Acetal Dowel Pins | McMaster-Carr

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64 Products

Plastic Dowel Pins

Assemble circuit boards and other electronic parts with dowel pins that insulate against stray current. These pins prevent short circuits and electromagnetic interference (EMI) that can harm performance and cause malfunctions. They’re also lighter than metal pins if you need to reduce weight in prototypes and moving assemblies. Dowel pins are machined to tight tolerances and have a uniform diameter for a snug fit. Since they can be hard to remove, they are best for fixtures that don't need to be adjusted or taken apart frequently.

Plastic

Wear-Resistant Acetal—Slippery and wear resistant, these pins make excellent pivots. They're often used for automated machinery and other moving parts that create a lot of friction. They also prevent short circuits better than PEEK and polycarbonate plastic.

	Dia. Tolerance	Min. Hardness	Min. Temp.	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Wear-Resistant Acetal







			3/64" Diameter

			1/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	00000


			1/4"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
			3/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
			1/2"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000




					1/16" Diameter

					1/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000


					1/4"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
					3/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
					1/2"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000




							3/32" Diameter

							1/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000


							1/4"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
							3/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
							1/2"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000




									1/8" Diameter

									1/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000


									3/16"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
									1/4"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
									3/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
									1/2"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000




											3/16" Diameter

											1/4"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000


											3/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
											1/2"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
											3/4"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000




											13/64" Diameter

	1/2"	-0.005" to 0.005"									Rockwell M80	Not Rated	220	White	50	000000000	0000




											1/4" Diameter

											1/4"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000


											3/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
			1/2"								-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
			3/4"	-0.005" to 0.005"							Rockwell M80	Not Rated	220	White	50	000000000	0000




											5/16" Diameter

											3/8"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000


											1/2"	-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000
					3/4"						-0.005" to 0.005"	Rockwell M80	Not Rated	220	White	50	000000000	0000

Screw-Mount Locating and Support Buttons

Flat 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.

Round—Round buttons have an unthreaded, counterbored through hole. Mount them to a socket head cap screw.

	Lg.	Lg. Tolerance	For Mounting Screw Size	Mounting Fasteners Included		Each
Acetal—Round with Flat Head



	3/8"	3/8"	-0.005" to 0"	No. 6	No	0000000	00000


	1/2"	1/2"	-0.005" to 0"	No. 8	No	0000000	0000
	5/8"	1/2"	-0.005" to 0"	No. 8	No	0000000	0000
	3/4"	1/2"	-0.005" to 0"	No. 10	No	0000000	0000
	1"	1/2"	-0.005" to 0"	1/4"	No	0000000	0000

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.

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.	Thread Lg.	Material		Each
1/4"-20 Threads



	5/8"	1/2"	1/4"	Acetal	0000000	000000

Any-Angle Cone Supports

	Body Lg.	Arm Rotation	Thread Lg.	Body Material	Cone Material		Each
1/4"-20 Threads



	4 1/4"	4"	360°	1 1/8"	Steel	Acetal	0000000	000000

Adjustable-Height Sleeves

Adjustable-height sleeves convert standoffs with a fixed height into standoffs with an adjustable height. Slide them over your 1/2" diameter standoff and move the sleeve up or down to set your desired height. Lock them in place with the thumb screw.

	Dia.	Ht.	Material	Includes		Each
1/4"-20 Threads



	1/2"	1 1/8"	2"	Acetal	1/4"-20 Knurled Knob	0000000	000000

Trays

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

	Wd.	Ht.	Material		Each
For 1/4"-20 Thread



	17"	8"	1"	Acetal	0000000	0000000


	For M6 Thread



			432 mm	203 mm	25 mm	Acetal	0000000	000000


			For M8 Thread



					432 mm	203 mm	25 mm	Acetal	0000000	000000

Spring-Loaded Guide Plungers

As the face of these plungers is pushed in, their internal spring applies outward pressure to hold a workpiece in position against stops and rails. They’re also known as spring stops. These plungers make it easy to insert parts into your fixture or remove them, and they allow for slight variations in size from part to part. Mount them on flat surfaces.

Round Face


Triangular Base	Rectangular Base

Round face plungers hold curved and contoured surfaces.

Acetal Face—An acetal face is nonmarring to protect soft metal and polished surfaces.

			Base					Mounting Hole
	Face Dia.	Plunger Travel	Shape	Lg.	Wd.	Spring Force, lbf	Body Material	No. of	Dia.	Ctr.-to-Ctr. Wd.	Ctr.-to-Face Lg.	Mounting Fasteners Included		Each
Acetal Face



		0.38"	1/8"	Triangle	0.688"	0.875"	1.5 to 2.5	Aluminum	2	0.138"	0.656"	0.593"	No	0000000	00000


		0.38"	1/8"	Triangle	0.688"	0.875"	5.1 to 14.6	Aluminum	2	0.136"	0.656"	0.593"	No	0000000	0000
		0.56"	3/16"	Rectangle	1"	1.5"	2.3 to 25.8	Aluminum	2	0.203"	1.125"	0.875"	No	0000000	0000
		0.81"	1/4"	Rectangle	1.375"	2"	16.5 to 47.5	Aluminum	2	0.266"	1.5"	1.218"	No	0000000	00000

Square Face


Rectangular Base 2 Mounting Slots	2 Mounting Slots 2 Mounting Holes

Acetal Face—An acetal face is nonmarring to protect soft metal and polished surfaces.

2 Mounting Slots—Plungers with mounting slots can be fastened anywhere along the body, either through the slot or the hole. They also have an adjustable face—rotate it to point up, down, left, or right.

			Base					Mounting Slot				Mounting Hole
	Face Wd.	Plunger Travel	Shape	Lg.	Wd.	Spring Force, lbf	Body Material	No. of	Lg.	Wd.	Ctr.-to-Ctr. Wd.	No. of	Dia.	Ctr.-to-Ctr. Wd.	Ctr.-to-Face Lg.	Mounting Fasteners Included		Each
Acetal Face—Adjustable



		0.39"	1/8"	Rectangle	0.65"	0.866"	1.8 to 2.4	Zinc Alloy	2	0.307"	0.13"	0.551"	2	0.13"	0.551"	0.457"	No	00000000	00000


		0.39"	1/8"	Rectangle	0.65"	0.866"	2.5 to 4.5	Zinc Alloy	2	0.307"	0.13"	0.551"	2	0.13"	0.551"	0.457"	No	00000000	0000
		0.63"	3/16"	Rectangle	1.083"	1.25"	1.8 to 4.2	Zinc Alloy	2	0.606"	0.213"	0.827"	2	0.213"	0.827"	0.689"	No	00000000	00000
		0.63"	3/16"	Rectangle	1.083"	1.25"	4.3 to 10.1	Zinc Alloy	2	0.606"	0.213"	0.827"	2	0.213"	0.827"	0.689"	No	00000000	00000
		0.87"	5/16"	Rectangle	1.375"	1.5"	3.9 to 7.4	Zinc Alloy	2	0.787"	0.25"	1.063"	2	0.25"	1.063"	0.972"	No	00000000	00000
		0.87"	5/16"	Rectangle	1.375"	1.5"	6.1 to 16.8	Zinc Alloy	2	0.787"	0.25"	1.063"	2	0.25"	1.063"	0.972"	No	00000000	00000

Spring Locating Pins

Acetal Head

As the workpiece pushes against the pin head in one direction, the internal spring pushes back to hold it in place for clamping. Press into a drilled hole using the installation tool (sold separately). Also known as spring locating pins and side-thrust pins.

Acetal Head—Acetal-head pins won't mar soft metal and polished surfaces.

	Pins											Installation Tools
	Body		Head
	Dia.	Lg.	Dia.	Lg.	Max. Head Movement	Min. Spring Force, lbf	Max. Spring Force, lbf	Body Dia. Tolerance	Body Material		Each		Each
Acetal Head



		0.25"	0.28"	0.12"	0.16"	0.04"	2.3	2.5	0" to 0.0009"	Aluminum	0000000	00000	0000000	000000


		0.44"	0.38"	0.24"	0.41"	0.08"	13.5	14.8	0" to 0.0011"	Aluminum	0000000	0000	0000000	00000
		0.44"	0.43"	0.24"	0.43"	0.08"	9	9.9	0" to 0.0011"	Aluminum	0000000	0000	0000000	00000
		0.5"	0.51"	0.31"	0.53"	0.1"	11.3	12.4	0" to 0.0011"	Aluminum	0000000	0000	0000000	00000
		0.63"	0.67"	0.39"	0.64"	0.13"	22.5	24.8	0" to 0.0011"	Aluminum	0000000	0000	0000000	00000
		6 mm	7 mm	3 mm	4 mm	1 mm	2.3	2.5	0 mm to 0.022 mm	Aluminum	0000000	0000	0000000	00000
		10 mm	11 mm	5 mm	6.7 mm	1.6 mm	4.5	5	0 mm to 0.027 mm	Aluminum	0000000	0000	0000000	00000
		10 mm	11 mm	6 mm	10.7 mm	2 mm	9	9.9	0 mm to 0.027 mm	Aluminum	0000000	0000	0000000	00000
		12 mm	13 mm	8 mm	13.9 mm	2.6 mm	11.3	12.4	0 mm to 0.027 mm	Aluminum	0000000	0000	0000000	00000
		16 mm	17 mm	10 mm	16.7 mm	3.2 mm	22.5	24.8	0 mm to 0.027 mm	Aluminum	0000000	0000	0000000	00000