3/8"-16 Bolts | McMaster-Carr

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Unified Standard Class 3B

Tensile Strength

Less than 10,000 psi

10,000 psi to 19,999 psi

20,000 psi to 29,999 psi

30,000 psi to 99,999 psi

100,000 psi or greater

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Compliant with Exemptions

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REACH

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Export Control Classification Number (ECCN)

4,692 Products

Fastening and Joining

Hex Head Screws

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

807 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

252 products

Rounded Head Screws

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

260 products

Carriage Bolts

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

168 products

Thumb Screws

Tighten and loosen by hand without the need for tools

115 products

12-Point Screws

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

22 products

Shoulder Screws

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

442 products

Tapping Screws

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

43 products

T-Bolts

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

6 products

Set Screws

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

268 products

Pentagon Head Screws

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

8 products

Plow Bolts

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

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

39 products

Hold-Down Bolts

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

1 product

Captive Panel Screws

Secure panels and enclosures while still having access to them

7 products

Oval Head Screws

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

4 products

Threaded Rods

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

390 products

Standoffs

Separate, position, or connect components in assemblies

9 products

Anchors

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

142 products

Single-End Studs

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

11 products

Thread Adapters

Join threads of a different type, size, and gender

229 products

Rivet Nuts

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

33 products

Weld Nuts

Weld to metal surfaces to add permanent threads

30 products

Binding Barrels

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

28 products

Spring Plungers

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

127 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

T-Slot Nuts

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

28 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

Fixture Clamps

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

19 products

Fixture Kits

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

3 products

Clamp Holding Screws

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

8 products

Clamp Holding Screw Tips

Cover metal holding screws to protect workpieces from scratches

4 products

Material Handling

Eyebolts

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

129 products

Hoist Rings

Pivot to resist stress that would bend or break an eyebolt when lifting at an angle

15 products

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

8 products

U-Bolts

Anchor heavy pipe, tube, and conduit; stronger than routing clamps and hangers

288 products

Routing Rings

Suspend wire and cable by feeding it through the eyehole

4 products

Wheel Axles

Connect rotating wheels and support vehicles

2 products

Electrical

Grounding Lugs

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

1 product

Battery Terminal Fasteners

Replace bolts in battery terminals

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

Power Transmission

Rod Ends

Use with connecting rods to support loads and control steering, tensioning, or pivoting motion

68 products

Connecting Rods

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

20 products

Lead Screw Collars

Position components and limit travel along a lead screw

3 products

Precision Lead Screws and Nuts

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

20 products

Containers, Storage, and Furniture

Hanging Hooks

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

9 products

Building and Machinery Hardware

Cam Handles

For fast clamping, push down on the handle to draw two parts together

8 products