floors

Electrical Protection Blankets

Electrical Protection Blankets

Wrap around power lines and electrical equipment to shield workers from high voltage

Drum Patches

Patch drum leaks to prevent their contents from spilling

Containers, Storage, and Furniture

Tank Patches

Spin with a handheld electric router to seal holes in plastic tanks and containers

Dust Covers

Stretch over drums, pails, and other objects to keep out dust and debris

Stacking Caps and Targets

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

Measuring and Inspecting

O-Ring Gauges

Identify the size of your O-ring

Leak-Detecting Dyes

Leak-Detecting Dyes

Bright colors help you spot leaks in water and hydraulic systems without using ultraviolet light

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