M8 Dowel Pins | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	Thread Size Thread Size	Show

	Thread Size Thread Size	Hide

	Thread Pitch Thread Pitch

1.25 mm

	Length Length

	Diameter Diameter

16mm

	Head Type Head Type


Tapped	Threaded

Headless

	Material Material

Steel

Stainless Steel

Aluminum

	Shaft Diameter Shaft Diameter

8 mm

	Thread Length Thread Length

	Shaft Type Shaft Type


Plain	Tapered

D-Profile

	Shaft Length Shaft Length

	Specifications Met Specifications Met

ISO

DIN

	End Shape End Shape


Chamfered	Rounded

	Mount Type Mount Type

	Threaded Stud

	Shoulder Diameter Shoulder Diameter

10mm

	Pin Type Pin Type

	Dowel
	Taper

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
Compliant

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant

RoHS Compliant with
Exemptions

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

REACH Compliant

	Shape Shape

	Hex

	Shoulder Length Shoulder Length

16mm

	End Type End Type

	Plain

	Width Width

13mm

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About Shoulder Screws

About Threaded Studs and Rods

One end of these pins is tapped, and the other is chamfered for easy insertion. To remove, thread a screw or tool into the tapped hole, then pull the pin out. Because they aren't vented, they work best in through holes. 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 7979D-m6 specifications.

Steel pins have good strength.

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

Metric 52100 Alloy Steel Pins

		Thread
Lg., mm	Dia. Tolerance, mm	Size	Pitch, mm	Min. Hardness	Breaking Strength, lbs.	Specifications Met		Each
16 mm Dia.
32	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	00000
36	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	0000
40	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	0000
50	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	0000
60	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	0000
70	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	0000

Optional Insertion and Removal Tools

Use with internally threaded dowel pins. A complete tool requires a puller handle and a tip that fits your pin. You’ll also need a socket head cap screw that can thread into the pin. To use, thread a tip into the puller handle and fit the other end of the tip over the screw. Slide the weight along the handle to push or pull.

Component	For Pin Dia.	Overall Lg.		Each
Puller Handle	__	12 1/4"	000000000	000000
Tip	3/4"-1 1/2" (13-20 mm)	__	000000000	00000
Optional Extension	__	5 1/2"	000000000	00000

Flat-Vent Pull-Out Dowel Pins

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.

Steel pins have good strength.

Use puller handles, tips, and optional extensions (sold separately) with some internally threaded dowel pins to create insertion and removal tools. A complete tool requires a puller handle and a tip that fits your pin. You’ll also need a socket head cap screw that can thread into the pin. To use, thread a tip into the puller handle and fit the other end of the tip over the screw. Slide the weight along the handle to push or pull.

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

Metric 52100 Alloy Steel Pins

Pins
		Thread							Puller Handles		Tips		Optional Extensions
Lg., mm	Dia. Tolerance, mm	Size	Pitch, mm	Min. Hardness	Breaking Strength, lbs.	Specifications Met		Each		Each		Each		Each
16 mm Dia.
32	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	00000	000000000	000000	000000000	000000	000000000	000000
40	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	0000	000000000	00000	000000000	00000	000000000	00000
50	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	0000	000000000	00000	000000000	00000	000000000	00000
60	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	0000	000000000	00000	000000000	00000	000000000	00000
70	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	0000	000000000	00000	000000000	00000	000000000	00000
80	0.007 to 0.018	M8	1.25	Rockwell C52	33,500	DIN 7979D-m6	000000000	0000	000000000	00000	000000000	00000	000000000	00000

Threaded Taper Pins

Tighten the nut to draw the pin out of the hole.

Metric

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.

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

Steel pins have good strength. Pins that meet ASME B18.8.2 specifications conform to ASME standards for material and dimensions.

18-8 stainless steel pins offer a balance of strength and corrosion resistance. They may be mildly magnetic.

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

Metric—12L14 Carbon Steel

8mm Small End Dia.
Lg., mm	Large End Dia., mm	Rate of Taper	Thread Lg., mm	Thread Size	Min. Hardness	Breaking Strength, lbs./sq. in.	Specifications Met	Pkg. Qty.		Pkg.
55	8.6	1 mm per 50 mm	23.25	M8	Rockwell B80	34,500	DIN 7977, ISO 8737	5	000000000	000000
60	8.7	1 mm per 50 mm	23.25	M8	Rockwell B80	34,500	DIN 7977, ISO 8737	5	000000000	00000
65	8.8	1 mm per 50 mm	23.25	M8	Rockwell B80	34,500	DIN 7977, ISO 8737	5	000000000	00000
70	8.9	1 mm per 50 mm	23.25	M8	Rockwell B80	34,500	DIN 7977, ISO 8737	5	000000000	00000
75	9	1 mm per 50 mm	23.25	M8	Rockwell B80	34,500	DIN 7977, ISO 8737	5	000000000	00000

Metric—303 Stainless Steel

8mm Small End Dia.
Lg., mm	Large End Dia., mm	Rate of Taper	Thread Lg., mm	Thread Size	Min. Hardness	Breaking Strength, lbs./sq. in.	Specifications Met	Pkg. Qty.		Pkg.
55	8.6	1 mm per 50 mm	23.25	M8	Rockwell B96	34,500	DIN 7977, ISO 8737	1	000000000	00000
60	8.7	1 mm per 50 mm	23.25	M8	Rockwell B96	34,500	DIN 7977, ISO 8737	1	000000000	0000
65	8.8	1 mm per 50 mm	23.25	M8	Rockwell B96	34,500	DIN 7977, ISO 8737	1	000000000	0000
70	8.9	1 mm per 50 mm	23.25	M8	Rockwell B96	34,500	DIN 7977, ISO 8737	1	000000000	0000
75	9	1 mm per 50 mm	23.25	M8	Rockwell B96	34,500	DIN 7977, ISO 8737	1	000000000	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
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	00000
20	9.6	10.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	10	000000000	0000
25	9.6	15.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	10	000000000	0000
30	9.6	20.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	10	000000000	0000
40	9.6	30.4	8	-0.22 to 0	Not Rated	Rockwell B75	Slotted	DIN 427, ISO 2342	5	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.

10mm Shoulder Dia.—Precise Fit (-0.07mm to 0mm Dia. Tolerance)
Shoulder Lg.	Thread Size	Thread Pitch, mm	Thread Lg.	Specifications Met	Pkg. Qty.		Pkg.
16mm	M8	1.25	11mm	DIN 927	1	000000000	00000

Threaded Locating and Support Buttons

Use these buttons to support and position workpieces and fixtures from the bottom or side. Their hex shape lets you screw them into a threaded hole with a wrench or socket. 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.

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

Metric

		Thread
Lg., mm	Wd., mm	Size	Lg., mm	Lg. Tolerance, mm	Specifications Met		Each
Steel
15	13	M8	13	-0.2 to 0.2	DIN 6320	0000000	00000

Inspection and Measuring Fixturing

Use these components in coordinate measuring machine (CMM) applications to raise a workpiece and reliably position it on a fixture plate with 1/4"-20 holes. They are not for use in machining applications.

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

Hold-Down Clamps

Hold-Down Clamp

Hold-down clamps thread directly into a fixture plate, tower, or compatible component. Slide the clamp down its shaft and press into place against the workpiece for a light hold. They're also known as tension spring clamps.

		Thread
Reach	Ht.	Size	Pitch, mm	Lg.	Material		Each
Standard
38mm	75mm	M8	1.25	6.223mm	Aluminum	0000000	000000
58mm	75mm	M8	1.25	6.223mm	Aluminum	0000000	00000