UNC Plugs | McMaster-Carr

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System of Measurement

Thread Size

Material

Stainless Steel

Threaded Insert Type

For Use In

Stainless Steel

Installed Length

Less than 0.25"

0.25" to 0.499"

10 mm to 19.9 mm

Length

For Tap Thread Size

Screw Features

Fastener Head Type

Drive Style

Tamper-Resistant Torx

Thread Direction

End Type

Drill Bit Size

Thread Spacing

DFARS Specialty Metals

Helical Insert Style

RoHS

Compliant with Exemptions

Finish

Corrosion-Resistant Coated

Dry Film Lubricated

Phosphate Coated

REACH

Export Control Classification Number (ECCN)

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Thread Insert Style

Tensile Strength

Less than 20,000 psi

20,000 psi to 39,999 psi

40,000 psi to 49,999 psi

50,000 psi to 99,999 psi

100,000 psi or greater

Threading

Partially Threaded

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2,348 Products

Fastening and Joining

Hex Head Screws

Hex Head Screws

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

Socket Head Screws

Socket Head Screws

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

Rounded Head Screws

Rounded Head Screws

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

Flat Head Screws

Flat Head Screws

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

Tapping Screws

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

Standoff Caps

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

Threaded Inserts

Threaded Inserts

Create new threads or repair stripped threads

Press-Fit Nuts

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

Fluid Handling

Breather Vents

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

Pipe Plugs

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

Measuring and Inspecting

Threaded Hole Location Gauges

Threaded Hole Location Gauges

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

Plug Gauges

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

Electrical

Electrical Adapters

Electrical Adapters

Change electrical connectors to another type, size, or gender

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)