1/4"-20 Bolts | McMaster-Carr

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Federal Specification

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Tensile Strength

10,000 psi to 19,999 psi

20,000 psi to 29,999 psi

30,000 psi to 99,999 psi

100,000 psi or greater

Screw Features

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ASME Interference Class 5

Metric Class 6g

Metric Class 6H

Unified Standard Class 1A

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Unified Standard Class 2B

Unified Standard Class 3A

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Compliant with Exemptions

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Export Control Classification Number (ECCN)

6,599 Products

Fastening and Joining

Hex Head Screws

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

899 products

Socket Head Screws

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

618 products

Rounded Head Screws

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

869 products

Flat Head Screws

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

527 products

Thumb Screws

Tighten and loosen by hand without the need for tools

228 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

12-Point Screws

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

25 products

Tapping Screws

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

150 products

Shoulder Screws

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

553 products

Elevator Bolts

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

59 products

Set Screws

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

348 products

Square Head Screws

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

17 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

12 products

Oval Head Screws

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

36 products

Studs

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

110 products

T-Bolts

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

2 products

Hold-Down Bolts

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

7 products

Joint Clamps for Wood

Make secure joints between boards, butcher blocks, and countertops

3 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

19 products

Wood Screws

Fasten material to wood or pieces of wood to each other

19 products

Binding Barrels

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

172 products

Threaded Rods

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

359 products

Thread Adapters

Join threads of a different type, size, and gender

303 products

Rivet Nuts

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

64 products

Weld Nuts

Weld to metal surfaces to add permanent threads

64 products

Standoffs

Separate, position, or connect components in assemblies

132 products

Standoff Caps

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

32 products

Single-End Studs

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

11 products

Anchors

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

76 products

Spring Plungers

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

136 products

Stud Welders

Join studs and pins to metal, leaving no marks on the back of the material

11 products

Magnets

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

10 products

Sockets

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

1 product

Material Handling

Eyebolts

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

93 products

Hoist Rings

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

6 products

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

6 products

U-Bolts

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

187 products

Routing Rings

Suspend wire and cable by feeding it through the eyehole

9 products

Routing Ring Bases

Temporarily attach routing rings to steel and iron surfaces with a magnet

1 product

Wheel Axles

Connect rotating wheels and support vehicles

2 products

Fabricating and Machining

T-Tracks

Versatile mounting tracks for jigs, fences, and other custom setups

4 products

Setup Studs

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

37 products

T-Slot Nuts

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

10 products

Fixture Clamps

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

16 products

Clamp Holding Screw Tips

Cover metal holding screws to protect workpieces from scratches

4 products

Clamp Holding Screws

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

10 products

Clamping Screws

Apply pressure through a flat-tipped screw to hold material in place

4 products

Facility and Grounds Maintenance

Toilet Mounts

Secure toilet components with flanges and hardware kits

4 products

Power Transmission

Rod Ends

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

72 products

Connecting Rods

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

24 products

Precision Lead Screws and Nuts

Pair with a motor for accurate starts and stops in automated motion and positioning applications

23 products

Building and Machinery Hardware

Cam Handles

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

10 products

T-Slotted Framing and Fittings

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

47 products

Electrical

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

1 product

Containers, Storage, and Furniture

Hanging Hooks

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

5 products