R-Pins | McMaster-Carr

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Hairpin Cotter Pins

Secure components more quickly than standard cotter pins. One prong is already bent, so just push into a hole for installation in one step. Although hairpins are reusable, they don’t withstand vibration as well as standard and hammer-set cotter pins. Also known as hitch pin clips and R-clips.

Steel

Zinc-Plated Spring 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.

Spring Steel—Stronger than stainless steel, these pins won't deform from stress and vibration. They perform best in dry environments since moisture will cause them to rust.

	For Clevis Pin Dia.	Wire Dia.	Eye Dia.	Lg.	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Spring Steel



		1/16" to 1/8"	3/64"	1/8"	7/16"	—	100	000000000	000000


		7/64" to 9/64"	1/32"	1/8"	7/16"	—	100	000000000	00000
		1/8"	1/32"	1/8"	5/8"	—	100	000000000	0000
		1/8" to 5/32"	1/32"	1/8"	9/16"	—	25	000000000	0000
		1/8" to 3/16"	3/64"	1/8"	5/8"	—	100	000000000	0000
		3/16" to 1/4"	3/64"	1/8"	3/4"	—	25	000000000	0000
		3/16" to 1/4"	3/64"	1/4"	15/16"	—	100	000000000	0000
		1/4" to 5/16"	1/16"	1/4"	1 1/8"	—	100	000000000	0000
		1/4" to 3/8"	3/64"	1/8"	7/8"	—	25	000000000	0000
		1/4" to 3/8"	3/64"	1/4"	1 9/16"	—	100	000000000	00000
		1/4" to 3/8"	5/64"	1/4"	1 3/16"	—	50	000000000	0000


		1/4" to 1/2"	1/16"	1/4"	1 5/16"	—	100	000000000	00000
		1/4" to 1/2"	3/32"	3/8"	1 5/8"	—	100	000000000	00000
		5/16" to 3/8"	5/64"	1/8"	1 1/16"	—	25	000000000	0000
		5/16" to 3/8"	5/64"	1/4"	1 7/16"	—	100	000000000	00000
		5/16" to 3/8"	3/32"	3/8"	1 5/8"	—	50	000000000	00000
		5/16" to 3/8"	7/64"	1/8"	1 1/4"	—	25	000000000	0000
		5/16" to 1/2"	3/32"	5/8"	2"	—	25	000000000	0000
		3/8" to 7/16"	3/32"	5/8"	1 7/8"	—	100	000000000	00000
		3/8" to 1/2"	1/16"	3/8"	1 9/16"	—	25	000000000	0000
		3/8" to 1/2"	5/64"	3/8"	1 9/16"	—	100	000000000	00000


		3/8" to 5/8"	3/32"	5/8"	2 5/16"	—	100	000000000	00000
		7/16" to 3/4"	1/8"	1/2"	2 9/16"	—	50	000000000	00000
		1/2" to 5/8"	1/8"	5/8"	2 3/8"	—	50	000000000	00000
		1/2" to 3/4"	3/32"	1/2"	2 1/2"	—	50	000000000	00000
		1/2" to 3/4"	1/8"	3/8"	1 15/16"	—	50	000000000	00000
		1/2" to 3/4"	1/8"	1/2"	1 9/16"	—	25	000000000	0000
		5/8" to 3/4"	9/64"	3/4"	2 9/16"	—	50	000000000	00000
		5/8" to 7/8"	1/8"	5/8"	2 1/2"	—	50	000000000	00000
		5/8" to 1"	9/64"	3/4"	2 15/16"	—	25	000000000	00000
		5/8" to 1"	11/64"	7/8"	3 1/4"	—	25	000000000	00000


		3/4" to 1 1/16"	11/64"	7/8"	3 1/2"	—	10	000000000	00000
		3/4" to 1 1/8"	1/8"	1"	3 1/8"	—	25	000000000	00000
		3/4" to 1 1/8"	9/64"	3/4"	3 5/16"	—	25	000000000	00000
		7/8" to 1"	11/64"	1"	3 3/4"	—	25	000000000	00000
		7/8" to 1"	5/16"	7/8"	4 1/16"	—	5	000000000	00000
		7/8" to 1 1/16"	5/32"	7/8"	2 3/16"	—	25	000000000	00000
		7/8" to 1 1/4"	11/64"	7/8"	3 3/4"	—	25	000000000	00000
		1 1/8" to 1 1/2"	15/64"	1 1/8"	5"	—	10	000000000	00000
		1 1/8" to 1 1/2"	1/4"	7/8"	4"	—	10	000000000	00000
		6 mm to 11 mm	2 mm	10 mm	50 mm	—	5	000000000	0000


		9 mm to 14 mm	2 mm	10 mm	57 mm	DIN 11024	10	000000000	0000
		9 mm to 14 mm	2.5 mm	10 mm	50 mm	—	5	000000000	0000
		10 mm to 16 mm	3 mm	18 mm	72 mm	DIN 11024	5	000000000	0000
		10 mm to 16 mm	3.5 mm	18 mm	70 mm	—	5	000000000	0000
		16 mm to 20 mm	4 mm	20 mm	74 mm	DIN 11024	5	000000000	0000
		16 mm to 20 mm	4 mm	21 mm	85 mm	—	5	000000000	0000
		16 mm to 26 mm	4.5 mm	21 mm	82 mm	—	10	000000000	0000
		20 mm to 28 mm	5 mm	24 mm	85 mm	—	5	000000000	00000
		20 mm to 28 mm	5 mm	24 mm	102 mm	DIN 11024	5	000000000	00000
		28 mm to 40 mm	6 mm	24 mm	105 mm	—	5	000000000	00000

28 mm to 40 mm	6 mm	30 mm	126 mm	DIN 11024	1	000000000	0000
28 mm to 45 mm	7 mm	30 mm	105 mm	—	1	000000000	0000
28 mm to 45 mm	7 mm	30 mm	127 mm	DIN 11024	1	000000000	0000
30 mm to 45 mm	8 mm	28 mm	110 mm	—	1	000000000	0000
30 mm to 45 mm	8 mm	28 mm	132 mm	DIN 11024	1	000000000	0000

Spring Steel



		3/16" to 1/4"	3/64"	1/8"	3/4"	—	25	000000000	0000


		3/16" to 1/4"	3/64"	1/4"	1"	—	25	000000000	0000
		1/4" to 3/8"	3/64"	1/8"	7/8"	—	25	000000000	0000
		1/4" to 3/8"	3/64"	1/4"	1 9/16"	—	100	000000000	00000
		1/4" to 3/8"	5/64"	1/4"	1 3/16"	—	100	000000000	00000
		1/4" to 1/2"	1/16"	1/4"	1 5/16"	—	100	000000000	00000
		1/4" to 1/2"	3/32"	3/8"	1 5/8"	—	100	000000000	00000
		5/16" to 3/8"	5/64"	1/8"	1 1/16"	—	25	000000000	0000
		5/16" to 3/8"	7/64"	1/8"	1 1/4"	—	25	000000000	0000
		5/16" to 1/2"	3/32"	5/8"	2"	—	25	000000000	0000
		3/8" to 1/2"	1/16"	3/8"	1 9/16"	—	25	000000000	0000


		3/8" to 1/2"	5/64"	3/8"	1 9/16"	—	100	000000000	00000
		3/8" to 5/8"	3/32"	5/8"	2 5/16"	—	50	000000000	0000
		7/16" to 3/4"	1/8"	1/2"	2 9/16"	—	50	000000000	00000
		1/2" to 3/4"	3/32"	1/2"	2 1/2"	—	50	000000000	00000
		1/2" to 3/4"	1/8"	3/8"	1 15/16"	—	50	000000000	00000
		5/8" to 7/8"	1/8"	5/8"	2 1/2"	—	25	000000000	0000
		5/8" to 7/8"	3/16"	5/8"	2 1/2"	—	1	000000000	0000
		5/8" to 1"	9/64"	3/4"	2 15/16"	—	25	000000000	00000
		5/8" to 1"	11/64"	7/8"	3 1/4"	—	25	000000000	00000
		3/4" to 1"	1/4"	7/8"	4"	—	10	000000000	00000


		3/4" to 1 1/16"	11/64"	7/8"	3 1/2"	—	10	000000000	0000
		3/4" to 1 1/8"	9/64"	3/4"	3 5/16"	—	25	000000000	00000
		7/8" to 1"	5/16"	7/8"	4 1/16"	—	5	000000000	00000
		7/8" to 1 1/16"	5/32"	7/8"	2 3/16"	—	25	000000000	00000
		7/8" to 1 1/4"	11/64"	7/8"	3 3/4"	—	25	000000000	00000
		1 1/4" to 1 1/2"	1/4"	1 1/2"	5 1/8"	—	5	000000000	00000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these pins resist rusting. They are strong enough to join most components but won't withstand extreme stress and vibration as well as steel.

Highly-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these pins won't degrade when exposed to harsh weather, salt water, and most chemicals. They're strong enough to join most components but won't withstand extreme stress and vibration as well as steel.

	For Clevis Pin Dia.	Wire Dia.	Eye Dia.	Lg.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		1/16" to 1/8"	3/64"	1/8"	7/16"	—	100	000000000	000000


		7/64" to 9/64"	1/32"	1/8"	7/16"	—	100	000000000	00000
		1/8"	1/32"	1/8"	5/8"	—	100	000000000	0000
		1/8" to 3/16"	3/64"	1/8"	5/8"	—	50	000000000	00000
		3/16" to 1/4"	3/64"	1/8"	3/4"	—	25	000000000	00000
		3/16" to 1/4"	3/64"	1/4"	15/16"	—	100	000000000	0000
		1/4" to 5/16"	1/16"	1/4"	1 1/8"	—	100	000000000	00000
		1/4" to 3/8"	3/64"	1/4"	1 9/16"	—	25	000000000	00000
		1/4" to 3/8"	5/64"	1/4"	1 3/16"	—	25	000000000	00000
		1/4" to 1/2"	1/16"	1/4"	1 5/16"	—	25	000000000	00000
		1/4" to 1/2"	3/32"	3/8"	1 5/8"	—	25	000000000	00000


		5/16" to 3/8"	5/64"	1/8"	1 1/16"	—	25	000000000	00000
		5/16" to 3/8"	5/64"	1/4"	1 7/16"	—	50	000000000	00000
		5/16" to 3/8"	3/32"	3/8"	1 5/8"	—	25	000000000	00000
		5/16" to 3/8"	7/64"	1/8"	1 1/4"	—	10	000000000	00000
		5/16" to 1/2"	3/32"	5/8"	2"	—	10	000000000	00000
		3/8" to 7/16"	3/32"	5/8"	1 7/8"	—	25	000000000	00000
		3/8" to 1/2"	1/16"	3/8"	1 9/16"	—	10	000000000	00000
		3/8" to 1/2"	5/64"	3/8"	1 9/16"	—	25	000000000	00000
		3/8" to 5/8"	3/32"	5/8"	2 5/16"	—	25	000000000	00000
		7/16" to 3/4"	1/8"	1/2"	2 9/16"	—	10	000000000	00000


		1/2" to 5/8"	1/8"	5/8"	2 3/8"	—	10	000000000	00000
		1/2" to 3/4"	3/32"	1/2"	2 1/2"	—	25	000000000	00000
		1/2" to 3/4"	1/8"	3/8"	1 15/16"	—	10	000000000	0000
		1/2" to 3/4"	1/8"	1/2"	1 9/16"	—	10	000000000	00000
		5/8" to 3/4"	9/64"	3/4"	2 9/16"	—	10	000000000	00000
		5/8" to 7/8"	1/8"	5/8"	2 1/2"	—	10	000000000	00000
		5/8" to 7/8"	3/16"	5/8"	2 5/8"	—	1	000000000	0000
		5/8" to 1"	9/64"	3/4"	2 15/16"	—	5	000000000	00000
		5/8" to 1"	11/64"	7/8"	3 1/4"	—	5	000000000	00000
		3/4" to 1"	1/4"	7/8"	4"	—	1	000000000	0000


		3/4" to 1 1/16"	11/64"	7/8"	3 1/2"	—	1	000000000	0000
		3/4" to 1 1/8"	1/8"	5/8"	2 7/8"	—	5	000000000	00000
		3/4" to 1 1/8"	1/8"	1"	3 1/8"	—	5	000000000	00000
		3/4" to 1 1/8"	9/64"	3/4"	3 5/16"	—	10	000000000	00000
		7/8" to 1"	11/64"	1"	3 3/4"	—	5	000000000	00000
		7/8" to 1 1/4"	11/64"	7/8"	3 3/4"	—	1	000000000	0000
		1 1/4" to 1 1/2"	1/4"	1 1/2"	5 1/8"	—	1	000000000	00000
		9 mm to 14 mm	2 mm	10 mm	57 mm	DIN 11024	1	000000000	0000
		10 mm to 16 mm	3 mm	18 mm	72 mm	DIN 11024	1	000000000	0000
		16 mm to 20 mm	4 mm	20 mm	74 mm	DIN 11024	1	000000000	0000


		20 mm to 28 mm	5 mm	24 mm	102 mm	DIN 11024	1	000000000	00000
		28 mm to 40 mm	6 mm	30 mm	126 mm	DIN 11024	1	000000000	00000


		Highly-Corrosion-Resistant 316 Stainless Steel



				1/16" to 1/8"	3/64"	1/8"	7/16"	—	25	000000000	0000


7/64" to 9/64"	1/32"			1/8"	7/16"	—	25	000000000	0000
1/8" to 5/32"	1/32"			1/8"	9/16"	—	25	000000000	00000
1/8" to 3/16"	3/64"			1/8"	9/16"	—	25	000000000	00000
3/16" to 1/4"	3/64"			1/4"	1"	—	25	000000000	00000
1/4" to 3/8"	3/64"			1/4"	1 9/16"	—	25	000000000	00000
1/4" to 3/8"	5/64"			1/4"	1 3/16"	—	25	000000000	00000
1/4" to 1/2"	1/16"			1/4"	1 5/16"	—	25	000000000	00000
1/4" to 1/2"	3/32"			3/8"	1 5/8"	—	25	000000000	00000
3/8" to 1/2"	1/16"			3/8"	1 9/16"	—	5	000000000	00000
3/8" to 1/2"	5/64"			3/8"	1 9/16"	—	25	000000000	00000


3/8" to 5/8"	3/32"			5/8"	2 5/16"	—	25	000000000	00000
7/16" to 3/4"	1/8"			1/2"	2 9/16"	—	10	000000000	00000
1/2" to 3/4"	3/32"			1/2"	2 1/2"	—	10	000000000	00000
1/2" to 3/4"	1/8"			3/8"	1 15/16"	—	10	000000000	00000
5/8" to 7/8"	1/8"			5/8"	2 1/2"	—	10	000000000	00000
5/8" to 7/8"	3/16"			5/8"	2 1/2"	—	1	000000000	0000
5/8" to 1"	11/64"			7/8"	3 1/4"	—	5	000000000	00000
3/4" to 1 1/16"	11/64"			7/8"	3 1/2"	—	1	000000000	0000
3/4" to 1 1/8"	9/64"			3/4"	3 5/16"	—	5	000000000	00000
7/8" to 1"	11/64"			1"	3 3/4"	—	5	000000000	00000


7/8" to 1 1/16"	5/32"			7/8"	2 3/16"	—	1	000000000	0000
1 1/8" to 1 1/2"	1/4"			7/8"	4"	—	1	000000000	00000
1 1/4" to 1 1/2"	1/4"			1 1/2"	5 1/8"	—	1	000000000	00000
9 mm to 14 mm	2 mm			10 mm	48 mm	DIN 11024	1	000000000	0000
9 mm to 15 mm	2.5 mm			10 mm	53 mm	DIN 11024	1	000000000	0000
10 mm to 16 mm	3 mm			18 mm	70 mm	DIN 11024	1	000000000	00000
16 mm to 20 mm	4 mm			20 mm	76 mm	DIN 11024	1	000000000	00000
20 mm to 28 mm	5 mm			24 mm	100 mm	DIN 11024	1	000000000	00000
28 mm to 40 mm	6 mm			30 mm	125 mm	DIN 11024	1	000000000	00000

Long-Life Hairpin Cotter Pins

You can use these pins over and over without reducing their hold, and they're quicker to install than standard cotter pins. One prong is already bent, so just push into a hole to secure parts in one step. Although the coil maintains tension, hairpins don’t withstand vibration as well as standard and hammer-set cotter pins. Also known as hitch pin clips and R-clips.

Steel

Spring Steel—Stronger than stainless steel, these pins won't deform from stress and vibration. They perform best in dry environments since moisture will cause them to rust.

	Wire Dia.	Eye Dia.	Lg.	Pkg. Qty.		Pkg.
Zinc-Plated Spring Steel



	5/16" to 1/2"	5/64"	3/8"	2 1/4"	25	000000000	000000


	1/2" to 3/4"	1/8"	5/8"	2 7/8"	10	000000000	00000
	1/2" to 7/8"	9/64"	3/4"	3 1/8"	10	000000000	00000
	5/8" to 1"	5/32"	7/8"	3 3/4"	10	000000000	00000
	5/8" to 1"	3/16"	1 1/8"	4 1/8"	10	000000000	00000
	1" to 1 9/16"	19/64"	1 3/8"	6 3/4"	1	000000000	0000
	8 mm to 14 mm	2 mm	11 mm	56 mm	1	000000000	0000
	14 mm to 20 mm	3 mm	17 mm	73 mm	1	000000000	0000
	17 mm to 24 mm	4 mm	26 mm	94 mm	1	000000000	0000
	18 mm to 30 mm	5 mm	27 mm	110 mm	1	000000000	0000
	24 mm to 36 mm	6 mm	32 mm	142 mm	1	000000000	0000


	26 mm to 40 mm	7 mm	31 mm	152 mm	1	000000000	0000


	Spring Steel



			5/16" to 1/2"	5/64"	3/8"	2 1/4"	25	000000000	00000


			1/2" to 3/4"	1/8"	5/8"	2 7/8"	10	000000000	0000
			1/2" to 7/8"	5/32"	3/4"	3 1/8"	10	000000000	00000
			5/8" to 1"	5/32"	7/8"	3 3/4"	10	000000000	00000
			5/8" to 1"	3/16"	1 1/8"	4 1/8"	10	000000000	00000
			1" to 1 9/16"	19/64"	1 3/8"	6 3/4"	1	000000000	0000

Corrosion-Resistant Stainless Steel

	Wire Dia.	Eye Dia.	Lg.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	5/16" to 1/2"	5/64"	3/8"	2 1/4"	5	000000000	000000


	1/2" to 3/4"	1/8"	5/8"	2 7/8"	5	000000000	00000
	1/2" to 7/8"	9/64"	3/4"	3 1/8"	5	000000000	00000
	5/8" to 1"	5/32"	7/8"	3 3/4"	1	000000000	0000
	5/8" to 1"	3/16"	1 1/8"	4 1/8"	1	000000000	0000
	1" to 1 9/16"	19/64"	1 3/8"	6 3/4"	1	000000000	00000
	8 mm to 14 mm	2 mm	11 mm	56 mm	1	000000000	0000
	14 mm to 20 mm	3 mm	17 mm	73 mm	1	000000000	0000
	17 mm to 24 mm	4 mm	26 mm	94 mm	1	000000000	0000
	24 mm to 36 mm	6 mm	32 mm	142 mm	1	000000000	00000


	Highly-Corrosion-Resistant 316 Stainless Steel



			5/16" to 1/2"	5/64"	3/8"	2 1/4"	5	000000000	00000


			1/2" to 3/4"	1/8"	5/8"	2 7/8"	1	000000000	0000
			1/2" to 7/8"	5/32"	3/4"	3 1/8"	1	000000000	0000
			5/8" to 1"	5/32"	7/8"	3 3/4"	1	000000000	0000
			5/8" to 1"	3/16"	1 1/8"	4 1/8"	1	000000000	0000
			1" to 1 9/16"	19/64"	1 3/8"	6 3/4"	1	000000000	00000

Single-End Studs with Cotter Pin

Also known as hood pins, these studs have a cotter pin lodged through a drilled hole in the unthreaded portion for light duty holding, such as securing access panels and locking other fasteners.

18-8 Stainless Steel—Stud and cotter pin are 18-8 stainless steel, making them chemical resistant and mildly magnetic.

			Shaft			Cotter Pin
	Lg.	Thread Lg.	Lg.	Dia.	Dia. Tolerance	Lg.	Hole Dia.	Tensile Strength	Hardness		Each
18-8 Stainless Steel







				5/16"-24

				2"	1"	1"	5/16"	-0.005" to 0.005"	2"	0.141"	Not Rated	Rockwell B89	000000000	00000


				3"	2"	1"	5/16"	-0.005" to 0.005"	3"	0.141"	Not Rated	Rockwell B89	000000000	0000
				4"	3"	1"	5/16"	-0.005" to 0.005"	4"	0.141"	Not Rated	Rockwell B89	000000000	0000




						3/8"-24

						2"	1"	1"	3/8"	-0.005" to 0.005"	2"	0.141"	Not Rated	Rockwell B89	000000000	0000


						3"	2"	1"	3/8"	-0.005" to 0.005"	3"	0.141"	Not Rated	Rockwell B89	000000000	0000
						4"	3"	1"	3/8"	-0.005" to 0.005"	4"	0.141"	Not Rated	Rockwell B89	000000000	00000




								1/2"-20

								2"	1"	1"	1/2"	-0.005" to 0.005"	2"	0.141"	Not Rated	Rockwell B89	000000000	0000


								3"	2"	1"	1/2"	-0.005" to 0.005"	3"	0.141"	Not Rated	Rockwell B89	000000000	0000
								4"	3"	1"	1/2"	-0.005" to 0.005"	4"	0.141"	Not Rated	Rockwell B89	000000000	00000

Hairpin Cotter Pin Assortments

These pins come in a range of sizes to fit various clevis pin diameters, and you can install them in a single step. One prong is already bent, so just push them into a hole and pins stay in place to secure components. Although hairpins are reusable, they don’t withstand vibration as well as standard cotter pins. Also known as hitch pin clips and R-clips.

	No. of Pieces	Container Type		Each
Zinc-Plated Spring Steel



	For 1/8" to 1 1/2" Clevis Pin Dia.	74	Plastic Box	000000000	000000


	For 1/8" to 7/16" Clevis Pin Dia.	50	Plastic Box	000000000	00000
	For 3/16" to 1" Clevis Pin Dia.	130	Plastic Box	000000000	00000


	18-8 Stainless Steel



			For 1/8" to 7/16" Clevis Pin Dia.	50	Plastic Box	000000000	00000