5-40 Nuts | McMaster-Carr

Filter by

System of Measurement

Thread Size

Material

Nut Type

Width

Hex Nut Profile

Height

Thread Direction

Thread Spacing

Finish

Locking Type

Thread Type

REACH Compliance

Drive Style

DFARS Compliance

Thread Fit

USMCA Qualifying

Thread Depth

Specifications Met

RoHS Compliance

Flange Diameter

Performance

Cap Nut Profile

How can we improve?

28 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

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