5/16"-18 Screws | McMaster-Carr

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3,945 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

Rounded Head Screws

Rounded Head Screws

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

Flat Head Screws

Flat Head Screws

Fit in countersunk holes for a flush finish

Shoulder Screws

Shoulder Screws

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

Carriage Bolts

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

Set Screws

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

Tighten and loosen by hand without the need for tools

Tapping Screws

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

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

Studs

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

Elevator Bolts

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

Square Head Screws

Square Head Screws

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

T-Bolts

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

Wood Screws

Fasten material to wood or pieces of wood to each other

Hold-Down Bolts

Hold-Down Bolts

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

Captive Panel Screws

Captive Panel Screws

Secure panels and enclosures while still having access to them

Binding Barrels and Screws

Binding Barrels and Screws

Thread together for a low-profile fastener

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

Anchors

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

Threaded Rods

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

Single-End Studs

Single-End Studs

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

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

Standoffs

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

Anchor Toggles

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

Anchor Installation Tools

Anchor Installation Tools

Drive with a hammer to expand and secure anchors in place

Fabricating and Machining

Locating Pin Lock Screws

Locating Pin Lock Screws

Secure removable locating pins

Drill Bushing Lock Screws

Drill Bushing Lock Screws

Prevent drill bushings from spinning

Setup Studs

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

T-Slot Nut and Setup Stud Kits

T-Slot Nut and Setup Stud Kits

Mount fixtures of different sizes to your machine table

Grippers

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

Clamps

Hold workpieces securely in place

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

Protective Feet

Protective Feet

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

T-Slotted Framing and Fittings

T-Slotted Framing and Fittings

The most versatile system, attach fittings along the continuous slots to build virtually anything

Material Handling

Eyebolts

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

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

Wheel Axles

Connect rotating wheels and support vehicles

Containers, Storage, and Furniture

Hanging Hooks

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

Facility and Grounds Maintenance

Toilet Mounts

Secure toilet components with flanges and hardware kits

Power Transmission

Connecting Rods

Connecting Rods

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

Measuring and Inspecting

Transfer Punches

Transfer Punches

Mark the center of an existing hole onto a separate workpiece

Fluid Handling

Float Rods

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

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