M3 Bolts | McMaster-Carr

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System of Measurement

Thread Size

Length

Fastener Head Type

Material

Drive Style

Spring Plunger Driver

Tamper-Resistant Hex

Tamper-Resistant Torx

Threading

Threaded on Both Ends

Thread Pitch

Socket Head Profile

Finish

Titanium Carbon Nitride (TiCN) Coated

Zinc Flake Coated

Zinc Plated

Thread Type

Metric

Metric Rounded Trapezoidal

Specifications Met

Thread Spacing

Rounded Head Style

Fastener Strength Grade/Class

Flat Head Profile

Thread Direction

Tensile Strength

20,000 psi to 29,999 psi

30,000 psi to 99,999 psi

100,000 psi or greater

Not Rated

Screw Size

RoHS

Compliant

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

DFARS Specialty Metals

Compliant

Exempt

Not Compliant

Export Control Classification Number (ECCN)

1C998

2B999

EAR99

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

Yes

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2,089 Products

Fastening and Joining

Socket Head Screws

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

266 products

Rounded Head Screws

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

571 products

Flat Head Screws

Fit in countersunk holes for a flush finish that won't snag on surrounding parts

286 products

Hex Head Screws

Used with nuts to create a stronger joint than flat and rounded screws

43 products

Shoulder Screws

Rotate parts around the cylinder under the head to guide and align them during installation

268 products

Thumb Screws

Tighten and loosen by hand without the need for tools

32 products

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

202 products

Tapping Screws

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

16 products

Oval Head Screws

The domed top sits slightly above the surface of countersunk holes for a decorative look

17 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

15 products

Studs

Press, weld, or screw in place to add a threaded fastening point

16 products

Rivet Nuts

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

8 products

Weld Nuts

Weld to metal surfaces to add permanent threads

4 products

Single-End Studs

Use the unthreaded end as a pivot point, hinge, shaft, or locator pin

5 products

Threaded Rods

Anchor, connect, or hang components in a wide variety of applications

22 products

Standoffs

Separate, position, or connect components in assemblies

143 products

Thread Adapters

Join threads of a different type, size, and gender

117 products

Spring Plungers

Apply accurate, consistent pressure for positioning, indexing, and ejecting parts

4 products

Power Transmission

Lead Screw Collars

Position components and limit travel along a lead screw

2 products

Connecting Rods

Use with rod ends and swivel joints to link components in push/pull assemblies

6 products

Rod Ends

Use with connecting rods to support loads and control steering, tensioning, or pivoting motion

3 products

Precision Lead Screws and Nuts

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

23 products

Building and Machinery Hardware

T-Slotted Framing and Fittings

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

17 products

Cam Handles

For fast clamping, push down on the handle to draw two parts together

3 products