5/8"-18 Screws | McMaster-Carr

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Partially Threaded

Threaded on Both Ends

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Stainless Steel

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Phosphate Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

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Metric Rounded Trapezoidal

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External 12-Point

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Less than 10,000 psi

30,000 psi to 99,999 psi

100,000 psi or greater

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Right Hand and Left Hand

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Unified Standard Class 1A

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

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424 Products

Fastening and Joining

Hex Head Screws

Hex Head Screws

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

Socket Head Screws

Socket Head Screws

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

Flat Head Screws

Flat Head Screws

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

Set Screws

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

Shoulder Screws

Shoulder Screws

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

12-Point Screws

12-Point Screws

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

Rounded Head Screws

Rounded Head Screws

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

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

Threaded Rods

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

Weld Nuts

Weld to metal surfaces to add permanent threads

Material Handling

Screw Jack End Fittings

Screw Jack End Fittings

Thread onto screw jacks to create pivot points with clevis rod ends and other linkages

Jacks

Lift, hold, push, and position heavy objects

Screw Jack Mounts

Screw Jack Mounts

Stabilize screw jacks to support loads

Eyebolts

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

Power Transmission

Precision Lead Screw Nuts

Precision Lead Screw Nuts

Pair with precision lead screws for accurate starts and stops in your assembly

Connecting Rods

Connecting Rods

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

Fabricating and Machining

Gear and Bearing Puller Forcing Screws

Gear and Bearing Puller Forcing Screws

Replace forcing screws on gear and bearing pullers

Measuring and Inspecting

Transfer Punches

Transfer Punches

Mark the center of an existing hole onto a separate workpiece

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)