5/16"-18 Bolts | McMaster-Carr

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10,000 psi to 19,999 psi

20,000 psi to 29,999 psi

30,000 psi to 99,999 psi

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4,127 Products

Fastening and Joining

Hex Head Screws

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

595 products

Socket Head Screws

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

351 products

Rounded Head Screws

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

330 products

Flat Head Screws

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

257 products

Carriage Bolts

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

136 products

Thumb Screws

Tighten and loosen by hand without the need for tools

153 products

12-Point Screws

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

24 products

Shoulder Screws

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

417 products

Tapping Screws

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

57 products

Elevator Bolts

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

49 products

Studs

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

82 products

Set Screws

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

263 products

Square Head Screws

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

20 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

4 products

Oval Head Screws

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

9 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

7 products

Wood Screws

Fasten material to wood or pieces of wood to each other

5 products

Binding Barrels and Screws

Thread together for a low-profile fastener

73 products

Threaded Rods

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

267 products

Rivet Nuts

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

45 products

Weld Nuts

Weld to metal surfaces to add permanent threads

40 products

Thread Adapters

Join threads of a different type, size, and gender

265 products

Anchors

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

43 products

Standoff Caps

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

52 products

Standoffs

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

1 product

Single-End Studs

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

11 products

Spring Plungers

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

80 products

Magnets

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

7 products

Sockets

Turn fasteners with an external drive style without slipping and damaging the drive

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

Setup Studs

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

29 products

T-Slot Nuts

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

14 products

Fixture Kits

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

1 product

Fixture Clamps

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

11 products

Clamp Holding Screws

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

9 products

Clamp Holding Screw Tips

Cover metal holding screws to protect workpieces from scratches

3 products

Facility and Grounds Maintenance

Toilet Mounts

Secure toilet components with flanges and hardware kits

7 products

Material Handling

Eyebolts

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

79 products

Hoist Rings

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

18 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

U-Bolts

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

124 products

Routing Rings

Suspend wire and cable by feeding it through the eyehole

2 products

Building and Machinery Hardware

T-Slotted Framing and Fittings

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

33 products

Cam Handles

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

9 products

Power Transmission

Rod Ends

Use with connecting rods to support loads and control steering, tensioning, or pivoting motion

48 products

Connecting Rods

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

18 products

Containers, Storage, and Furniture

Hanging Hooks

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

7 products

Electrical

Battery Terminal Fasteners

Replace bolts in battery terminals

2 products