Cap Seals | McMaster-Carr

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Diluted Salt Solutions

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Electrically Insulating

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

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Export Control Classification Number (ECCN)

2A992

2B999

EAR99

DFARS Specialty Metals

7,231 Products

Building and Machinery Hardware

Protective Caps

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

1,070 products

Protective Plugs

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

1,009 products

Clamp-On Framing and Fittings

Two-piece fittings let you modify assembly stations, conveyors, and racks without dismantling them

1 product

T-Slotted Framing and Fittings

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

39 products

Slip-On Framing and Fittings

Insert rails into fittings and tighten screws to make guards, railings, and racks

25 products

Bolt-Together Framing and Fittings

Fasten through equally spaced holes to build and adjust guards, tables, and racks

1 product

Press-Fit Framing and Fittings

Set up temporary partitions, guards, and displays using only a hammer

2 products

Locking-Slotted Framing and Fittings

Make platforms, bases, and other structures that stand up to more movement than T-slotted framing

1 product

Fluid Handling

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

2,208 products

Tube End Caps

Cover the ends of tube to keep out dirt and debris

394 products

Tube End Plugs

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

260 products

Hose and Hose Fittings

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

238 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

346 products

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

95 products

Sealing

Rod Seals

Maintain pressure inside cylinders and prevent fluid leaks

50 products

Piston Seals

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

57 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

Buffering Seals

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

22 products

Electrical Power, Networking, and Controlling

Cold-Shrink Tubing End Caps

Seal crimped electrical connections without heat or tools to protect against moisture

4 products

Heat-Shrink Tubing End Caps

Seal moisture out of crimped electrical connections

22 products

DIN Rail Caps

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

2 products

Electrical-Insulating Wire Caps

Cover live wire ends to protect against shock from accidental contact

3 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

RJ45 Connector Security Clips

Lock Ethernet cords in place to prevent unauthorized removal from ports

3 products

Material Handling

Conveyor Guide Mounting Rod Caps

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

7 products

Valve Stem Caps

Keep dust and debris out of tire valves

2 products

Containers, Storage, and Furniture

Drum Plug Caps

Access inside drums to fill them

4 products

Dust Covers

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

6 products

Vial Caps

Take samples from vials without removing the cap

15 products

Fuel Caps

Seal fuel tanks on trailers, compressors, and other equipment

2 products

Syringe Caps

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

13 products

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products

Facility and Grounds Maintenance

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

4 products

Faucet Hole Covers

Close off unused faucet holes intended for soap dispensers and side sprayers

2 products

Heating, Ventilation, and Air Conditioning

Duct and Fittings

Circulate air through HVAC systems using round, rectangular, and fabric duct

145 products

Chimney Pipe and Fittings

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

20 products

Air Conditioner Service Valve Caps

Seal off AC service valves to prevent refrigerant from leaking out

2 products

Lubricating

Grease Fitting Caps

Protect grease fittings from dirt, debris, and moisture

14 products

Coolant Hose and Fittings

Build a custom system to deliver coolant, cutting oil, water, or air in any direction

6 products

Safety Equipment

Fire Hydrant Caps

Pair with a hook-style spanner wrench to quickly cover and uncover fire hydrants

6 products

Bearing Guards

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

14 products

Fabricating and Machining

Fixture Plate Plugs

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

8 products

Fastening and Joining

Cartridge Sealing Caps

Slip over the tips of adhesive and sealant cartridges to keep contents from hardening

1 product

Standoff Caps

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

66 products

Communication

Tamper-Evident Seals

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

2 products