M8 Dowel Pins | McMaster-Carr

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51 Products

Pull-Out Dowel Pins

Remove pins even when you only have access to one end or they sit flush with the surface of your part. With one internally threaded end, they are easier to remove than most dowel pins. Thread a screw into the pin and then pull with the removal tool (sold separately). You can also pull the screw with pliers, but there’s more risk of damaging the hole.

Steel

High-Strength Alloy Steel—Our strongest, most wear-resistant pins, these won't bend or break from vibration. Use them for high-stress applications, such as mounting and aligning hydraulic cylinders and injection molds. They perform best in dry environments since moisture will cause them to rust.

								Each
	Lg., mm	Dia. Tolerance, mm	Thread Size	Double Shear Breaking Strength, lbf	Min. Hardness	Specs. Met		1-49	50-199	200-Up
High-Strength Alloy Steel







				16 mm Diameter

				32	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	00000	00000	00000


				36	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	0000	0000	0000
				40	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	0000	0000	0000
				50	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	0000	0000	0000
				60	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	0000	0000	0000
				70	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	0000	0000	0000

Pin Removal Tools

		Each
Puller Handle	000000000	000000
Tip for 3/4"-1-1/2" (13-20 mm) Diameter Pin	000000000	00000
Extension (5 1/2 Overall Length)	000000000	00000

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







				M8 × 1.25 mm

				16	9.6	6.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	10	000000000	000000


				18	9.6	8.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	5	000000000	00000
				20	9.6	10.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	10	000000000	00000
				25	9.6	15.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	10	000000000	00000
				30	9.6	20.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	10	000000000	00000
				35	9.6	25.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	5	000000000	00000
				40	9.6	30.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	5	000000000	0000

Steel Headless Slotted Precision Shoulder Screws

With no head, you can flush mount these screws in countersunk 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







	10 mm Diameter Shoulder (-0.07 mm to 0 mm Tolerance)

	16	M8 × 1.25 mm	11	Not Rated	DIN 927	1	000000000	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.

	Double Shear Breaking Strength, lbf	Min. Hardness	Specs. Met		Each
High-Strength Alloy Steel







	16 mm Diameter

	32	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	00000


	40	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	0000
	50	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	0000
	60	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	0000
	70	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	0000
	80	0.007 to 0.018	M8 × 1.25 mm	33,500	Rockwell C52	DIN 7979D-m6	000000000	0000

Pin Removal Tools

		Each
Puller Handle	000000000	000000
Tip for 3/4"-1-1/2" (13-20 mm) Diameter Pin	000000000	00000
Extension (5 1/2 Overall Length)	000000000	00000

Threaded Locating and Support Buttons

Flat Head

Domed Head

Use these buttons to support and position workpieces and fixtures from the bottom or side. Threading makes these buttons easier to replace than press-fit, so they are a good choice for high-wear applications. They’re also known as rest buttons.

Hardened Heat Treatment—Hardened steel buttons are stronger and resist wear better than steel buttons. They are precision ground, which helps them maintain their shape and size, even with repeated use. This makes them a good choice for use in modular fixtures where repeatability and exact positioning are important.

Domed Head—Buttons with a domed head support rounded or irregularly shaped workpieces with minimal contact.

Hex—Their hex shape lets you screw them into a threaded hole with a wrench or socket.

			Thread
	Lg., mm	Wd., mm	Size	Lg., mm	Lg. Tolerance, mm	Shape	Specs. Met		Each
Steel with Flat Head



		15	13	M8 × 1.25 mm	13	-0.2 to 0.2	Hex	DIN 6320	0000000	00000


		Hardened Steel with Flat Head



				10	17	M8 × 1.25 mm	10	-0.01 to 0.01	Hex	—	0000000	00000


				Hardened Steel with Domed Head



						10	17	M8 × 1.25 mm	10	-0.1 to 0.1	Hex	—	0000000	00000

Threaded Taper Pins

Tighten the

nut to draw

the pin out of

the hole.

Threads on these pins stick out for easy removal from blind holes. Tighten the hex nut to draw the pin out. Often used for positioning components and securing assemblies, they taper at a uniform rate to fit in tapered holes. For a snug fit, use a tapered drill bit that matches the pin number for inch sizes or the small end diameter for metric sizes. They have slightly rounded edges to aid insertion.

Metric

Length for metric pins measures the overall length, including the thread.

12L14 Carbon Steel—12L14 Carbon steel pins have good strength.

Breaking Strength—Breaking strength is measured as single shear, which is the force required to break the pin into two pieces.

	Thread Lg., mm	Thread Size	Min. Hardness	Breaking Strength, psi	Specs. Met	Pkg. Qty.		Pkg.
12L14 Carbon Steel







	8 mm Small End Diameter

	55	8.6	1:50	23.25	M8	Rockwell B80	34,500	DIN 7977, ISO 8737	5	000000000	000000


	60	8.7	1:50	23.25	M8	Rockwell B80	34,500	DIN 7977, ISO 8737	5	000000000	00000
	65	8.8	1:50	23.25	M8	Rockwell B80	34,500	DIN 7977, ISO 8737	5	000000000	00000
	70	8.9	1:50	23.25	M8	Rockwell B80	34,500	DIN 7977, ISO 8737	5	000000000	00000
	75	9	1:50	23.25	M8	Rockwell B80	34,500	DIN 7977, ISO 8737	5	000000000	00000


	303 Stainless Steel







					8 mm Small End Diameter

					55	8.6	1:50	23.25	M8	Rockwell B96	34,500	DIN 7977, ISO 8737	1	000000000	0000


					60	8.7	1:50	23.25	M8	Rockwell B96	34,500	DIN 7977, ISO 8737	1	000000000	0000
					65	8.8	1:50	23.25	M8	Rockwell B96	34,500	DIN 7977, ISO 8737	1	000000000	0000
					70	8.9	1:50	23.25	M8	Rockwell B96	34,500	DIN 7977, ISO 8737	1	000000000	0000
					75	9	1:50	23.25	M8	Rockwell B96	34,500	DIN 7977, ISO 8737	1	000000000	0000

Swiveling Locating and Support Buttons

The swiveling tip supports uneven and angled surfaces on workpieces and fixtures. These buttons screw into a threaded hole. Also known as rest buttons.

		Head, mm				Thread
	Tip Dia., mm	Lg.	Wd.	Tip-to-Head Lg., mm	Lg., mm	Size	Lg., mm	Range of Motion	Head Lg. Tolerance, mm	Load Cap., lb.	Tip Material		Each
Steel



		11	11	13	3	14	M8 × 1.25 mm	12	28°	-0.05 to 0.05	3,450	Stainless Steel	0000000	000000

Screw-Mount Locating and Support Buttons


	Flat Head	Hex	Domed Head

Also known as rest buttons, these buttons support workpieces and fixtures from the bottom or side. Mount them onto a screw or stud extending from your jig or table.

Hex—Hex buttons are easy to turn with a wrench. They have a threaded hole, so you can mount them to a threaded bolt or stud.

Domed Head—Those with a domed head support round or irregularly shaped workpieces with minimal contact.

	Lg., mm	Lg. Tolerance, mm	Thread Size	Mounting Fasteners Included		Each
Hardened Steel—Hex with Flat Head



	17	15	-0.01 to 0.01	M8 × 1.25 mm	No	0000000	000000


	Hardened Steel—Hex with Domed Head



			17	15	-0.1 to 0.1	M8 × 1.25 mm	No	0000000	00000

Threaded Hole Location Gauges

Find the true center of threaded holes to precisely align and measure parts. Once you thread these gauges into a hole, their cylinder sticks out as a reliable reference point. They’re often used with a coordinate measuring machine (CMM) to pinpoint the coordinates of the cylinder’s exact center. You can then use those coordinates to measure distances between points or reference them for error-free assembly. Even without a CMM, you can use these gauges with a micrometer to measure accurate center-to-center distances.

Thread Size	Thread Type	Hardness	Material		Each
M8 × 1 mm	Metric	Rockwell C60	Tool Steel	0000000	0000000
M8 × 1.25 mm	Metric	Rockwell C60	Tool Steel	0000000	000000

Fixturing for Parts Inspection

From towers and brackets to standoffs and supports, these components are the building blocks for your custom fixturing setup. They elevate parts so you can access a variety of angles for measuring and inspecting while protecting your measuring device from hitting the inspection table. You’ll often see them used with coordinate measuring machines (CMMs). They’re not for use in machining applications.

Angle Brackets

Angle brackets create a 90° mounting point, so you can secure small workpieces with supports. Shorter than towers, they’re a good choice for parts that are about the size of your palm. The base bolts into your surface, so these brackets won’t budge.

				Slots, mm
	Lg., mm	Wd., mm	Ht., mm	Lg.	Wd.	Number of Holes	Material	Includes		Each
M8 Hole Thread Size



		76	25	76	44	7.2	12	Aluminum	Two M8 Bolts	0000000	000000

Standoffs

Standoffs raise the height of towers and angle brackets or extend the reach of supports and clamps. Screw them into one another for added length.

	Material		Each
M8 × 1.25 mm Threads







	Fixed Standoff Height

	13	15	7.7	Steel	0000000	000000


	13	25	7.5	Steel	0000000	00000

Cone Supports

Cone supports have a round pointed tip to minimize contact with your workpiece, so they’re often used to prop up delicate parts. They’re also useful for parts with irregular surfaces that slide off larger supports. Made of plastic, they’re nonmarring.

	Ht., mm	Thread Lg., mm	Material		Each
M8 × 1.25 mm Threads



	16	13	7.7	Nylon	0000000	00000

Positioners

Positioners secure components anywhere along the length of their slot, similar to drop-in nuts on T-slotted rails. This gives you the flexibility to install components between the threaded holes on plates, brackets, and towers.

				Slots, mm
	Lg., mm	Wd., mm	Thk., mm	Lg.	Wd.	Number of Holes	Material	Includes		Each
M8 Hole Thread Size



		65	20	10	30	8.5	1	Steel	Two M8 Knurled Knobs	0000000	000000

Trays

Trays have slots to store and organize standoffs, supports, and other small components.

	Wd., mm	Ht., mm	Material		Each
For M8 Thread



	432	203	25	Acetal	0000000	0000000

Fixture Plates

Lay the foundation for your fixturing setup. These plates have a grid with evenly spaced threaded holes to install angle brackets and other fixturing components. They’re often used to help secure workpieces for measuring and inspecting. Just like a battleship gameboard, the edges are labeled with letters and numbers, making it easy to identify holes. While these lightweight plates aren’t for machining, you can use them for light fabrication jobs, such as laser marking. All can be attached to your table with clamps (not included), making them easy to remove and swap.

Fixture Plates

Anodized Aluminum—Anodized aluminum plates are often used with coordinate measuring machines (CMMs) and optical comparators. The coating protects them from scratches and wear, even when you’re working with heavy parts.

					Holes
	Lg., mm	Wd., mm	Thk., mm	Parallel Tolerance, mm	No. of	Ctr.-to-Ctr., mm	Material		Each
M8 Hole Thread Size



		300	300	13	0.635	289	15	Anodized Aluminum	0000000	0000000


		450	450	13	0.635	729	15	Anodized Aluminum	0000000	00000000

Clamps for Parts Inspection

With a light yet sturdy hold, these clamps help you keep workpieces in place hands-free for measuring and inspecting. Thread them right into your fixturing surface, whether it’s a plate, tower, or table. Because they apply less pressure than machining clamps, they won’t distort your parts, so you can take accurate measurements. While these clamps aren’t sturdy enough for use in machining, you can still use them for light fabrication work, such as laser engraving.

Hold-Down Clamps

Tension Spring

Hold-down clamps secure parts from the top.

Tension Spring—Tension spring clamps are the most common type of clamp. Slide the arm down the shaft until it touches the top of your workpiece. Since you apply pressure directly, using too much force might move your part.

	Material		Each
Tension Spring







	M8 × 1.25 mm Threads

	38	75	6.2	Aluminum	0000000	000000


	58	75	6.2	Aluminum	0000000	00000