UNC Plugs | McMaster-Carr

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DFARS Specialty Metals

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

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Unified Standard Class 2A

Unified Standard Class 2B

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Corrosion-Resistant Coated

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2,420 Products

Fastening and Joining

Hex Head Screws

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

86 products

Socket Head Screws

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

152 products

Rounded Head Screws

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

163 products

Flat Head Screws

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

113 products

Tapping Screws

Fasten a range of materials together without needing to tap the hole first

13 products

Threaded Inserts

Create new threads or repair stripped threads

1,576 products

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

1 product

Standoff Caps

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

66 products

Fluid Handling

Pipe Plugs

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

2 products

Breather Vents

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

2 products

Measuring and Inspecting

Threaded Hole Location Gauges

Pinpoint the true center of threaded holes to precisely align and measure parts

19 products

Plug Gauges

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

132 products

Building and Machinery Hardware

Leveling Mount Inserts

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

94 products

Electrical Power, Networking, and Controlling

RJ45 Adapters

Connect two Ethernet cords together

7 products