3/8"-16 Screws | McMaster-Carr

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4,604 Products

Fastening and Joining

Hex Head Screws

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

987 products

Socket Head Screws

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

386 products

Flat Head Screws

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

251 products

Rounded Head Screws

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

265 products

Shoulder Screws

Rotate parts around the cylinder under the head to guide and align them during installation

448 products

Carriage Bolts

A smooth head provides a finished look while a square neck keeps the bolt in place when using a nut

172 products

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

271 products

12-Point Screws

12 contact points handle more torque than a hex head while a flange eliminates the need for a washer

29 products

Thumb Screws

Tighten and loosen by hand without the need for tools

118 products

Tapping Screws

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

47 products

Pentagon Head Screws

Create a tamper-resistant joint with a head than can only be removed with a 5-point socket

10 products

Plow Bolts

The head sits flush with countersunk holes while the bolt stays in place when tightening a nut

6 products

T-Bolts

Turn by hand for easy fastening, use as a handle, or attach as a point for straps and clamps

6 products

Square Head Screws

Turn the large flat sides with a wrench into square holes that stop further rotation

22 products

Elevator Bolts

Create a flush joint to allow movement in tight spaces such as grain elevators and belting systems

37 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

9 products

Studs

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

30 products

Oval Head Screws

The domed top sits slightly above the surface of countersunk holes for a decorative look

4 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

7 products

Hold-Down Bolts

Hold material under the bent head while the other end is tightened down with a nut

1 product

Rivet Nuts

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

36 products

Weld Nuts

Weld to metal surfaces to add permanent threads

30 products

Anchors

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

142 products

Binding Barrels

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

28 products

Standoffs

Separate, position, or connect components in assemblies

8 products

Thread Adapters

Join threads of a different type, size, and gender

321 products

Threaded Rods

Anchor, connect, or hang components in a wide variety of applications

390 products

Single-End Studs

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

11 products

Spring Plungers

Apply accurate, consistent pressure for positioning, indexing, and ejecting parts

117 products

Anchor Toggles

Replace your anchor toggle if it falls when removing your toggle bolt

1 product

Anchor Installation Tools

Drive with a hammer to expand and secure anchors in place

5 products

Magnets

Attract or repel metal objects to hang, secure, or position them

4 products

Fabricating and Machining

T-Slot Bolts

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

22 products

Setup Studs

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

47 products

Drill Bushing Lock Screws

Prevent drill bushings from spinning

4 products

Grippers

Clamp against uneven or irregularly shaped parts such as castings for a secure hold

12 products

Fixture Clamps

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

15 products

Fixture Kits

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

6 products

Clamp Holding Screws

Replace worn holding screws in clamps or customize with different sizes or styles

8 products

Clamping Screw Clamps

Mount in a base or through a threaded hole, then tighten the tip to hold a workpiece in place

6 products

Clamping Screw Mounting Bases

Thread clamping screw clamps into the holes to hold workpieces

1 product

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

92 products

Leveling Mounts

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

4 products

Protective Feet

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

1 product

Material Handling

Eyebolts

Route rope through the loop or attach hooks and shackles for lifting

129 products

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

8 products

Wheel Axles

Connect rotating wheels and support vehicles

2 products

Electrical Power, Networking, and Controlling

Grounding Lugs

Create a common grounding path for internal components and circuits, as well as the enclosure body

1 product

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

1 product

Facility and Grounds Maintenance

Toilet Seat Fasteners

Secure toilet seat hinges to your toilet bowl

1 product

Containers, Storage, and Furniture

Hanging Hooks

Hang tools, hoses, garments, and other supplies on walls for easy access

9 products

Power Transmission

Precision Lead Screws and Nuts

Pair with a motor for accurate starts and stops in automated motion and positioning applications

23 products

Lead Screw Collars

Position components and limit travel along a lead screw

3 products

Connecting Rods

Use with rod ends and swivel joints to link components in push/pull assemblies

20 products

Measuring and Inspecting

Transfer Punches

Mark the center of an existing hole onto a separate workpiece

2 products

Fluid Handling

Float Rods

Connect valve bodies and floats to build or repair a float valve

2 products