Plastic Caps | McMaster-Carr

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2,643 Products

Building and Machinery Hardware

Protective Caps

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

833 products

Protective Plugs

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

467 products

Press-Fit Framing and Fittings

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

1 product

T-Slotted Framing and Fittings

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

81 products

Strut Channel Framing and Fittings

Secure fittings in the U-shaped channel to route conduit and pipe or build other structures

64 products

Clamp-On Framing and Fittings

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

1 product

Bolt-Together Framing and Fittings

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

1 product

Locking-Slotted Framing and Fittings

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

1 product

Slip-On Framing and Fittings

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

11 products

Protective Feet

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

78 products

Fluid Handling

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

157 products

Pipe Plugs

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

184 products

Pipe Flanges

Create an access point in a line by bolting two same-size flanges together with a gasket

37 products

Tube and Tube Fittings

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

158 products

Hose and Hose Fittings

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

90 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

8 products

Electrical

Electrical Enclosure Plugs

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

13 products

Heat-Shrink Tubing End Caps

Seal moisture out of crimped electrical connections

26 products

Electrical Connector Caps

Protect data connectors when not in use

7 products

Electrical Connector Clips

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

4 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

1 product

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

Material Handling

Valve Stem Caps

Keep dust and debris out of tire valves

1 product

Conveyor Guide Mounting Rod Caps

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

7 products

Pallet Load Covers

Fit over boxes on pallets to shield the tops and edges from strapping gouges and impact

1 product

Ladder Pads

Cushion the top of ladders to protect surfaces

1 product

Containers, Storage, and Furniture

Dust Covers

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

16 products

Drum Plugs

Seal drum lid openings

10 products

Drum Covers

Protect drum lids from damage and rust

8 products

Pail Lids

Replace the lid on your pail with one that quickly screws open and closed

2 products

Vial Caps

Take samples from vials without removing the cap

3 products

Syringe Caps

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

13 products

Knife Sheaths

Safely store knives while protecting them from damage

7 products

Safety Equipment

Bearing Guards

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

20 products

Hard Hats

Protect your head from falling objects

50 products

Bump Cap Inserts

Tuck inside a baseball cap to protect your head from bumps and scrapes

4 products

Bump Caps

Guard against minor head bumps and scrapes

12 products

Face Shields

Protect your face from dirt, chemical splashes, and electrical and welding sparks

3 products

Clothing Kits

Prevent arc-flash burns with a hard hat, face shield, safety glasses, and other gear all in one bag

3 products

Bicycle Helmets

A multi-directional impact protection system (MIPS) reduces injury risk

1 product

Fabricating and Machining

Clamp Holding Screw Tips

Cover metal holding screws to protect workpieces from scratches

2 products

Vise Jaw Liners

Place over vise jaws to protect workpieces from marring

4 products

Lubricating

Grease Fitting Caps

Protect grease fittings from dirt, debris, and moisture

13 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

1 product

Fastening and Joining

Retaining Rings

Hold components on a shaft

12 products

Heating, Ventilation, and Air Conditioning

Duct and Duct Fittings

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

12 products

Communication

Tamper-Evident Seals

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

21 products

Sealing

Drum-Plug Gaskets

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

7 products