Seal Materials | McMaster-Carr

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50,745 Products

Most Likely Products

Rubber

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

4,418 products

Edge Seals

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

524 products

Foam

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

2,686 products

Gasket Material

Cut custom shapes and sizes to fill gaps between flat surfaces

691 products

O-Ring Cord Stock

Cut to length to create customized seals

295 products

All Results

Sealing

Edge Seals

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

524 products

Rope Seals

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

135 products

Gasket Material

Cut custom shapes and sizes to fill gaps between flat surfaces

691 products

Manway Gaskets

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

8 products

Gasket Tape

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

58 products

Pipe Gaskets

Form tight seals when connecting flanged pipe fittings

1,399 products

Tube Fitting Gaskets

Prevent leaks when connecting sanitary tube fittings

428 products

Hose Washers

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

12 products

EMI/RFI Shielding Gaskets

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

115 products

Pipe Flashings

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

13 products

Made-to-Order Gaskets

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

16 products

Gasket Makers

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

61 products

Boiler Gaskets

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

44 products

Hose Coupling Gaskets

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

94 products

Heat Exchanger Gaskets

Replace front and rear gaskets in shell and tube heat exchangers

23 products

Gasket Sealants

Seal gaskets on metal parts

7 products

Drain Gaskets

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

3 products

O-Ring Cord Stock

Cut to length to create customized seals

295 products

Backup Rings

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

263 products

O-Rings

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

10,708 products

O-Ring Bonding Kits

Everything needed to make O-rings

7 products

Packing Seals

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

231 products

Packing Seal Lubricating Rings

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

8 products

Rod Wipers

Scrape dirt off rods to keep the inside of cylinders clean

109 products

Wear Ring Stock

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

12 products

Spring-Loaded Seals

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

54 products

Cushioning Seals

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

5 products

Head Seals

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

11 products

Shaft Seals

Prevent leaks in motors, pumps, and gearboxes

533 products

Wear Rings

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

54 products

U-Cup Seals

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

198 products

Shaft Repair Sleeves

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

21 products

Piston Seals

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

57 products

Rod Seals

Maintain pressure inside cylinders and prevent fluid leaks

50 products

Buffering Seals

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

22 products

Thread Sealants

Create a seal between threaded connections to prevent loosening from vibration

181 products

Sealants

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

246 products

Caulk Guns

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

40 products

Backer Rods

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

35 products

Caulk Gun Nozzles

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

12 products

Sealant Primers

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

9 products

Backer Rod Insertion Tools

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

2 products

Raw Materials

Rubber

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

4,418 products

Foam

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

2,686 products

Plastic

A lightweight alternative to metal and glass

9,099 products

Felt

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

919 products

Fabric

Use to cover, clean, and insulate objects

213 products

Ceramic

Hard and wear resistant, it also withstands corrosion and high temperatures

710 products

Mica

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

57 products

Leather

Durable and long lasting; often used for belting, lacing, and sealing applications

54 products

Carbon Fiber

The strongest composite we offer; comparable in strength to 6061 aluminum but lighter in weight

315 products

Carbon

An electrical conductor that’s often used in electronics and sensors

21 products

Pigments and Dyes

Add color to liquids, mixtures, and materials

31 products

Fastening and Joining

Adhesive Primers

Prepare surfaces before adding adhesives to improve bonding strength

19 products

Adhesives

Bond surfaces together

623 products

Threadlockers

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

112 products

Adhesive Dispensing Gun Nozzles

Pair with cartridges in dispensing guns to control the flow of adhesive

79 products

Adhesive Accelerators

Speed up the time it takes adhesives to reach full strength

12 products

Retaining Compounds

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

43 products

Glue Guns

Melt and dispense hot-melt glue

12 products

Tape

Bind, seal, and mark surfaces

1,841 products

Tape Dispensers

Store and cut lengths of tape

50 products

Fastener Assortments

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

3 products

Press-Fit Nuts

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

2 products

Standoff Caps

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

66 products

Sealing Washers

Prevent fluids from leaking around fasteners

751 products

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

167 products

Insulating Washers

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

10 products

Building and Machinery Hardware

Edge Trim

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

434 products

Wall Bases

Protect the bottom of walls from foot traffic and impact

12 products

Panel Connecting Trim

Connect two panels while protecting the edges from damage

33 products

Grommets

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

941 products

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

230 products

Corner Guards

Shield corners on walls and other surfaces from impact

82 products

Protective Plugs

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

1,011 products

Weatherstripping

Seal gaps around doors, windows, and frames

88 products

Door Drip Guards

Divert rain and snow away from door openings

13 products

Threshold Ramps

Create a gradual incline between uneven floor surfaces for wheelchairs and other wheeled equipment

6 products

Protective Caps

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

1,045 products

Thresholds

Transition between flooring surfaces and reduce gaps between doors and floors

24 products

Privacy Sprays

Block the view through windows by adding a frosted effect

1 product

Way Wipers

Sweep debris away from machining tables, rails, and ball screws

21 products

Window Film

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

27 products

T-Slotted Framing and Fittings

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

44 products

Facility and Grounds Maintenance

Toilet Sealing Rings

Prevent leaks where toilets mount to the floor or wall

8 products

Toilet Spuds

Connect wall-mount toilets to a flush valve

14 products

Urinal Spuds

Connect wall-mount urinals to a flush valve

5 products

Toilet Tank-to-Bowl Gaskets

Create a tight seal between a toilet tank and bowl

2 products

Flush Valve Replacement Parts

Replace virtually any part in the most common flush valve brands

195 products

Urinal Flanges

Connect a urinal to your drainage system

2 products

Urinal Sealing Rings

Prevent leaks where urinals mount to the wall

2 products

Toilet Tank Replacement Parts

Replace parts such as flappers, fill valves, and floats in your toilet tank

23 products

Drain Check Valves

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

3 products

Plumber's Putty

Mold into a watertight, removable seal around faucets and drains

3 products

Floor Drain Trap Seals

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

4 products

Drain Cleanouts

Create an access point to inspect and clean floor drain pipelines

3 products

Paint

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

68 products

Touch-Up Paint Pens

Cover scratches in paint and coatings

5 products

Wood Stains

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

1 product

Surface Fillers

Repair chips, cracks, and tears in various surfaces

198 products

Paint Primers

Extend the life of paint and coatings by preparing surfaces beforehand

38 products

Leather Lubricants

Extend the life of leather; also known as castor oil

2 products

Fabric Coatings

Preserve the appearance of fabric by blocking liquids and UV rays

4 products

Wood Stain Pens

Touch up nicks and scratches on wood

1 product

Protective Coatings

Shield surfaces from the surrounding environment

140 products

Leather Conditioners

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

2 products

Protective Coating Primers

Prepare metal surfaces for powder coating

2 products

Powder Coating Sprayers

Evenly apply powder coatings to small or large parts

2 products

Sealant Removers

Clean sealant and caulk off tools and other surfaces

2 products

Roof Coatings

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

9 products

Drywall Tape

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

2 products

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

4 products

Electrical

Wire Sleeving

Bundle wiring and protect from abrasion and heat

885 products

Heat-Shrink Tubing Seal Wrap

Wrap around wire like tape to create a moisture resistant seal before adding heat-shrink tubing

5 products

Electrical Enclosure Plugs

Block or seal holes in outlet boxes and enclosures to keep out debris, dust, and moisture

77 products

Solder Mask

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

4 products

Heat-Shrink Tubing

Apply heat to seal and insulate electrical wiring and connections

781 products

Potting Compounds

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

63 products

Conformal Coatings

Secure and insulate components on circuit boards and other electronics

27 products

Conduit and Conduit Fittings

Protect wiring from impact and the environment in runs indoors, outdoors, and underground

194 products

DIN Rail Caps

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

2 products

Wire Sleeving Installation Tools

Insert wire and hose into corrugated, spiral wrap, or wraparound sleeving

7 products

Electrical Connector Clips

Attach to data connectors to lock them in place, repair them, or color code them

4 products

Manual Switch Seals

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

6 products

Thermal Interface Material

Dissipate heat away from electronic components

24 products

Potentiometer Panel Seals

Keep moisture and dust out of potentiometers

4 products

Manual Switch Covers

Completely cover switches to protect them from moisture and dust

50 products

Capacitor Boots

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

3 products

Data Port Locks

Block USB or Ethernet ports from unauthorized use

9 products

Data Port Plugs

Keep dust, debris, and moisture out of unused computer ports

3 products

Fabricating and Machining

Casting Compounds

Mix and pour into molds to capture intricate detail when casting parts, linings, and prototypes

79 products

Anodizing Kits

Coat aluminum parts for added resistance to corrosion and chemicals

1 product

Blackener Kits

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

6 products

Zinc-Plating Kits

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

3 products

Fixture Plate Plugs

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

1 product

Measuring and Inspecting

Tamper-Evident Paint

Cracks from movement when dried on equipment to indicate vibration or tampering

12 products

O-Ring Gauges

Identify the size of your O-ring

4 products

Leak-Detecting Dyes

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

1 product

Fluid Handling

Valve Repair Kits

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

161 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

338 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

28 products

Gauge Guards

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

15 products

Filter Fabric

Fit into irregular shapes and take contaminants out of liquid

29 products

Strainers

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

9 products

Thermal Paste

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

18 products

Pipe and Pipe Fittings

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

2,011 products

Tube and Tube Fittings

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

33 products

Thermocouple Connector Covers

Shield thermocouple connectors from dust and debris

1 product

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

73 products

Power Transmission

Cylinder Rod Glands

Replace the rod gland on hydraulic cylinders

15 products

Compressed Air Filter Seals

Replace O-rings in compressed air filters

17 products

Hydraulic Cylinder Seals

Replace seals on the piston or rod end of hydraulic cylinders

36 products

Rod End Seals

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

16 products

Springs

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

74 products

Material Handling

Inner Tubes

Pair with a matching tire for a smooth ride

14 products

Dock Door Seals

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

9 products

Conveyor Brushes

Position items on conveyor belts and wipe off debris

210 products

Conveyor Guides

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

10 products

Dock Door Shelters

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

4 products

Conveyor Brush Holders

Mount conveyor brushes at point of use

62 products

Dock Bumpers

Prevent damage to docks and vehicles by absorbing impacts

2 products

Tire Sealants

Prevent tire punctures or plug them on the spot

6 products

Tire Repair Kits

Temporarily patch holes in leaking tires

2 products

Strapping Sealers

Crimp clips onto strapping to hold it tight

23 products

Strapping Buckles

Hold strapping in light duty and low-tension applications

17 products

Strapping Seals

Crimp onto strapping to keep it under tension

28 products

Containers, Storage, and Furniture

Dust Covers

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

16 products

Heating, Ventilation, and Air Conditioning

Pipe Insulation

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

888 products

Insulation Fill

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

1 product

Foam Insulation Coatings

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

1 product

Spray Foam Insulation

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

15 products

Chimney Pipe and Fittings

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

3 products

Air Conditioner Service Valve Caps

Seal off AC service valves to prevent refrigerant from leaking out

2 products

Safety Equipment

Fire Stops

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

20 products

Bearing Guards

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

20 products

Electrical Protection Blankets

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

6 products

Drum Patches

Patch drum leaks to prevent their contents from spilling

2 products

Communication

Tamper-Evident Seals

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

125 products