M3 Pins | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	Thread Size Thread Size	Show

	Thread Size Thread Size	Hide

	Length Length

	Diameter Diameter

4mm

5mm

	Shaft Diameter Shaft Diameter

3 mm

	Shaft Length Shaft Length

2.4 mm

6.4 mm

8.4 mm

	Material Material

Stainless Steel

Steel

	Head Type Head Type


Headless	Tapped

	Specifications Met Specifications Met

DIN

ISO

	Drive Style Drive Style

	Slotted

	Thread Length Thread Length

	Thread Pitch Thread Pitch

0.5 mm

	Thread Type Thread Type

Metric

	Threading Threading

Threaded on One End

Fully Threaded

	Pin Type Pin Type

	Dowel

	Shaft Type Shaft Type

	D-Profile

	End Shape End Shape

	Chamfered

	Shoulder Length Shoulder Length

	End Type End Type

	Plain

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	Shoulder Diameter Shoulder Diameter

4mm

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Thread Spacing Thread Spacing

Coarse

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56 Products

About Threaded Studs and Rods

About Shoulder Screws

The flat side of these pins relieves trapped air, making them easier to insert and remove from blind holes. One end is tapped and the other is chamfered for easy insertion. To remove, thread a screw or tool into the tapped hole, then pull them out. Use them as pivots, hinges, shafts, jigs, and fixtures to locate or hold parts. Pins are precision ground for accurate alignment. Breaking strength is measured as double shear, which is the force required to break a pin into three pieces.

Metric pins meet DIN standards.

For technical drawings and 3-D models, click on a part number.

Metric 303 Stainless Steel Pins

		Thread
Lg., mm	Dia. Tolerance, mm	Size	Pitch, mm	Min. Hardness	Breaking Strength, lbs.	Specifications Met		Each
4 mm Dia.
16	0.004 to 0.015	M3	0.5	Rockwell C18	101,000	DIN 7979C-m6	000000000	00000
20	0.004 to 0.015	M3	0.5	Rockwell C18	101,000	DIN 7979C-m6	000000000	0000
5 mm Dia.
10	0.004 to 0.015	M3	0.5	Rockwell C18	101,000	DIN 7979C-m6	000000000	0000
24	0.004 to 0.015	M3	0.5	Rockwell C18	101,000	DIN 7979C-m6	000000000	0000

Slotted Ball-Nose Spring Plungers

Without Thread Locker

With Thread Locker

Install these spring plungers with a screwdriver—they're slotted on one or both ends. The ball nose rolls to minimize wear and allow parts to move in and out of position.

Steel is strong and wear resistant.

440C stainless steel is hard, wear resistant, and mildly chemical resistant.

18-8 stainless steel is chemical resistant.

Plastic is chemical resistant and lightweight; nylon noses are extra soft to minimize marring soft surfaces such as aluminum.

Spring plungers without thread locker are for use in soft material such as aluminum, in extreme temperatures, and on parts requiring frequent assembly and removal.

Spring plungers with thread locker have a locking element that adds friction to resist loosening.

Extended nose force is the force required to begin to depress the nose. Compressed nose force is the force required to depress the nose flush with the body. When using a plunger as a detent or stop, a lighter nose force with a shallower hole releases more easily, while a heavier force with a deeper hole holds more securely.

For technical drawings and 3-D models, click on a part number.

Metric

Thread			Nose				Nose Force, lbs.
Size	Pitch, mm	Body Lg., mm	Extended Lg., mm	Dia., mm	Min. Temp., °F	Max. Temp., °F	Extended	Compressed	Choose a Locking Type		Each
Steel Body and 440C Stainless Steel Nose
M3	0.5	7	0.4	1.5	__	__	0.7	1	Thread Locker, Without Thread Locker	0000000	00000
Steel Body and Nylon Plastic Nose
M3	0.5	7	0.4	1.5	-20°	180°	0.7	1	Thread Locker, Without Thread Locker	0000000	0000
18-8 Stainless Steel Body and 440C Stainless Steel Nose
M3	0.5	7	0.4	1.5	__	__	0.7	1	Thread Locker, Without Thread Locker	00000000	0000
18-8 Stainless Steel Body and Nylon Plastic Nose
M3	0.5	7	0.4	1.5	-20°	180°	0.7	1	Thread Locker, Without Thread Locker	0000000	0000

Metric Partially Threaded Studs

Screw the threaded end of these metric studs into a tapped hole and use the unthreaded end as a pivot point, hinge, shaft, or locator pin. All can be installed and adjusted by hand or with a slotted screwdriver. These studs are steel for strength and wear resistance. They’re best for dry environments, since moisture will cause them to rust. All meet ISO 2342 (formerly DIN 427), an international standard for fastener dimensions.

For technical drawings and 3-D models, click on a part number.

		Shaft
Lg., mm	Thread Lg., mm	Lg., mm	Dia., mm	Dia. Tolerance, mm	Tensile Strength	Hardness	Drive Style	Specifications Met	Pkg. Qty.		Pkg.
Steel
M3 × 0.5 mm
6	3.6	2.4	3	-0.14 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	25	000000000	00000
10	3.6	6.4	3	-0.14 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	25	000000000	00000
12	3.6	8.4	3	-0.14 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	25	000000000	00000

Steel Press-Fit Studs

These steel studs are zinc plated to resist corrosion in wet environments. Press them into a drilled or punched hole with an arbor press or similar pressure tool. Also known as self-clinching studs, ribs under the head hold the stud firmly in place. Length listed is overall length.

For technical drawings and 3-D models, click on a part number.

Metric Zinc-Plated Steel
Lg., mm	Thread Pitch, mm	PEM® Part Number	Thread Lg., mm	Drill Bit Size	For Min. Material Thick., mm	For Min. Lg. Between Hole Center and Sheet Edge, mm	For Hole Dia., mm	Hole Size Tolerance, mm	Base Dia., mm	Tensile Strength	Hardness	Pkg. Qty.		Pkg.
M3
6	0.5	FH-M3-6	4	3.0 mm	1.000	5.5	3	0.000 to 0.08	5	Not Rated	Not Rated	50	000000000	000000
8	0.5	FH-M3-8	6	3.0 mm	1.000	5.5	3	0.000 to 0.08	5	Not Rated	Not Rated	50	000000000	00000
10	0.5	FH-M3-10	8	3.0 mm	1.000	5.5	3	0.000 to 0.08	5	Not Rated	Not Rated	50	000000000	00000
12	0.5	FH-M3-12	10	3.0 mm	1.000	5.5	3	0.000 to 0.08	5	Not Rated	Not Rated	50	000000000	00000
15	0.5	FH-M3-15	13	3.0 mm	1.000	5.5	3	0.000 to 0.08	5	Not Rated	Not Rated	50	000000000	00000
18	0.5	FH-M3-18	16	3.0 mm	1.000	5.5	3	0.000 to 0.08	5	Not Rated	Not Rated	50	000000000	00000
20	0.5	FH-M3-20	18	3.0 mm	1.000	5.5	3	0.000 to 0.08	5	Not Rated	Not Rated	25	000000000	0000
25	0.5	FH-M3-25	23	3.0 mm	1.000	5.5	3	0.000 to 0.08	5	Not Rated	Not Rated	25	000000000	00000

Stainless Steel Press-Fit Studs

18-8 stainless steel studs have good chemical resistance and may be mildly magnetic. Press them into a drilled or punched hole with an arbor press or similar pressure tool. Also known as self-clinching studs, ribs under the head hold the stud firmly in place. Length listed is overall length.

For technical drawings and 3-D models, click on a part number.

Metric 18-8 Stainless Steel
Lg., mm	Thread Pitch, mm	PEM® Part Number	Thread Lg., mm	Drill Bit Size, mm	For Min. Material Thick., mm	For Min. Lg. Between Hole Center and Sheet Edge, mm	For Hole Dia., mm	Hole Size Tolerance, mm	Base Dia., mm	Tensile Strength	Hardness	Pkg. Qty.		Pkg.
M3
6	0.5	FHS-M3-6	4	3.0	1.000	5.5	3	0.000 to 0.08	4.2	Not Rated	Not Rated	25	000000000	00000
8	0.5	FHS-M3-8	6	3.0	1.000	5.5	3	0.000 to 0.08	4.2	Not Rated	Not Rated	25	000000000	00000
10	0.5	FHS-M3-10	8	3.0	1.000	5.5	3	0.000 to 0.08	4.2	Not Rated	Not Rated	50	000000000	00000
12	0.5	FHS-M3-12	10	3.0	1.000	5.5	3	0.000 to 0.08	4.2	Not Rated	Not Rated	25	000000000	0000
15	0.5	FHS-M3-15	13	3.0	1.000	5.5	3	0.000 to 0.08	4.2	Not Rated	Not Rated	25	000000000	0000
18	0.5	FHS-M3-18	16	3.0	1.000	5.5	3	0.000 to 0.08	4.2	Not Rated	Not Rated	25	000000000	00000
20	0.5	FHS-M3-20	18	3.0	1.000	5.5	3	0.000 to 0.08	4.2	Not Rated	Not Rated	10	000000000	0000
25	0.5	FHS-M3-25	23	3.0	1.000	5.5	3	0.000 to 0.08	4.2	Not Rated	Not Rated	10	000000000	0000

Headless Alloy Steel Precision Shoulder Screws

Without a head to get in the way, these screws fit in tight spaces where standard shoulder screws cannot. Either thread them in a countersunk hole for a flush mount, or install them with the shoulder sticking out to use them as pins or dowels for aligning and locating components. With a shoulder diameter that is more precise than our general purpose shoulder screws, these screws are a good choice for measuring devices, optical fixtures, laboratory equipment, and other applications where precision matters. Made of alloy steel, they are strong and resist wear.

Metric screws meet DIN 927, an international standard for slotted shoulder screw dimensions.

For technical drawings and 3-D models, click on a part number.

4mm Shoulder Dia.—Precise Fit (-0.03mm to 0mm Dia. Tolerance)
Shoulder Lg.	Thread Size	Thread Pitch, mm	Thread Lg.	Specifications Met	Pkg. Qty.		Pkg.
3mm	M3	0.5	4.5mm	DIN 927	10	000000000	00000
4mm	M3	0.5	4.5mm	DIN 927	10	000000000	00000
5mm	M3	0.5	4.5mm	DIN 927	10	000000000	00000
6mm	M3	0.5	4.5mm	DIN 927	10	000000000	0000
8mm	M3	0.5	4.5mm	DIN 927	10	000000000	0000

Tapped Rounded Machine Keys

Thread a screw through the tapped hole to pop these keys out of a keyway. When installed, they fill oval keyways completely, reducing stress on the key and shaft. Using them in a closed keyway keeps them from sliding along the shaft axis. The rounded ends make it easy to slide gears, hubs, and other components into place. To install, press them in to place. Use them for permanent or high-torque applications, or to replace a key in a worn keyway. Keys are made of steel.

Undersized keys are good when you need a slightly looser fit or when you have an inconsistent keyway. Use them with parts you take apart frequently, such as for maintenance or prototyping. They meet DIN 6885 dimensional standards for undersized keys.

For technical drawings and 3-D models, click on a part number.

		Tolerance
Lg.	Tolerance Rating	Ht.	Wd.	Thread Size	Specifications Met		Each
1018-1045 Carbon Steel
5 mm × 5 mm
20mm	Undersized	-0.030mm to 0.000mm	-0.030mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	00000
25mm	Undersized	-0.030mm to 0.000mm	-0.030mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
40mm	Undersized	-0.030mm to 0.000mm	-0.030mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
6 mm × 6 mm
20mm	Undersized	-0.030mm to 0.000mm	-0.030mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
25mm	Undersized	-0.030mm to 0.000mm	-0.030mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
30mm	Undersized	-0.030mm to 0.000mm	-0.030mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
32mm	Undersized	-0.030mm to 0.000mm	-0.030mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
50mm	Undersized	-0.030mm to 0.000mm	-0.030mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
7 mm × 8 mm
20mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
28mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
30mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
32mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
36mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
40mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
45mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
50mm	Undersized	-0.090mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
8 mm × 10 mm
20mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
30mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
36mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
40mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
50mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000
56mm	Undersized	-0.036mm to 0.000mm	-0.036mm to 0.000mm	M3 × 0.5 mm	DIN 6885	000000000	0000

Threaded Plug Gauges

These have a go gauge on one end and a no-go gauge on the other end. They allow you to inspect internal threads on parts. A taperlock handle lets you quickly replace worn gauges.

Check the minimum internal thread size with the go gauge end, and check the maximum internal thread size with the no-go gauge end. A part is within tolerance if it’s easy to thread the go gauge into the part but difficult to thread the no-go gauge more than two turns.

Threads have different classes of fit. Thread fit designates the tightness or looseness of mating threads. For example, inch threads with a 3B fit have tighter tolerances than threads with a 2B fit.

For technical drawings and 3-D models, click on a part number.

Metric

Class X
Thread Size	Pitch	Pitch Dia. Tolerance	Hardness	Material	For Thread Fit		Each
M3	0.5mm	-0.005" to 0.005"	Rockwell C70	Chrome-Plated Tool Steel	Class 6H	000000000	0000000

Threaded Plug Gauges with Calibration Certificate

These gauges come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy. They allow you to inspect internal threads on parts. All have a go gauge on one end and a no-go gauge on the other end. A taperlock handle lets you quickly replace worn gauges.

Threads have different classes of fit. Thread fit designates the tightness or looseness of mating threads. For example, inch threads with a 3B fit have tighter tolerances than threads with a 2B fit.

For technical drawings and 3-D models, click on a part number.

Metric

					Class 6H
Thread Size	Pitch	Pitch Dia. Tolerance	Hardness	Material		Each
Class X
M3	0.5mm	-0.005" to 0.005"	Rockwell C70	Chrome-Plated Tool Steel	00000000	0000000

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About Threaded Studs and Rods

About Shoulder Screws

Flat-Vent Pull-Out Dowel Pins

Slotted Ball-Nose Spring Plungers

Metric Partially Threaded Studs

Steel Press-Fit Studs

Stainless Steel Press-Fit Studs

Headless Alloy Steel Precision Shoulder Screws

Tapped Rounded Machine Keys

Threaded Plug Gauges

Threaded Plug Gauges with Calibration Certificate