M3 Nuts | McMaster-Carr

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System of Measurement

Thread Size

Nut Type

Material

Height

Thread Pitch

Hex Nut Profile

Width

Finish

Zinc Yellow-Chromate Plated

Thread Type

Metric

Metric Rounded Trapezoidal

Thread Direction

Specifications Met

Thread Spacing

Locking Type

Fastener Strength Grade/Class

Color

Fastener Strength Rating

REACH

RoHS

Compliant with Exemptions

Not Compliant

Washer Material

400 Series Stainless Steel

Performance

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

DFARS Specialty Metals

Compliant

Exempt

Not Compliant

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

1,027 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

44 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

15 products

Flange Nuts

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

7 products

Square Nuts

Flat sides won’t spin in channels and square holes

4 products

Cap Nuts

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

2 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

11 products

Coupling Nuts

Connect and extend threaded rods

8 products

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

1 product

Slotted Round Nuts

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

1 product

Socket Nuts

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

2 products

Press-Fit Nuts

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

38 products

Threaded Inserts

Create new threads or repair stripped threads

123 products

Weld Nuts

Weld to metal surfaces to add permanent threads

4 products

Rivet Nuts

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

8 products

Standoffs

Separate, position, or connect components in assemblies

506 products

Thread Adapters

Join threads of a different type, size, and gender

166 products

Thumb Screws

Tighten and loosen by hand without the need for tools

3 products

Press-Fit Nut Installation Tools

Everything you need to install press-fit nuts by hand

Building and Machinery Hardware

T-Slotted Framing and Fittings

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

6 products

Power Transmission

Lead Screw Collars

Position components and limit travel along a lead screw

2 products

Precision Lead Screws and Nuts

Pair with a motor for accurate starts and stops in automated motion and positioning applications

23 products