Plug Caps | McMaster-Carr

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Air Conditioner Service Valve Caps

AMP Connectors

Battery Vent Caps

Bearing Guards

Bolt-Together Framing and Fittings

Bore Sealing Plugs

Breather Vents

Capacitor Boots

Cartridge Sealing Caps

Chimney Pipe and Fittings

Circuit Breaker Box Filler Plates

Clamp-On Framing and Fittings

Coaxial Connector Caps

Cold-Shrink Tubing End Caps

Conveyor Guide Mounting Rod Caps

Coolant Hose and Fittings

Material

System of Measurement

Pipe Size

Fitting Type

Shape

Thread Type

Chicago Fire Department

Color

Attachment Type

For Use With

Alcohol-Based Solvents

Gender

Thread Size

Profile Shape

Drive Style

Pipe Material

Fitting Connection

Head Width

Head Diameter

Inside Width

REACH

RoHS

Compliant with Exemptions

Performance

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

Yes

DFARS Specialty Metals

Compliant

Exempt

Not Compliant

Export Control Classification Number (ECCN)

Help me decide (beta)

11,494 Products

Building and Machinery Hardware

Protective Plugs

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

1,009 products

Protective Caps

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

1,070 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

Clamp-On Framing End Caps

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

1 product

Slip-On Framing End Caps

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

25 products

Locking-Slotted Framing End Caps

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

1 product

Strut Channel Plugs

Plug strut channel ends to protect from sharp edges

28 products

T-Slotted Framing End Caps

Snap onto T-slotted rail ends to cover sharp edges and keep out dust

39 products

Protective Feet

Add to furniture and light equipment to protect floors from scratches and wear

184 products

Fluid Handling

Pipe and Fittings

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

2,784 products

Tube Fittings

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

1,213 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

Breather Vents

Maintain even pressure and vacuum as temperatures change by allowing airflow in tanks and enclosures

155 products

Pressure-Relief Valves

Protect equipment by opening at a set pressure and closing when the pressure drops; for repeated use

17 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

31 products

Sights

Observe and monitor the contents of pipes, tanks, and other containers

243 products

Thermocouple Connector Covers

Shield thermocouple connectors from dust and debris

1 product

Heat Exchanger Plugs

Plug leaky internal tubes in heat exchangers

17 products

Electrical Power, Networking, and Controlling

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

22 products

Cold-Shrink Tubing End Caps

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

4 products

Outlet Boxes

House electrical components such as on-off switches, receptacles, and dimmer knobs

7 products

Electrical Enclosure Drains

Release moisture to keep components dry

4 products

DIN Rail Caps

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

2 products

Electrical Enclosure Drain Vents

Prevent moisture from getting trapped inside enclosures while letting air flow through

6 products

Metric Circular Connector Caps

Keep metric circular connectors safe when they're not in use

11 products

Power Connectors

Plugs, sockets, receptacles, and other connectors for powering equipment

1,376 products

Power Connector Caps

Cover pin-and-sleeve power connectors when they're not in use

38 products

RJ45 Connector Caps

Protect sockets and maintain the IP67 rating when not in use

1 product

Mil. Spec. Connector Caps

Protect Mil. Spec. connectors when they're not in use

12 products

Metric Circular Connectors

Plugs, sockets, receptacles, and adapters for equipment with metric connections

68 products

USB Connector Caps

Shield unused USB connectors from damage, contaminants, and moisture

3 products

Mini Connector Thread Adapters

Join two connectors that both have internal threads

6 products

Mil. Spec. Connectors

Meet strict military standards or are compatible with Mil. Spec. connectors

95 products

AMP Connectors

Build-your-own and ready-to-use AMP connectors

80 products

Solenoid Valve Connectors

Sockets and receptacles to connect solenoid components, such as valves and motors

17 products

Ecomate Connectors

Connect machine tools, robots, and other vibrating equipment

14 products

Molex Connectors

Plugs, sockets, and housings for making Molex connections

121 products

Latching Connectors

Protect connections in wet or harsh environments while keeping them accessible

206 products

Sure Seal Connectors

A PVC housing keeps out liquids and dust and resists chemicals

6 products

Micro 360 Connectors

Plugs and sockets to make control and data connections in tight spaces

6 products

Han Connectors

Plugs and sockets to make Han connections

8 products

Mini Receptacles

Install in walls and panels and pair with plugs to send power and signal

9 products

RJ45 Connector Security Clips

Lock Ethernet cords in place to prevent unauthorized removal from ports

3 products

Coaxial Connector Caps

Terminate the end of an unused coaxial cable

2 products

RJ45 Connector Repair Clips

Snap onto broken Ethernet plugs to restore their ability to make secure connections

1 product

Mini Connector Caps

Shield mini connectors when they're not in use

13 products

Metric Circular Cords

Send power and control signals to equipment with metric connections

103 products

Solenoid Valve Cords

Connect solenoid components, such as valves and motors

43 products

Extension Cords

Extend the reach of power from an outlet

27 products

Mini Cords

Often used to send power and control signals to automated systems, motors, and pumps

9 products

USB Cords

Transfer data between computers, printers, and mobile devices

1 product

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

Battery Vent Caps

Flip open to check water levels and fill wet-cell batteries

1 product

Circuit Breaker Box Filler Plates

Conceal live electrical components in circuit breaker boxes to prevent injury and damage

2 products

Capacitor Boots

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

3 products

Containers, Storage, and Furniture

Syringe Caps

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

13 products

Drum Plug Caps

Access inside drums to fill them

4 products

Drum Locks

Secure drum lids and openings to prevent tampering

2 products

Dust Covers

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

16 products

Drum Plugs

Seal drum lid openings

27 products

Fuel Caps

Seal fuel tanks on trailers, compressors, and other equipment

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

Grease Fittings

Create an inlet on equipment and machinery for injecting lubricant; also known as Zerk fittings

360 products

Grease Fitting Adapters

Mate grease fittings when the sizes and thread types don't match

41 products

Grease Fitting Manifolds

Lubricate multiple points with the same amount and type of grease using one grease fitting

3 products

Grease Fitting Installation Tools

Tap to insert grease fittings in unthreaded holes

2 products

Grease Fitting Junction Blocks

Send different types and amounts of grease from multiple grease fittings to lubricate several points

9 products

Fastening and Joining

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

Standoff Caps

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

66 products

Quick-Release Pin Receptacles

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

36 products

Quick-Release Pin Retaining Caps

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

23 products

Cartridge Sealing Caps

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

1 product

Fabricating and Machining

Fixture Plate Plugs

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

8 products

Facility and Grounds Maintenance

Drain Cleanouts

Create an access point to inspect and clean floor drain pipelines

3 products

Shower Stoppers

Push down to plunge and cut trapped material to prevent clogs

1 product

Sink Drains

Empty liquids from sinks into sewer lines

19 products

Sink Drain Stoppers

Plug drains to fill up sinks and tubs

5 products

Faucet Hole Covers

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

2 products

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

4 products

Safety Equipment

Fire Hydrant Caps

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

6 products

Fire Hydrant Plugs

Pair with a hook-style spanner wrench to quickly seal fire hydrants and washdown equipment

3 products

Bearing Guards

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

20 products

Spill-Control Drain Covers

Block grates and manholes so liquid can't get in and odors can't get out

7 products

Floor Drain Plugs

Prevent oil and other spills from going down your floor drain

3 products

Lighting

Light Switch/Receptacles

Combine a switch and receptacle into a single outlet box for a small footprint

1 product

Heating, Ventilation, and Air Conditioning

Chimney Vent Caps

Cover chimneys to reduce downdrafts and block out debris

12 products

Duct Vent Caps

Reduce downdrafts and prevent obstructions from entering vents

36 products

Air Conditioner Service Valve Caps

Seal off AC service valves to prevent refrigerant from leaking out

2 products

Power Transmission

Die Spring Screw Caps

Brace springs and control tension in die sets while simplifying maintenance

10 products

Material Handling

Conveyor Guide Mounting Rod Caps

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

7 products

Communication

Tamper-Evident Seals

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

2 products

Sealing

Drum Plug Gaskets

Form a tighter seal in drum openings than with a drum plug alone

7 products