M3 Nuts | McMaster-Carr

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System of Measurement

Thread Size

Nut Type

Externally Threaded

Material

Stainless Steel

Hex Nut Profile

Height

Thread Pitch

Width

Finish

Black Zinc Plated

Dry Film Lubricated

Neoprene Coated

Phosphate Coated

Tin Zinc Plated

Zinc Yellow-Chromate Plated

Thread Direction

Thread Type

Metric Rounded Trapezoidal

Locking Type

Distorted Thread

Fastener Strength Grade/Class

Specifications Met

Thread Spacing

Color

Fastener Strength Rating

Performance

Chemical Resistant

Corrosion Resistant

Flame Retardant

High Temperature

Impact Resistant

Noncontaminating

Vibration Resistant

Drive Style

External Square

Washer Material

400 Series Stainless Steel

Thread Fit

Metric Class 4H

Metric Class 4H6H

Metric Class 6g

Metric Class 6G

Metric Class 6H

Unified Standard Class 2A

Unified Standard Class 2B

RoHS

Compliant with Exemptions

REACH

DFARS Specialty Metals

Export Control Classification Number (ECCN)

How can we improve?

1,005 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

Coupling Nuts

Connect and extend threaded rods

Slotted Round Nuts

Slotted Round Nuts

Fasten with a screwdriver in tight spots where there's no room for a wrench

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

Socket Nuts

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

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

Threaded Inserts

Threaded Inserts

Create new threads or repair stripped threads

Rivet Nuts

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

Weld Nuts

Weld to metal surfaces to add permanent threads

Standoffs

Threaded to separate or connect parts as well as position components in assemblies

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

Tighten and loosen by hand without the need for tools

Press-Fit Nut Installation Tools

Press-Fit Nut Installation Tools

Everything you need to install press-fit nuts by hand

Rivet Nut Tools

Rivet Nut Tools

Install rivet nuts

Building and Machinery Hardware

T-Slotted Framing and Fittings

T-Slotted Framing and Fittings

The most versatile system, attach fittings along the continuous slots to build virtually anything

Power Transmission

Lead Screws and Nuts

Lead Screws and Nuts

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

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