5-40 Nuts | McMaster-Carr

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Thread Size

4-40 to 5/16"-32

Nut Type

Material

Stainless Steel

Width

Hex Nut Profile

Height

Thread Direction

Locking Type

Thread Spacing

Finish

System of Measurement

Thread Type

Specifications Met

Performance

Corrosion Resistant

Vibration Resistant

Drive Style

External Square

DFARS Specialty Metals

Thread Fit

Unified Standard Class 2B

Export Control Classification Number (ECCN)

REACH

RoHS

Compliant with Exemptions

Fastener Strength Rating

Washer Material

Flange Diameter

Threading

Partially Threaded

Length

Cap Nut Profile

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43 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

Locknuts

Hold fasteners in place to prevent loosening from vibration

Flange Nuts

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

Square Nuts

Flat sides won’t spin in channels and square holes

Cap Nuts

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

Easy to tighten and loosen by hand for making frequent adjustments

Socket Nuts

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

Coupling Nuts

Connect and extend threaded rods

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

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.)