Cap Seals | McMaster-Carr

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Diluted Salt Solutions

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Electrical Insulating

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UN/UNF (SAE Straight)

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REACH

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

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7,535 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

Press-Fit Framing End Caps

Push into press-fit rails for a finished look that keeps out debris

2 products

Bolt-Together Framing End Caps

Cover the rough ends of bolt-together framing rails for a finished look

1 product

Locking-Slotted Framing End Caps

Snap onto locking-slotted rails to protect the ends and keep out dust and grime

1 product

Clamp-On Framing End Caps

Fit into the end of clamp-on framing rails to use as a cover or foot

1 product

T-Slotted Framing and Fittings

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

57 products

Slip-On Framing End Caps

Cover the rough ends of slip-on framing rails for a finished look

25 products

Fluid Handling

Pipe and Fittings

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

2,496 products

Tube Fittings

Make threaded, push to connect, barbed, and other types of connections between lengths of tube

675 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

279 products

Pipe Vent Caps

Keep rain and debris out of vertical exhaust pipe

5 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

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

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

Data Port Plugs

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

3 products

Data Port Locks

Block USB or Ethernet ports from unauthorized use

9 products

RJ45 Connector Security Clips

Lock Ethernet cords in place to prevent unauthorized removal from ports

3 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

Sealing

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

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

Heating, Ventilation, and Air Conditioning

Duct and Fittings

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

145 products

Chimney Vent Caps

Cover chimneys to reduce downdrafts and block out debris

12 products

Air Conditioner Service Valve Caps

Seal off AC service valves to prevent refrigerant from leaking out

2 products

Containers, Storage, and Furniture

Drum Plug Caps

Access inside drums to fill them

4 products

Syringe Caps

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

13 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

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products

Material Handling

Valve Stem Caps

Keep dust and debris out of tire valves

2 products

Conveyor Guide Mounting Rod Caps

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

7 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

Fabricating and Machining

Fixture Plate Plugs

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

8 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

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