5/8"-18 Bolts | McMaster-Carr

With a deeper drive than flat and rounded head screws, socket head screws withstand more torque for a tighter hold. Install in a counterbored hole or above the surface.

Rounded Head Screws

A domed head sits above the surface of your material. Includes screws such as pan, button, binding, and truss head screws.

Flat Head Screws

Flat and oval head screws are angled under the head to fit in countersunk holes.

12-Point Screws

The head makes 12 points of contact with a wrench to handle more torque than a socket head or hex head screw.

Set Screws

Unlike screws that hold materials together with threads, set screws exert pressure at the tip to hold objects in place.

Threaded Rods

Inch-to-Inch Female
Hex Thread Adapters

Connect two differently sized male-threaded parts, such as threaded rods, and tighten with a standard wrench.

Coupling Nuts

Also known as extension nuts, use these to connect and extend threaded rods. They’re about three times taller than standard hex nuts.

Power Transmission

Mounting Plates for
Acme Screw Jacks

Add a flat mounting surface to to a screw jack to support loads.

Eyelet End Fittings for
Acme Screw Jacks

Attach these fittings to the end of a screw jack to create pivoting connections with clevis rod ends and other linkages.

Connecting Rods

Designed for use with right-hand threaded rod ends, these rods have right-hand threads on both ends. Use them for remote valve operators, throttle controllers, shifting mechanisms, and virtually any push/pull assembly.

Die Spring Screw Caps

In addition to providing a backing for springs, these screw caps can also be used to control spring tension.

Other Bolts

Eyebolts—For Lifting

Also known as machinery eyebolts.

Corrosion-Resistant Swivel Leveling
Mounts with Threaded Stud

Made of 303/304 stainless steel, these mounts resist corrosion from water and most chemicals.

Forcing Screws and
Accessories for Pullers

Center-Locating Punches
for Threaded Holes

Also known as transfer screws, these punches have a uniform shoulder height so you can quickly transfer multiple hole locations at once.

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Fasteners

Hex Head Screws

Socket Head Screws