Full Groove Pins | McMaster-Carr

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73 Products

Fully Grooved Dowel Pins

With a tighter fit than standard dowel pins, these resist pulling from movement and vibration, even in imperfect holes. Three grooves pinch shut when installed, creating tension to lock in place. Also known as Type A pins.

For the best fit, drill your hole slightly larger than the nominal diameter shown.

Steel

Parallel Groove

Tapered Groove

Zinc-Plated Carbon Steel—These pins withstand occasional exposure to moisture. However, since friction from moving parts can wear away the finish, they're not ideal for wet environments. While not nearly as corrosion resistant as stainless steel, they are stronger and won’t deform under stress.

Parallel Groove—Fit tighter than pins with tapered grooves to stay in place under severe vibration. However, they require more force to insert.

Tapered Groove—Easier to install than pins with parallel grooves but less secure in high-vibration applications.

		Nominal		Max.
	Lg.	Dia.	Dia. Tolerance	Dia.	Dia. Tolerance	Groove Type	Double Shear Breaking Strength, lbf	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Carbon Steel





				3/32" Diameter
				1/4"	0.094"	-0.002" to 0"	0.101"	-0.003" to 0.003"	Tapered	850	Not Rated	—	25	000000000	000000
				1/2"	0.094"	-0.002" to 0"	0.101"	-0.003" to 0.003"	Tapered	850	Not Rated	—	25	000000000	00000



						1/8" Diameter
						1/2"	0.125"	-0.002" to 0"	0.134"	-0.003" to 0.003"	Tapered	1,600	Not Rated	—	25	000000000	00000
						3/4"	0.125"	-0.002" to 0"	0.134"	-0.003" to 0.003"	Tapered	1,600	Not Rated	—	25	000000000	00000
						1"	0.125"	-0.002" to 0"	0.133"	-0.003" to 0.003"	Tapered	1,600	Not Rated	—	25	000000000	00000



								5/32" Diameter
								1/2"	0.156"	-0.002" to 0"	0.166"	-0.003" to 0.003"	Tapered	2,300	Not Rated	—	25	000000000	00000
								3/4"	0.156"	-0.002" to 0"	0.166"	-0.003" to 0.003"	Tapered	2,300	Not Rated	—	25	000000000	00000
								1"	0.156"	-0.002" to 0"	0.165"	-0.003" to 0.003"	Tapered	2,300	Not Rated	—	25	000000000	00000



										3/16" Diameter
										1/2"	0.188"	-0.002" to 0"	0.198"	-0.003" to 0.003"	Tapered	3,300	Not Rated	—	25	000000000	00000
										3/4"	0.188"	-0.002" to 0"	0.198"	-0.003" to 0.003"	Tapered	3,300	Not Rated	—	25	000000000	00000
										1"	0.188"	-0.002" to 0"	0.198"	-0.003" to 0.003"	Tapered	3,300	Not Rated	—	10	000000000	0000
										1 1/2"	0.188"	-0.002" to 0"	0.197"	-0.003" to 0.003"	Tapered	3,300	Not Rated	—	10	000000000	00000



												1/4" Diameter
												3/4"	0.25"	-0.002" to 0"	0.263"	-0.003" to 0.003"	Tapered	5,800	Not Rated	—	25	000000000	00000
												1"	0.25"	-0.002" to 0"	0.263"	-0.003" to 0.003"	Tapered	5,800	Not Rated	—	25	000000000	00000
												1 1/4"	0.25"	-0.002" to 0"	0.263"	-0.003" to 0.003"	Tapered	5,800	Not Rated	—	10	000000000	0000
												1 1/2"	0.25"	-0.002" to 0"	0.262"	-0.003" to 0.003"	Tapered	5,800	Not Rated	—	10	000000000	00000



														5/16" Diameter
														3/4"	0.313"	-0.002" to 0"	0.329"	-0.003" to 0.003"	Tapered	7,600	Not Rated	—	10	000000000	0000
														1"	0.313"	-0.002" to 0"	0.329"	-0.003" to 0.003"	Tapered	7,600	Not Rated	—	10	000000000	0000
														1 1/4"	0.313"	-0.002" to 0"	0.329"	-0.003" to 0.003"	Tapered	7,600	Not Rated	—	10	000000000	0000



																3/8" Diameter
																1"	0.375"	-0.002" to 0"	0.394"	-0.003" to 0.003"	Tapered	11,000	Not Rated	—	10	000000000	00000



																		2 mm Diameter
																		14 mm	2 mm	-0.025 mm to 0 mm	2.15 mm	0 mm to 0.05 mm	Parallel	600	Rockwell B68	ISO 8740	10	00000000	0000
																		14 mm	2 mm	-0.025 mm to 0 mm	2.15 mm	0 mm to 0.05 mm	Tapered	600	Rockwell B68	ISO 8744	10	00000000	0000
																		16 mm	2 mm	-0.025 mm to 0 mm	2.15 mm	0 mm to 0.05 mm	Parallel	600	Rockwell B68	ISO 8740	10	00000000	0000



																				2.5 mm Diameter
																				12 mm	2.5 mm	-0.025 mm to 0 mm	2.7 mm	-0.05 mm to 0.05 mm	Tapered	950	Rockwell B68	ISO 8744	10	00000000	0000
																				18 mm	2.5 mm	-0.025 mm to 0 mm	2.65 mm	-0.05 mm to 0.05 mm	Tapered	950	Rockwell B68	ISO 8744	10	00000000	0000
																				20 mm	2.5 mm	-0.025 mm to 0 mm	2.65 mm	-0.05 mm to 0.05 mm	Tapered	950	Rockwell B68	ISO 8744	10	00000000	0000



		3 mm Diameter
		12 mm																		3 mm	-0.025 mm to 0 mm	3.2 mm	-0.05 mm to 0.05 mm	Parallel	1,400	Rockwell B68	ISO 8740	10	00000000	0000
		12 mm	3 mm																	-0.025 mm to 0 mm	3.3 mm	-0.05 mm to 0.05 mm	Tapered	1,400	Rockwell B68	ISO 8744	10	00000000	0000



																				4 mm Diameter
				10 mm																4 mm	-0.075 mm to 0 mm	4.3 mm	-0.05 mm to 0.05 mm	Tapered	1,400	Rockwell B68	ISO 8744	10	00000000	0000
				18 mm	4 mm															-0.075 mm to 0 mm	4.35 mm	-0.05 mm to 0.05 mm	Tapered	1,400	Rockwell B68	ISO 8744	10	00000000	0000
				20 mm	4 mm															-0.075 mm to 0 mm	4.25 mm	-0.05 mm to 0.05 mm	Parallel	2,500	Rockwell B68	ISO 8740	10	00000000	0000
				26 mm	4 mm															-0.075 mm to 0 mm	4.25 mm	-0.05 mm to 0.05 mm	Parallel	2,500	Rockwell B68	ISO 8740	10	00000000	0000
				30 mm	4 mm															-0.075 mm to 0 mm	4.25 mm	-0.05 mm to 0.05 mm	Parallel	2,500	Rockwell B68	ISO 8740	10	00000000	0000



						5 mm Diameter
						16 mm	5 mm													-0.075 mm to 0 mm	5.25 mm	-0.05 mm to 0.05 mm	Parallel	3,900	Rockwell B68	ISO 8740	10	00000000	0000
						45 mm	5 mm													-0.075 mm to 0 mm	5.25 mm	-0.05 mm to 0.05 mm	Tapered	3,900	Rockwell B68	ISO 8744	10	00000000	00000



																				6 mm Diameter
								20 mm												6 mm	-0.075 mm to 0 mm	6.3 mm	-0.05 mm to 0.05 mm	Parallel	5,700	Rockwell B68	ISO 8740	10	00000000	00000

Corrosion-Resistant Stainless Steel

Tapered Groove

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.

Tapered Groove—Easier to install than pins with parallel grooves but less secure in high-vibration applications.

		Nominal		Max.
	Lg.	Dia.	Dia. Tolerance	Dia.	Dia. Tolerance	Groove Type	Double Shear Breaking Strength	Min. Hardness	Pkg. Qty.		Pkg.
18-8 Stainless Steel





				3/32" Diameter
				1/4"	0.094"	-0.002" to 0"	0.101"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	10	000000000	00000
				1/2"	0.094"	-0.002" to 0"	0.101"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	10	000000000	00000



						1/8" Diameter
						1/2"	0.125"	-0.002" to 0"	0.134"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	10	000000000	00000
						3/4"	0.125"	-0.002" to 0"	0.134"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	10	000000000	00000
						1"	0.125"	-0.002" to 0"	0.133"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	10	000000000	00000



								5/32" Diameter
								1/2"	0.156"	-0.002" to 0"	0.166"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	00000
								3/4"	0.156"	-0.002" to 0"	0.166"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	00000
								1"	0.156"	-0.002" to 0"	0.165"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	00000



										3/16" Diameter
										1/2"	0.188"	-0.002" to 0"	0.198"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	10	000000000	00000
										3/4"	0.188"	-0.002" to 0"	0.198"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	10	000000000	00000
										1"	0.188"	-0.002" to 0"	0.198"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	10	000000000	00000
										1 1/2"	0.188"	-0.002" to 0"	0.197"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	0000



												1/4" Diameter
												3/4"	0.25"	-0.002" to 0"	0.263"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	0000
												1"	0.25"	-0.002" to 0"	0.263"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	00000
												1 1/4"	0.25"	-0.002" to 0"	0.263"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	00000
												1 1/2"	0.25"	-0.002" to 0"	0.262"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	00000



														5/16" Diameter
														1"	0.313"	-0.002" to 0"	0.329"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	00000
														1 1/4"	0.313"	-0.002" to 0"	0.329"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	00000



																3/8" Diameter
																1"	0.375"	-0.002" to 0"	0.394"	-0.003" to 0.003"	Tapered	Not Rated	Not Rated	5	000000000	0000

Fully Grooved Dowel Pins with Rounded Head

The domed head creates a finished appearance, so these pins are often used to attach brackets, knobs, and machine plates. The grooves pinch shut when you press pins into a hole, creating tension to lock them in place.

For the best fit, drill your hole slightly larger than the nominal diameter shown.

Steel

Parallel Groove—Fit tighter than pins with tapered grooves to stay in place under severe vibration. However, they require more force to insert.

		Nominal		Max.					Head
	Lg.	Dia.	Dia. Tolerance	Dia.	Dia. Tolerance	Groove Type	Double Shear Breaking Strength	Min. Hardness	Dia.	Ht.	Specs. Met		Each
Zinc-Plated Carbon Steel


		1/4"	0.086"	-0.002" to 0"	0.096"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.154"	0.065"	ASME B18.8.2	000000000	00000
		1/4"	0.104"	-0.002" to 0"	0.113"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.202"	0.08"	ASME B18.8.2	000000000	0000
		3/8"	0.086"	-0.002" to 0"	0.096"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.154"	0.065"	ASME B18.8.2	000000000	0000
		3/8"	0.104"	-0.002" to 0"	0.113"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.202"	0.08"	ASME B18.8.2	000000000	0000
		3/8"	0.12"	-0.002" to 0"	0.13"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.25"	0.097"	ASME B18.8.2	000000000	0000
		3/8"	0.144"	-0.002" to 0"	0.153"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.298"	0.113"	ASME B18.8.2	000000000	0000
		1/2"	0.086"	-0.002" to 0"	0.096"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.154"	0.065"	ASME B18.8.2	000000000	0000
		1/2"	0.104"	-0.002" to 0"	0.113"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.202"	0.08"	ASME B18.8.2	000000000	0000
		1/2"	0.12"	-0.002" to 0"	0.13"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.25"	0.097"	ASME B18.8.2	000000000	0000
		1/2"	0.144"	-0.002" to 0"	0.155"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.298"	0.113"	ASME B18.8.2	000000000	0000
		1/2"	0.161"	-0.002" to 0"	0.171"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.347"	0.13"	ASME B18.8.2	000000000	0000
		1/2"	0.196"	-0.002" to 0"	0.206"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.395"	0.146"	ASME B18.8.2	000000000	0000
		5/8"	0.12"	-0.002" to 0"	0.13"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.25"	0.097"	ASME B18.8.2	000000000	0000
		5/8"	0.144"	-0.002" to 0"	0.155"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.298"	0.113"	ASME B18.8.2	000000000	0000
		3/4"	0.161"	-0.002" to 0"	0.171"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.347"	0.13"	ASME B18.8.2	000000000	0000
		3/4"	0.196"	-0.002" to 0"	0.201"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.395"	0.146"	ASME B18.8.2	000000000	0000
		1"	0.161"	-0.002" to 0"	0.171"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.347"	0.13"	ASME B18.8.2	000000000	0000
		1"	0.196"	-0.002" to 0"	0.201"	-0.002" to 0.002"	Parallel	Not Rated	Not Rated	0.395"	0.146"	ASME B18.8.2	000000000	0000