Sealing Caps | McMaster-Carr

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5,713 Products

Building and Machinery Hardware

Protective Caps

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

1,045 products

Protective Plugs

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

1,011 products

Fluid Handling

Pipe Plugs

Insert into the ends of pipe to keep out dirt and debris

1,389 products

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

606 products

Pipe Fittings

Form threaded, barbed, flanged, and other types of connections between lengths of pipe

4 products

Hose and Hose Fittings

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

270 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

338 products

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

73 products

Heat Exchanger Plugs

Plug leaky internal tubes in heat exchangers

17 products

Electrical

Electrical Enclosure Plugs

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

77 products

Heat-Shrink Tubing End Caps

Seal moisture out of crimped electrical connections

26 products

DIN Rail Caps

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

2 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

Containers, Storage, and Furniture

Drum Plugs

Seal drum lid openings

19 products

Dust Covers

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

16 products

Syringe Caps

Cover syringe tips when not in use to protect them and prevent leaks

13 products

Fabricating and Machining

Fixture Plate Plugs

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

1 product

Heating, Ventilation, and Air Conditioning

Air Conditioner Service Valve Caps

Seal off AC service valves to prevent refrigerant from leaking out

2 products

Safety Equipment

Floor Drain Plugs

Prevent oil and other spills from going down your floor drain

3 products

Bearing Guards

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

20 products

Fastening and Joining

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

423 products

Retaining Rings

Hold components on a shaft

25 products

Threaded Inserts

Create new threads or repair stripped threads

1 product

Press-Fit Nuts

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

2 products

Quick-Release Pin Receptacles

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

35 products

Standoff Caps

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

66 products

Quick-Release Pin Retaining Caps

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

23 products

Material Handling

Conveyor Guide Mounting Rod Caps

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

7 products

Facility and Grounds Maintenance

Sink Drain Stoppers

Plug drains to fill up sinks and tubs

5 products

Shower Stoppers

Push down to plunge and cut trapped material to prevent clogs

1 product

Drain Cleanouts

Create an access point to inspect and clean floor drain pipelines

3 products

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

4 products

Communication

Tamper-Evident Seals

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

2 products