Metric Caps | McMaster-Carr

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1,399 Products

Most Likely Products

Pipe and Fittings

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

424 products

Tube End Caps

Cover the ends of tube to keep out dirt and debris

57 products

Protective Plugs

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

47 products

Electrical Connector Caps

Protect data connectors when not in use

4 products

Cap Nuts

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

69 products

All Results

Fluid Handling

Pipe and Fittings

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

424 products

Tube End Caps

Cover the ends of tube to keep out dirt and debris

57 products

Tube End Plugs

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

57 products

Tube Fittings

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

35 products

Hose and Hose Fittings

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

7 products

Breather Vents

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

18 products

Sights

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

6 products

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

6 products

Building and Machinery Hardware

Protective Plugs

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

47 products

T-Slotted Framing End Caps

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

28 products

T-Slotted Framing Covers

Block dust and debris from entering T-slotted rails; add a wear- or slip-resistant surface

22 products

T-Slotted Framing Seals

Fill gaps around doors and panels to keep air, dust, and liquid out of T-slotted framing structures

35 products

T-Slotted Framing Mounts

Connect tubes, switches, casters, and other components to T-slotted rails

7 products

Knobs

Position, tighten, and secure fixtures and equipment

125 products

Leveling Mount Inserts

Slip onto equipment and furniture to add threaded-stud leveling feet

15 products

Protective Feet

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

2 products

Electrical

Electrical Connector Caps

Protect data connectors when not in use

4 products

Electrical Sockets

Pair with plugs or receptacles to transmit power or data

11 products

Electrical Plugs

Pair with sockets or receptacles to transmit power or data

16 products

Electrical Adapters

Change electrical connectors to another type, size, or gender

1 product

Electrical Enclosure Plugs

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

9 products

Electrical Enclosure Drains

Release moisture to keep components dry

2 products

Electrical Enclosure Drain Vents

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

5 products

Fastening and Joining

Cap Nuts

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

69 products

Quick-Release Pin Receptacles

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

10 products

Quick-Release Pin Retaining Caps

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

5 products

Retaining Rings

Hold components on a shaft

46 products

Lubricating

Grease Fitting Adapters

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

11 products

Grease Fittings

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

185 products

Measuring and Inspecting

Variance Indicator Caps

Cover and color-code the spindle on your variance indicator

1 product

Containers, Storage, and Furniture

Drum Plugs

Seal drum lid openings

2 products