4-40 Inserts | McMaster-Carr

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System of Measurement

Material

Stainless Steel

Threaded Insert Type

For Use In

Installed Length

Less than 0.25"

0.25" to 0.499"

End Type

Thread Insert Style

Thread Type

Drill Bit Size

Thread Spacing

For Tap Thread Size

Body Length

Flange Diameter

Thread Direction

For Use On

Stainless Steel

Helical Insert Style

REACH

Thread Fit

Unified Standard Class 1B

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Specifications Met

RoHS

Compliant with Exemptions

DFARS Specialty Metals

Nut Type

Number of Inserts Included

For Material Thickness

Export Control Classification Number (ECCN)

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297 Products

Fastening and Joining

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

Rivet Nuts

Add threads to thin panels with access from only one side; also known as blind inserts

Weld Nuts

Weld to metal surfaces to add permanent threads

Rivet-Mount Nuts

Rivet-Mount Nuts

Add threads in hard-to-reach areas and materials that are too thin to be tapped

Adhesive-Mount Nuts

Adhesive-Mount Nuts

Attach threads to material that’s too thin for a threaded insert

Standoff Caps

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

Studs

Press, weld, or screw in place to add a threaded fastening point

Socket Nuts

Install in recessed holes and tight spots where a wrench won’t fit; also known as Allen nuts

Threaded Insert Installation Tools

Threaded Insert Installation Tools

Install helical, key-locking, slotted-drive, and other threaded inserts

Press-Fit Nut Installation Tools

Press-Fit Nut Installation Tools

Everything you need to install press-fit nuts by hand

Rivet Nut Tools

Rivet Nut Tools

Install rivet nuts

Threaded Insert Removal Tools

Threaded Insert Removal Tools

Turn counterclockwise to extract helical inserts

Fabricating and Machining

Taps

Cut internal threads for fasteners, pipe, conduit, and more

Fixture Clamps

Secure your workpiece to a fixture table so it won't move during machining

Building and Machinery Hardware

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

Vibration-Damping Mounts

Vibration-Damping Mounts

Attach to machinery to reduce vibration and noise and extend service life

Fluid Handling

Bore Sealing Plugs

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

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