5/16"-18 Inserts | McMaster-Carr

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1,143 Products

Fastening and Joining

Threaded Inserts

Create new threads or repair stripped threads

212 products

Rivet Nuts

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

45 products

Screw-Mount Nuts

Mount with screws, rivets, and nails to add threads to a surface

6 products

Press-Fit Nuts

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

8 products

Weld Nuts

Weld to metal surfaces to add permanent threads

40 products

Tube-Connecting Nuts

Push inside tubes to join them with a threaded stud instead of welding

7 products

Snap-In Nuts

Push into square holes in thin materials to add bolts for aligning off-center parts

8 products

Adhesive-Mount Nuts

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

10 products

Dowel Nuts

Form joints in blind holes in wood

4 products

Studs

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

82 products

Anchors

Secure anything from signs to heavy machinery in concrete, brick, and drywall

43 products

Binding Barrels

Create custom low-profile fasteners with binding barrel posts, caps, and screws

75 products

Socket Nuts

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

2 products

Standoff Caps

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

52 products

Single-End Studs

Use the unthreaded end as a pivot point, hinge, shaft, or locator pin

11 products

Threaded Insert Installation Tools

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

25 products

Threaded Insert Removal Tools

Turn counterclockwise to extract helical inserts

Anchor Installation Tools

Drive with a hammer to expand and secure anchors in place

1 product

Fabricating and Machining

Taps

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

3 products

T-Slot Nuts

Combine with setup studs or bolts to mount fixtures to machine tables

14 products

Fixture Kits

Everything needed to mount workpieces of different sizes to your machine table

2 products

Fixture Clamps

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

17 products

Building and Machinery Hardware

Leveling Mount Inserts

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

6 products

Leveling Mounts

Level machines and workbenches on uneven surfaces, reduce vibration, and protect floors

71 products

Vibration-Damping Mounts

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

112 products

Protective Feet

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

3 products

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

76 products

T-Slotted Framing and Fittings

The most versatile system, attach fittings along the continuous slots to build virtually anything

33 products

Strut Channel Framing and Fittings

Secure fittings in the U-shaped channel to route conduit and pipe or build other structures

19 products

Material Handling

Caster Sockets

Mount on the inside corners of channel and other framing to attach stem casters

1 product