1/4"-20 Fasteners | McMaster-Carr

Filter by

System of Measurement

Thread Size

Length

Material

Drive Style

Tamper-Resistant Torx

Tamper-Resistant Torx Plus

Fastener Head Type

Threading

Threaded on Both Ends

Finish

Cadmium Yellow-Chromate Plated

Chrome Plated

Copper Plated

Corrosion-Resistant Coated

Dyed

Galvanic Barrier Coated

Galvanized

Glazed

Hot-Dipped Galvanized

Head Diameter

Thread Direction

Right Hand and Left Hand

Head Height

Socket Head Profile

Thread Type

Rounded Head Style

Thread Spacing

Specifications Met

Federal Specification

Drive Size

Fastener Strength Grade/Class

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

Flat Head Profile

Thread Fit

ASME Interference Class 5

Metric Class 6g

Metric Class 6H

Unified Standard Class 1A

Unified Standard Class 1B

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

DFARS Specialty Metals

RoHS

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

8,350 Products

Fastening and Joining

Rounded Head Screws

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

868 products

Socket Head Screws

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

613 products

Hex Head Screws

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

931 products

Flat Head Screws

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

526 products

Tapping Screws

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

150 products

Thumb Screws

Tighten and loosen by hand without the need for tools

231 products

Shoulder Screws

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

559 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

348 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

Elevator Bolts

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

59 products

Studs

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

101 products

Joint Clamps for Wood

Make secure joints between boards, butcher blocks, and countertops

3 products

T-Bolts

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

2 products

Oval Head Screws

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

36 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

12 products

Square Head Screws

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

17 products

Wood Screws

Fasten material to wood or pieces of wood to each other

19 products

Hold-Down Bolts

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

7 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

19 products

Hex Nuts

Handle most general fastening needs

116 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

71 products

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

12 products

Flange Nuts

The flange distributes pressure, so you don't need a washer

38 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

52 products

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

32 products

Coupling Nuts

Connect and extend threaded rods

25 products

Push-Button Nuts

Disengage the threads to quickly slide along threaded rods

3 products

Square Nuts

Flat sides won’t spin in channels and square holes

10 products

Split Nuts

Swivel to attach at any point on a threaded rod for quick installation

2 products

Socket Nuts

Install in recessed holes and tight spots where a wrench won’t fit; also known as Allen nuts

2 products

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

1 product

Clip-On Nuts

Slide onto the edge of thin panels to create a fastening point

10 products

Threaded Inserts

Create new threads or repair stripped threads

292 products

Rivet Nuts

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

63 products

Dowel Nuts

Form joints in blind holes in wood

5 products

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

27 products

Screw-Mount Nuts

Mount with screws, rivets, and nails to add threads to a surface

9 products

Tube-Connecting Nuts

Push inside tubes to join them with a threaded stud instead of welding

12 products

Weld Nuts

Weld to metal surfaces to add permanent threads

64 products

Adhesive-Mount Nuts

Attach threads to material that’s too thin for a threaded insert

18 products

Push Nuts

Press onto threads for a light duty hold that’s faster to install than typical nuts

4 products

Snap-In Nuts

Push into square holes in thin materials to add bolts for aligning off-center parts

12 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

Anchors

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

76 products

Standoffs

Separate, position, or connect components in assemblies

326 products

Standoff Caps

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

32 products

Thread Adapters

Join threads of a different type, size, and gender

419 products

Single-End Studs

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

11 products

Quick-Release Pins

Fasten or remove components on equipment with a spring-loaded retaining ball

5 products

Dowel Pins

Align parts before assembly or use as a pivot, shaft, or hinge to join moving components

101 products

Taper Pins

Fit snugly into tapered holes to secure, position, and align components

Install and remove blind, solid, hollow, and other types of rivets

1 product

Threaded Insert Installation Tools

Install helical, key-locking, slotted-drive, and other threaded inserts

54 products

Anchor Installation Tools

Drive with a hammer to expand and secure anchors in place

5 products

Magnets

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

10 products

Building and Machinery Hardware

T-Slotted Framing Fasteners

Secure brackets and other accessories to T-slotted rails

47 products

T-Slotted Framing Structural Brackets

Join T-slotted rail surfaces and corners to build virtually any structure

81 products

T-Slotted Framing Braces

Reinforce joined corners of T-slotted rails for a sturdier connection than structural brackets

16 products

Strut Channel Nuts

Fasten on threaded rod to connect components to strut channel

35 products

Knobs

Position, tighten, and secure fixtures and equipment

115 products

Cam Handles

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

12 products

Indicating Knobs

Control devices and view settings at a glance

4 products

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

2 products

Machine Handles

Arms give you extra leverage to secure and position jigs, fixtures, and other equipment

1 product

Protective Plugs

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

1 product

Leveling Mount Inserts

Slip onto equipment and furniture to add threaded-stud leveling feet

7 products

Material Handling

U-Bolts

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

187 products

U-Bolt Plates

Reinforce mounted U-bolts for a more secure hold

51 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

Routing Clamps

Secure routed lines of pipe, tubing, and conduit

168 products

Eyebolts

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

93 products

Turnbuckles

Twist the body or end fittings to adjust the length and tension of attached rope and chain

62 products

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

6 products

Hoist Rings

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

6 products

Rope Cleats

Temporarily secure rope

1 product

Fabricating and Machining

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

22 products

Setup Studs

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

37 products

Toggle Clamps

Lock workpieces onto worktables or objects

36 products

C-Clamps

Temporarily secure workpieces together or to a work surface

9 products

Clamping Screw Clamps

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

6 products

Clamping Screw Mounting Bases

Thread clamping screw clamps into the holes to hold workpieces

1 product

Power Transmission

Rod Ends

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

62 products

Connecting Rods

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

24 products

Linear Drive Nuts

Create a linear positioning system on a rotary shaft without a lead screw

3 products

Precision Lead Screws and Nuts

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

23 products

Electrical Power, Networking, and Controlling

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

1 product

Fluid Handling

Float Rods

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

11 products