3/8"-16 Bolts | McMaster-Carr

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4,445 Products

Fastening and Joining

Hex Head Screws

Hex Head Screws

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

Socket Head Screws

Socket Head Screws

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

Flat Head Screws

Flat Head Screws

Fit in countersunk holes for a flush finish

Rounded Head Screws

Rounded Head Screws

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

Carriage Bolts

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

12-Point Screws

12-Point Screws

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

Tighten and loosen by hand without the need for tools

Shoulder Screws

Shoulder Screws

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

Tapping Screws

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

Pentagon Head Screws

Pentagon Head Screws

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

Set Screws

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

T-Bolts

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

Square Head Screws

Square Head Screws

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

Plow Bolts

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

Elevator Bolts

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

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

Studs

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

Hold-Down Bolts

Hold-Down Bolts

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

Fastener Assortments

Fastener Assortments

Stay prepared by keeping fasteners in common sizes and materials on hand

Captive Panel Screws

Captive Panel Screws

Secure panels and enclosures while still having access to them

Threaded Rods

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

Anchors

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

Single-End Studs

Single-End Studs

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

Standoffs

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

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

Binding Barrels and Screws

Binding Barrels and Screws

Thread together for a low-profile fastener

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

Spring Plungers

Spring Plungers

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

Magnets

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

Material Handling

Eyebolts

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

Hoist Rings

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

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

U-Bolts

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

Routing Rings

Suspend wire and cable by feeding it through the eyehole

Wheel Axles

Connect rotating wheels and support vehicles

Fabricating and Machining

T-Slot Bolts

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

T-Slot Nuts

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

Setup Studs

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

Drill Bushing Lock Screws

Drill Bushing Lock Screws

Prevent drill bushings from spinning

Fixturing Clamps

Fixturing Clamps

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

T-Slot Fastener and Fixturing Clamp Kits

T-Slot Fastener and Fixturing Clamp Kits

Everything you need to secure a workpiece to a fixture table

Electrical

Grounding Lugs

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

Battery Terminal Fasteners

Battery Terminal Fasteners

Replace bolts in battery terminals

Facility and Grounds Maintenance

Toilet Seat Fasteners

Toilet Seat Fasteners

Secure toilet seat hinges to your toilet bowl

Containers, Storage, and Furniture

Hanging Hooks

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

Power Transmission

Connecting Rods

Connecting Rods

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

Lead Screws and Nuts

Lead Screws and Nuts

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

Building and Machinery Hardware

Cam Handles

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

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