3/8"-24 Screws | McMaster-Carr

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Threaded on Both Ends

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Zinc Yellow-Chromate Plated

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Metric Rounded Trapezoidal

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30,000 psi to 99,999 psi

100,000 psi or greater

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Unified Standard Class 1A

Unified Standard Class 2A

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Unified Standard Class 3A

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1,059 Products

Fastening and Joining

Hex Head Screws

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

188 products

Socket Head Screws

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

93 products

Flat Head Screws

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

43 products

Rounded Head Screws

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

35 products

Set Screws

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

117 products

Shoulder Screws

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

80 products

12-Point Screws

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

16 products

T-Bolts

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

2 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

4 products

Spring Plungers

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

5 products

Threaded Rods

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

131 products

Thread Adapters

Join threads of a different type, size, and gender

193 products

Single-End Studs

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

13 products

Weld Nuts

Weld to metal surfaces to add permanent threads

29 products

Rivet Nuts

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

7 products

Fabricating and Machining

Lathe Tool Insert Holder Replacement Parts

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

1 product

Gear and Bearing Puller Forcing Screws

Replace forcing screws on gear and bearing pullers

1 product

Grippers

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

1 product

Power Transmission

Lead Screws and Nuts

Components travel along a screw with broad, square threads to clamp and lift heavy loads

7 products

Connecting Rods

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

75 products

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

3 products

Material Handling

Eyebolts

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

1 product

Jacks

Lift, hold, push, and position heavy objects

8 products

Measuring and Inspecting

Transfer Punches

Mark the center of an existing hole onto a separate workpiece

2 products