5-40 Fasteners | McMaster-Carr

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Stainless Steel

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External Square

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Partially Threaded

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Rounded Head Style

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Specifications Met

Thread Fit

Unified Standard Class 1A

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

RoHS

Compliant with Exemptions

DFARS Specialty Metals

REACH

Export Control Classification Number (ECCN)

Tensile Strength

30,000 psi to 99,999 psi

100,000 psi or greater

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410 Products

Fastening and Joining

Socket Head Screws

Socket Head Screws

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

Rounded Head Screws

Rounded Head Screws

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

Flat Head Screws

Flat Head Screws

Fit in countersunk holes for a flush finish

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

Tapping Screws

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

Locknuts

Hold fasteners in place to prevent loosening from vibration

Socket Nuts

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

Hex Nuts

Handle most general fastening needs

Easy to tighten and loosen by hand for making frequent adjustments

Flange Nuts

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

Coupling Nuts

Connect and extend threaded rods

Cap Nuts

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

Square Nuts

Flat sides won’t spin in channels and square holes

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

Threaded Inserts

Threaded Inserts

Create new threads or repair stripped threads

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