3/8"-16 Nuts | McMaster-Carr

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1,541 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

110 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

65 products

Flange Nuts

The flange distributes pressure, so you don't need a washer

38 products

Coupling Nuts

Connect and extend threaded rods

36 products

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

32 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

33 products

Square Nuts

Flat sides won’t spin in channels and square holes

12 products

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

10 products

Socket Nuts

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

2 products

Push-Button Nuts

Disengage the threads to quickly slide along threaded rods

3 products

Split Nuts

Swivel to attach at any point on a threaded rod for quick installation

2 products

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

2 products

Weld Nuts

Weld to metal surfaces to add permanent threads

30 products

Rivet Nuts

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

33 products

Press-Fit Nuts

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

8 products

Screw-Mount Nuts

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

4 products

Clip-On Nuts

Slide onto the edge of thin panels to create a fastening point

6 products

Threaded Inserts

Create new threads or repair stripped threads

194 products

Snap-In Nuts

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

7 products

Dowel Nuts

Form joints in blind holes in wood

1 product

Adhesive-Mount Nuts

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

8 products

Push Nuts

Press onto threads for a light duty hold that’s faster to install than typical nuts

1 product

Tube-Connecting Nuts

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

2 products

Thread Adapters

Join threads of a different type, size, and gender

321 products

Standoffs

Threaded to separate or connect parts as well as position components in assemblies

82 products

Binding Barrels and Screws

Thread together for a low-profile fastener

28 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

1 product

Thumb Screws

Tighten and loosen by hand without the need for tools

10 products

Studs

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

32 products

Hex Head Screws

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

Install and remove blind, solid, hollow, and other types of rivets

1 product

Building and Machinery Hardware

Strut Channel Nuts

Fasten on threaded rod to connect components to strut channel

35 products

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

5 products

Leveling Mount Inserts

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

27 products

Fabricating and Machining

T-Slot Nuts

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

28 products

T-Slot Bolts

Secure clamps and workpieces to machine tables with quicker setup than a T-slot nut and stud

16 products

Fixture Kits

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

6 products

Setup Studs

Secure setup clamps and fixtures to your machine table or assemble heavy machines

47 products

Fixture Clamps

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

4 products

Facility and Grounds Maintenance

Toilet Seat Fasteners

Secure toilet seat hinges to your toilet bowl

1 product

Material Handling

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

8 products

Turnbuckles

Twist the body or end fittings to adjust the length and tension of attached rope and chain

8 products

Electrical

Terminal Covers

Block out dirt and corrosion to protect battery terminals

2 products

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

1 product

Power Transmission

Lead Screws and Nuts

Components travel along a screw with broad, square threads to clamp and lift heavy loads

23 products