1/4"-28 Screws | McMaster-Carr

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Threaded on Both Ends

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Corrosion-Resistant Coated

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20,000 psi to 29,999 psi

30,000 psi to 99,999 psi

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Unified Standard Class 1A

Unified Standard Class 1B

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

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Right Hand and Left Hand

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Countersink Angle

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1,499 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

166 products

Hex Head Screws

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

177 products

Rounded Head Screws

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

173 products

Flat Head Screws

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

107 products

Set Screws

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

161 products

12-Point Screws

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

19 products

Shoulder Screws

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

144 products

Thumb Screws

Tighten and loosen by hand without the need for tools

37 products

Tapping Screws

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

5 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

14 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

4 products

Single-End Studs

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

11 products

Threaded Rods

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

123 products

Thread Adapters

Join threads of a different type, size, and gender

191 products

Weld Nuts

Weld to metal surfaces to add permanent threads

12 products

Rivet Nuts

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

7 products

Spring Plungers

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

25 products

Binding Barrel Posts

Pair with a cap or screw to create a custom low-profile fastener

5 products

Fabricating and Machining

Lathe Tool Insert Holder Replacement Parts

Replace clamps, screws, shims, and other parts in lathe tool insert holders

8 products

Grippers

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

14 products

Drills

Cut holes and drive screws with cordless, electric, air-powered, and manual drills

2 products

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

3 products

Power Transmission

Connecting Rods

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

63 products

Lead Screw Collars

Position components and limit travel along a lead screw

17 products

Measuring and Inspecting

Transfer Punches

Mark the center of an existing hole onto a separate workpiece

2 products

Material Handling

Eyebolts

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

4 products