5/16"-18 Screws | McMaster-Carr

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20,000 psi to 29,999 psi

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4,275 Products

Fastening and Joining

Socket Head Screws

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

352 products

Hex Head Screws

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

722 products

Rounded Head Screws

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

336 products

Flat Head Screws

Fit in countersunk holes for a flush finish that won't snag on surrounding parts

257 products

Shoulder Screws

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

468 products

Carriage Bolts

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

139 products

Set Screws

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

266 products

Tapping Screws

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

61 products

Thumb Screws

Tighten and loosen by hand without the need for tools

156 products

12-Point Screws

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

28 products

Studs

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

73 products

Elevator Bolts

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

49 products

Square Head Screws

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

20 products

Oval Head Screws

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

9 products

T-Bolts

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

1 product

Hold-Down Bolts

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

10 products

Wood Screws

Fasten material to wood or pieces of wood to each other

5 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

7 products

Rivet Nuts

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

48 products

Weld Nuts

Weld to metal surfaces to add permanent threads

40 products

Binding Barrels

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

75 products

Standoff Caps

Create a finished look on standoffs and protect them from dirt and debris

52 products

Standoffs

Separate, position, or connect components in assemblies

1 product

Thread Adapters

Join threads of a different type, size, and gender

363 products

Anchors

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

43 products

Threaded Rods

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

267 products

Spring Plungers

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

80 products

Single-End Studs

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

11 products

Anchor Toggles

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

1 product

Magnets

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

7 products

Anchor Installation Tools

Drive with a hammer to expand and secure anchors in place

1 product

Fabricating and Machining

Locating Pin Lock Screws

Secure removable locating pins

2 products

Drill Bushing Lock Screws

Prevent drill bushings from spinning

6 products

Fixture Clamps

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

12 products

Setup Studs

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

36 products

Fixture Kits

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

2 products

Grippers

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

5 products

Clamp Holding Screws

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

9 products

Clamping Screw Mounting Bases

Thread clamping screw clamps into the holes to hold workpieces

1 product

Clamping Screw Clamps

Mount in a base or through a threaded hole, then tighten the tip to hold a workpiece in place

1 product

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

114 products

T-Slotted Framing Fasteners

Secure brackets and other accessories to T-slotted rails

16 products

Leveling Mounts

Level machines and workbenches on uneven surfaces, reduce vibration, and protect floors

4 products

Protective Feet

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

2 products

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

1 product

Material Handling

Eyebolts

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

79 products

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

4 products

Wheel Axles

Connect rotating wheels and support vehicles

2 products

Containers, Storage, and Furniture

Hanging Hooks

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

7 products

Facility and Grounds Maintenance

Toilet Mounts

Secure toilet components with flanges and hardware kits

7 products

Fluid Handling

Float Rods

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

4 products

Power Transmission

Connecting Rods

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

18 products

Measuring and Inspecting

Transfer Punches

Mark the center of an existing hole onto a separate workpiece

2 products