M3 Pins | McMaster-Carr

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DFARS Specialty Metals

64 Products

Single-End Studs

Screw the threaded end of these studs into a tapped hole, and use the unthreaded end as a pivot point, hinge, shaft, or locator pin.

Steel—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.

			Shaft, mm
	Lg., mm	Thread Lg., mm	Lg.	Dia.	Dia. Tolerance	Tensile Strength	Hardness	Drive Style	Specs. 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	97493A111	000000


				10	3.6	6.4	3	-0.14 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	25	97493A112	00000
				12	3.6	8.4	3	-0.14 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	25	97493A113	00000
				16	3.5	12.5	3	-0.14 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	10	97493A151	00000
				18	3.5	14.5	3	-0.14 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	10	97493A152	00000

Vented Pull-Out Dowel Pins

Insert and remove from blind holes with less effort than pins that aren't vented. The vent relieves trapped air, so pressure doesn't create resistance as you install the pin. Because they have a tapped end, you can thread in a screw and pull the pin out with a removal tool (sold separately). You can also pull using pliers, but there’s more risk of damaging the hole.

Flat Shaft

The flat side of these pins creates a vent that's less likely to be blocked than a spiral shaft, but doesn’t offer quite as strong of a hold.

18-8 Stainless Steel—The choice for wet and outdoor environments. In addition to resisting rust, these pins also withstand mild chemicals such as cleaners and degreasers. They are strong enough to join most components but won't withstand extreme stress and vibration as well as steel.

	Double Shear Breaking Strength, lbf	Min. Hardness	Specs. Met		Each
18-8 Stainless Steel







	4 mm Diameter

	16	0.004 to 0.015	M3 × 0.5 mm	101,000	Rockwell C18	DIN 7979C-m6	98432A111	00000


	20	0.004 to 0.015	M3 × 0.5 mm	101,000	Rockwell C18	DIN 7979C-m6	98432A112	00000




			5 mm Diameter

			10	0.004 to 0.015	M3 × 0.5 mm	101,000	Rockwell C18	DIN 7979C-m6	98432A113	0000


			24	0.004 to 0.015	M3 × 0.5 mm	101,000	Rockwell C18	DIN 7979C-m6	98432A114	00000

Steel Headless Slotted Precision Shoulder Screws

With no head, you can flush mount these screws in counterbored holes and tight spaces. You can also use them as pins for aligning parts. They are engineered to tight tolerances for assemblies that require smooth and accurate movement, with shoulder diameters twice as precise as those on standard-fit screws. Hand-tighten with a slotted screwdriver to avoid damaging the drive.

	Tensile Strength	Specs. Met	Pkg. Qty.		Pkg.
Alloy Steel







	4 mm Diameter Shoulder (-0.03 mm to 0 mm Tolerance)

	3	M3 × 0.5 mm	4.5	Not Rated	DIN 927	10	94128A101	00000


	4	M3 × 0.5 mm	4.5	Not Rated	DIN 927	10	94128A102	0000
	5	M3 × 0.5 mm	4.5	Not Rated	DIN 927	10	94128A103	0000
	6	M3 × 0.5 mm	4.5	Not Rated	DIN 927	10	94128A104	0000
	8	M3 × 0.5 mm	4.5	Not Rated	DIN 927	10	94128A105	0000

Ball-Nose Spring Plungers

Align, position, and lock moving parts for most machining and assembly tasks. These spring plungers have a spring-loaded ball that compresses when a part presses against it, and then pops out into a notch or groove to hold the part in place. Unlike long-nose spring plungers, the ball rolls easily in and out of position, so they're a great fit for applications that require consistent, smooth movement, such as positioning parts in an assembly line and aligning fixtures and jigs when cutting or drilling.

Spring plungers are available with or without a threadlocker. Those with a threadlocker won't wiggle loose from vibration. Spring plungers without a threadlocker are easier to remove.

440C Stainless Steel Nose—The strongest, most wear-resistant stainless steel noses, these grind against hard metal surfaces without denting or scratching. However, they are not as corrosion resistant as 316 stainless steel.

Nylon Nose—Extra soft to avoid scratching delicate surfaces. Nylon is best for use on soft materials, such as aluminum. It will swell and weaken when exposed to moisture, however, so it should only be used in dry environments.

		Nose, mm		Nose Force, lbf		Body		Drive Style
	Thread Size	Extended Lg.	Dia.	Extended	Compressed	Material	Lg., mm	Front	Back		Each
440C Stainless Steel Nose



		M3 x 0.5 mm	0.4	1.5	0.7	1	18-8 Stainless Steel	7	Spring Plunger Driver	Slotted	85015A31	00000


		M3 x 0.5 mm	0.4	1.5	0.7	1	Black-Oxide Steel	7	Spring Plunger Driver	Slotted	3391A65	0000


		Nylon Nose



				M3 x 0.5 mm	0.4	1.5	0.7	1	18-8 Stainless Steel	7	Spring Plunger Driver	Slotted	2277A65	0000


				M3 x 0.5 mm	0.4	1.5	0.7	1	Steel	7	Spring Plunger Driver	Slotted	2191A25	0000

Press-Fit Studs

Press these studs 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.

Zinc-Plated Steel—The most common choice for areas with occasional exposure to moisture.

18-8 Stainless Steel—The choice for wet and outdoor environments, these studs resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	For Min. Material Thk., mm	For Min. Lg. Between Hole Ctr. and Sheet Edge, mm	For Hole Dia., mm	Hole Size Tolerance, mm	Drill Bit Size, mm	Base Dia., mm	Tensile Strength	Hardness	Pkg. Qty.		Pkg.
Zinc-Plated Steel







	M3 × 0.5 mm

	6	FH-M3-6	4	1.000	5.5	3	0.000 to 0.08	3.0	5	Not Rated	Not Rated	50	93580A576	00000


	8	FH-M3-8	6	1.000	5.5	3	0.000 to 0.08	3.0	5	Not Rated	Not Rated	50	93580A577	0000
	10	FH-M3-10	8	1.000	5.5	3	0.000 to 0.08	3.0	5	Not Rated	Not Rated	50	93580A578	0000
	12	FH-M3-12	10	1.000	5.5	3	0.000 to 0.08	3.0	5	Not Rated	Not Rated	50	93580A579	0000
	15	FH-M3-15	13	1.000	5.5	3	0.000 to 0.08	3.0	5	Not Rated	Not Rated	50	93580A581	0000
	18	FH-M3-18	16	1.000	5.5	3	0.000 to 0.08	3.0	5	Not Rated	Not Rated	50	93580A582	0000
	20	FH-M3-20	18	1.000	5.5	3	0.000 to 0.08	3.0	5	Not Rated	Not Rated	25	93580A583	0000
	25	FH-M3-25	23	1.000	5.5	3	0.000 to 0.08	3.0	5	Not Rated	Not Rated	25	93580A584	0000


	18-8 Stainless Steel







					M3 × 0.5 mm

					6	FHS-M3-6	4	1.000	5.5	3	0.000 to 0.08	3.0	4.2	Not Rated	Not Rated	25	93580A695	0000


					8	FHS-M3-8	6	1.000	5.5	3	0.000 to 0.08	3.0	4.2	Not Rated	Not Rated	25	93580A696	0000
					10	FHS-M3-10	8	1.000	5.5	3	0.000 to 0.08	3.0	4.2	Not Rated	Not Rated	50	93580A697	0000
					12	FHS-M3-12	10	1.000	5.5	3	0.000 to 0.08	3.0	4.2	Not Rated	Not Rated	25	93580A698	0000
					15	FHS-M3-15	13	1.000	5.5	3	0.000 to 0.08	3.0	4.2	Not Rated	Not Rated	25	93580A699	0000
					18	FHS-M3-18	16	1.000	5.5	3	0.000 to 0.08	3.0	4.2	Not Rated	Not Rated	25	93580A701	0000
					20	FHS-M3-20	18	1.000	5.5	3	0.000 to 0.08	3.0	4.2	Not Rated	Not Rated	10	93580A702	0000
					25	FHS-M3-25	23	1.000	5.5	3	0.000 to 0.08	3.0	4.2	Not Rated	Not Rated	10	93580A703	0000

Quick-Release Pins for Blind Holes

Often used to position and hold parts during assembly and inspection, mate these pins with a receptacle to secure them in blind holes. Install the receptacle (sold separately) in the hole so you can insert the pin to join components. Three retaining balls lock pins in place until released.

Twist Knob

No button to hold down, these pins secure and release with just a quarter turn of the knob.

Nickel-Plated Carbon Steel—With a durable finish, these pins resist rust, salt water, and mild chemicals.

	Quick-Release Pins												Receptacles
	Dia., mm	Usable Lg., mm	For Panel Thk., mm	Mounting Flange Dia., mm	Double Shear Breaking Strength	Min. Hardness	Handle Color	Handle Material	Ball Material	Mounting Fasteners Included		Each		Each
Nickel-Plated Carbon Steel



		10	10.5	6 to 14	34	Not Rated	Not Rated	Black	Plastic	Stainless Steel	Yes	97580A312	000000	99802A212	000000

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 Tolerance—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.

			Tolerance, mm
	Lg., mm	Tolerance Rating	Ht.	Wd.	Min. Hardness	Thread Size	Specs. Met		Each
1018-1045 Carbon Steel







				5 mm × 5 mm

				20	Undersized	-0.030 to 0.000	-0.030 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A101	00000


				25	Undersized	-0.030 to 0.000	-0.030 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A103	0000
				40	Undersized	-0.030 to 0.000	-0.030 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A108	0000




						6 mm × 6 mm

						20	Undersized	-0.030 to 0.000	-0.030 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A112	0000


						25	Undersized	-0.030 to 0.000	-0.030 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A114	0000
						30	Undersized	-0.030 to 0.000	-0.030 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A115	0000
						32	Undersized	-0.030 to 0.000	-0.030 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A116	0000
						50	Undersized	-0.030 to 0.000	-0.030 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A123	0000




								7 mm × 8 mm

								20	Undersized	-0.090 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A124	0000


								28	Undersized	-0.090 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A127	0000
								30	Undersized	-0.090 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A128	0000
								32	Undersized	-0.090 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A129	0000
								36	Undersized	-0.090 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A131	0000
								40	Undersized	-0.090 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A132	0000
								45	Undersized	-0.090 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A133	0000
								50	Undersized	-0.090 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A135	0000




										8 mm × 10 mm

										20	Undersized	-0.036 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A137	0000


										30	Undersized	-0.036 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A142	0000
										36	Undersized	-0.036 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A144	0000
										40	Undersized	-0.036 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A146	0000
										50	Undersized	-0.036 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A149	0000
										56	Undersized	-0.036 to 0.000	-0.036 to 0.000	Not Rated	M3 × 0.5 mm	DIN 6885	90164A151	0000

Go/No-Go Threaded Plug Gauges with Handle

Speed up thread tolerance checks—the handle on these gauges gives you a good grip to quickly thread and unthread go or no-go gauges. Use these gauges to make sure nuts, tapped holes, and other parts fall within tolerance. All are precisely manufactured to confirm thread fit. If the plug gauges wear down, you can insert new ones (not included) onto the taperlock handle.

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.

Go/no-go gauges have both a go gauge on one end of the handle and a no-go gauge on the other to speed up tests. Go gauges check the minimum internal thread size. No-go gauges check the maximum internal thread size.

Class X Gauge

Double-Ended Taperlock

Handle

Calibration Certificate Traceable to NIST—Gauges with a calibration certificate traceable to NIST were calibrated in a lab. The certificate, sometimes called a test report or long-form certificate, details the tested measurements.

For Metric Class 6H Thread Fit—These metric-threaded gauges are class 6H, which is comparable to the fit of those with Class 2B Unified Standard.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads.

	Thread Type	Pitch Dia. Tolerance, mm	Hardness	Material	Features	For Thread Fit		Each
Go/No-Go Gauges



	M3 × 0.5 mm	Metric	-0.005 to 0.005	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	23585A111	0000000


	Go/No-Go Gauges with Calibration Certificate Traceable to NIST



			M3 × 0.5 mm	Metric	-0.005 to 0.005	Rockwell C70	Chrome-Plated Tool Steel	Double-Ended Taperlock Handle	Metric Class 6H	3206A115	000000

Threaded Plug Gauges

Test if internal threads fall within tolerance. These plug gauges are often used in nuts and tapped holes to confirm thread fit. For precision and accuracy, they’re manufactured to tight tolerances.

Threads are within tolerance if it’s easy to thread a go gauge but difficult to thread a no-go gauge more than two turns.

Class X Gauge

Go Gauge—Go gauges check the minimum hole diameter.

No-Go Gauge—No-go gauges check the maximum hole diameter.

Accuracy Certificate Traceable to NIST—Gauges with an accuracy certificate traceable to NIST include verification from the manufacturer that their thread sizes are within tolerance. The certificate is also known as a certificate of compliance or a short-form certification.

For Metric Class 6H Thread Fit—For metric threads, the higher the class number, the looser the fit. Class 6H is the metric standard and works for most applications.

For Thread Fit—Thread fit designates the tightness or looseness of mating threads.

	Thread Type	Pitch Dia. Tolerance	Hardness	Material	For Thread Fit		Each
Go Gauges



	M3 × 0.5 mm	Metric	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N35	000000


	Go Gauges with Accuracy Certificate Traceable to NIST



			M3 × 0.5 mm	Metric	0" to 0.0002"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N125	00000


			No-Go Gauges



					M3 × 0.5 mm	Metric	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N79	00000


					No-Go Gauges with Accuracy Certificate Traceable to NIST



							M3 × 0.5 mm	Metric	-0.0002" to 0"	Rockwell C70	Chrome-Plated Tool Steel	Metric Class 6H	7968N169	00000