5/16"-24 Fasteners | McMaster-Carr

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1,288 Products

Fastening and Joining

Socket Head Screws

Socket Head Screws

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

Hex Head Screws

Hex Head Screws

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

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

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

Set Screws

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

Shoulder Screws

Shoulder Screws

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

Tighten and loosen by hand without the need for tools

Hex Nuts

Handle most general fastening needs

Flange Nuts

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

Locknuts

Hold fasteners in place to prevent loosening from vibration

Cap Nuts

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

Coupling Nuts

Connect and extend threaded rods

Easy to tighten and loosen by hand for making frequent adjustments

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

Square Nuts

Flat sides won’t spin in channels and square holes

Socket Nuts

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

Split Nuts

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

Tamper-Resistant Nuts

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

Weld Nuts

Weld to metal surfaces to add permanent threads

Threaded Inserts

Threaded Inserts

Create new threads or repair stripped threads

Rivet-Mount Nuts

Rivet-Mount Nuts

Add threads in hard-to-reach areas and materials that are too thin to be tapped

Rivet Nuts

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

Press-Fit Nuts

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

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

Single-End Studs

Single-End Studs

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

Threaded Rods

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

Taper Pins

Fit snugly into tapered holes to secure, position, and align components

Rivet Nut Tools

Rivet Nut Tools

Install rivet nuts

Power Transmission

Connecting Rods

Connecting Rods

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

Material Handling

Turnbuckles

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

Eyebolts

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

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

Fabricating and Machining

Clamps

Hold workpieces securely in place

Lathe Tool Insert Holder Replacement Parts

Lathe Tool Insert Holder Replacement Parts

Replace clamps, screws, shims, and other parts in lathe tool insert holders

Fluid Handling

Tube and Tube Fittings

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

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