Metric Plugs | McMaster-Carr

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Fed. Spec. QQ-A-200/8

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3,204 Products

Fluid Handling

Pipe Plugs

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

369 products

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

46 products

Tube End Plugs

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

57 products

Tube End Caps

Cover 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

32 products

Hose and Hose Fittings

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

5 products

Breather Vents

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

18 products

Pressure Test Plugs

Tighten onto equipment to check pressure without permanently installing a gauge

3 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

12 products

Building and Machinery Hardware

Protective Plugs

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

47 products

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

50 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

9 products

Cord Grips

Securely connect cords to enclosures while sealing out dirt and moisture

116 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

Power Connectors

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

33 products

Solenoid Valve Sockets

Pair with plugs or receptacles to connect solenoid components

1 product

Latching Connector Inserts

Male and female inserts for making connections inside hoods and bases

4 products

Electrical Connector Caps

Protect data connectors when not in use

4 products

Power Cords

Connect equipment and devices to a power source

4 products

Distribution Bars

Route electricity within switchboards and battery banks; also known as bus bars

9 products

Terminal Blocks

Create tidy rows of wire connections that you can identify, test, and adjust on the spot

281 products

Fastening and Joining

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

69 products

Socket Head Screws

With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold

167 products

Hex Head Screws

Used with nuts to create a stronger joint than flat and rounded screws

44 products

Flat Head Screws

Fit in countersunk holes for a flush finish that won't snag on surrounding parts

120 products

Quick-Release Pin Receptacles

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

11 products

Quick-Release Pin Retaining Caps

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

5 products

Dowel Pins

Align parts before assembly or use as a pivot, shaft, or hinge to join moving components

16 products

Threaded Inserts

Create new threads or repair stripped threads

1,229 products

Rivets

Join materials together permanently, especially when too thin or fragile to fasten with screws

10 products

Lubricating

Grease Fittings

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

190 products

Grease Fitting Adapters

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

11 products

Measuring and Inspecting

Plug Gauges

Verify the diameter or threads of machined holes in finished parts; also called pin gauges

41 products