Metric Cotter Pins | McMaster-Carr

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Cotter Pin Type

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Material

Clevis Pin Diameter

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Specifications Met

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Performance

Export Control Classification Number (ECCN)

EAR99

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Compliant with Exemptions

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192 Products

Cotter Pin Type

Standard

Bend the prongs to secure the ends of clevis pins and shafts

155 products

Hairpin

Push into a hole for simple one-step installation

37 products

Performance

Corrosion Resistant

Resist rust in wet and outdoor environments

73 products

Reusable

Install and remove without bending for repeated use

37 products

Cotter Pins

Lock the ends of clevis pins and shafts to keep components in place. Slide these cotter pins into a hole and then bend the prongs outward with pliers to secure. Also known as split pins, one prong is slightly longer than the other for easy opening once inserted. Repeated bending will weaken the pin, so they should not be reused.

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.

	Lg., mm	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Spring Steel







				1 mm Diameter

				8	DIN 94, ISO 1234	200	000000000	00000


				10	DIN 94, ISO 1234	200	000000000	0000
				12	DIN 94, ISO 1234	200	000000000	00000
				16	DIN 94, ISO 1234	200	000000000	00000
				20	DIN 94, ISO 1234	200	000000000	0000
				25	DIN 94, ISO 1234	200	000000000	00000




						1.6 mm Diameter

						8	DIN 94, ISO 1234	200	000000000	00000


						10	DIN 94, ISO 1234	200	000000000	00000
						12	DIN 94, ISO 1234	200	000000000	00000
						16	DIN 94, ISO 1234	200	000000000	00000
						20	DIN 94, ISO 1234	200	000000000	00000
						25	DIN 94, ISO 1234	200	000000000	00000
						32	DIN 94, ISO 1234	200	000000000	00000
						36	DIN 94, ISO 1234	200	000000000	00000
						40	DIN 94, ISO 1234	200	000000000	00000




								2 mm Diameter

								10	DIN 94, ISO 1234	50	000000000	0000


								12	DIN 94, ISO 1234	50	000000000	0000
								16	DIN 94, ISO 1234	50	000000000	0000
								18	DIN 94, ISO 1234	50	000000000	0000
								20	DIN 94, ISO 1234	50	000000000	0000
								22	DIN 94, ISO 1234	50	000000000	0000
								25	DIN 94, ISO 1234	25	000000000	0000
								32	DIN 94, ISO 1234	25	000000000	0000
								36	DIN 94, ISO 1234	50	000000000	0000
								40	DIN 94, ISO 1234	25	000000000	0000
								45	DIN 94, ISO 1234	25	000000000	0000


								50	DIN 94, ISO 1234	25	000000000	0000




										2.5 mm Diameter

										16	DIN 94, ISO 1234	50	000000000	0000


20	DIN 94, ISO 1234									50	000000000	0000
25	DIN 94, ISO 1234									25	000000000	0000
32	DIN 94, ISO 1234									25	000000000	0000
36	DIN 94, ISO 1234									50	000000000	0000
40	DIN 94, ISO 1234	25								000000000	00000
45	DIN 94, ISO 1234	25	000000000							0000
50	DIN 94, ISO 1234	25	000000000							0000




		3.2 mm Diameter

		10	DIN 94, ISO 1234							50	000000000	0000


		16	DIN 94, ISO 1234							50	000000000	0000
		18	DIN 94, ISO 1234							50	000000000	0000
		20	DIN 94, ISO 1234							50	000000000	0000
		25	DIN 94, ISO 1234	25						000000000	0000
		28	DIN 94, ISO 1234	25	000000000					0000
		32	DIN 94, ISO 1234	25	000000000					0000
		36	DIN 94, ISO 1234	25	000000000					0000
		40	DIN 94, ISO 1234	25	000000000					0000
		45	DIN 94, ISO 1234	25	000000000					0000
		50	DIN 94, ISO 1234	25	000000000					0000


		63	DIN 94, ISO 1234	25	000000000					0000




				4 mm Diameter

				20	DIN 94, ISO 1234					50	000000000	0000


				25	DIN 94, ISO 1234	25	000000000			0000
				28	DIN 94, ISO 1234	25	000000000			0000
				32	DIN 94, ISO 1234	25	000000000			0000
				36	DIN 94, ISO 1234	25	000000000			0000
				40	DIN 94, ISO 1234	25	000000000			0000
				45	DIN 94, ISO 1234	25	000000000			0000
				50	DIN 94, ISO 1234	25	000000000			00000
				56	DIN 94, ISO 1234	25	000000000			00000
				63	DIN 94, ISO 1234	25	000000000			00000
				71	DIN 94, ISO 1234	25	000000000			00000




						5 mm Diameter

						25	DIN 94, ISO 1234			25	000000000	0000


						32	DIN 94, ISO 1234			25	000000000	00000
						36	DIN 94, ISO 1234			25	000000000	00000
						40	DIN 94, ISO 1234			25	000000000	00000
						45	DIN 94, ISO 1234	25		000000000	00000
						50	DIN 94, ISO 1234	25	000000000	00000
						56	DIN 94, ISO 1234	25	000000000	00000
						63	DIN 94, ISO 1234	25	000000000	00000
						71	DIN 94, ISO 1234	25	000000000	00000
						80	DIN 94, ISO 1234	25	000000000	00000
						100	DIN 94, ISO 1234	25	000000000	00000




								6.3 mm Diameter

40								DIN 94, ISO 1234	10	000000000	0000


50	DIN 94, ISO 1234							10	000000000	0000
56	DIN 94, ISO 1234							10	000000000	0000
63	DIN 94, ISO 1234							10	000000000	0000
71	DIN 94, ISO 1234							10	000000000	00000
80	DIN 94, ISO 1234							10	000000000	00000
90	DIN 94, ISO 1234							10	000000000	00000
100	DIN 94, ISO 1234							10	000000000	00000




								8 mm Diameter

								40	DIN 94, ISO 1234	10	000000000	00000


								45	DIN 94, ISO 1234	10	000000000	00000
								50	DIN 94, ISO 1234	10	000000000	00000
								56	DIN 94, ISO 1234	10	000000000	00000
		63						DIN 94, ISO 1234	10	000000000	00000
		71	DIN 94, ISO 1234					10	000000000	00000
		80	DIN 94, ISO 1234					10	000000000	00000
		90	DIN 94, ISO 1234					10	000000000	00000
		100	DIN 94, ISO 1234					10	000000000	00000
		125	DIN 94, ISO 1234					5	000000000	00000




								10 mm Diameter

								63	DIN 94, ISO 1234	10	000000000	00000


								71	DIN 94, ISO 1234	5	000000000	00000
								80	DIN 94, ISO 1234	5	000000000	00000
								90	DIN 94, ISO 1234	5	000000000	00000
								100	DIN 94, ISO 1234	5	000000000	00000
				125				DIN 94, ISO 1234	1	000000000	0000
				140	DIN 94, ISO 1234			1	000000000	0000




								13 mm Diameter

								125	DIN 94, ISO 1234	1	000000000	0000


								140	DIN 94, ISO 1234	1	000000000	0000

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.

	Lg., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1.6 mm Diameter

				8	DIN 94, ISO 1234	100	000000000	00000


				10	DIN 94, ISO 1234	100	000000000	0000
				12	DIN 94, ISO 1234	100	000000000	0000
				14	DIN 94, ISO 1234	100	000000000	00000
				16	DIN 94, ISO 1234	100	000000000	0000
				20	DIN 94, ISO 1234	100	000000000	00000
				22	DIN 94, ISO 1234	100	000000000	00000
				25	DIN 94, ISO 1234	100	000000000	00000
				28	DIN 94, ISO 1234	100	000000000	00000




						2 mm Diameter

						10	DIN 94, ISO 1234	100	000000000	0000


						12	DIN 94, ISO 1234	100	000000000	00000
						14	DIN 94, ISO 1234	100	000000000	00000
						16	DIN 94, ISO 1234	100	000000000	00000
						20	DIN 94, ISO 1234	100	000000000	00000
						22	DIN 94, ISO 1234	100	000000000	00000
						25	DIN 94, ISO 1234	100	000000000	00000
						28	DIN 94, ISO 1234	100	000000000	00000
						32	DIN 94, ISO 1234	50	000000000	00000
						40	DIN 94, ISO 1234	50	000000000	00000




								2.5 mm Diameter

								12	DIN 94, ISO 1234	100	000000000	00000


								16	DIN 94, ISO 1234	100	000000000	00000
								18	DIN 94, ISO 1234	100	000000000	00000
								20	DIN 94, ISO 1234	100	000000000	00000
								22	DIN 94, ISO 1234	100	000000000	00000
								25	DIN 94, ISO 1234	100	000000000	00000
								50	DIN 94, ISO 1234	100	000000000	00000




										3.2 mm Diameter

										16	DIN 94, ISO 1234	50	000000000	00000


										18	DIN 94, ISO 1234	50	000000000	00000
										20	DIN 94, ISO 1234	50	000000000	00000
22										DIN 94, ISO 1234	50	000000000	00000
25	DIN 94, ISO 1234									25	000000000	00000
32	DIN 94, ISO 1234									25	000000000	00000
40	DIN 94, ISO 1234									25	000000000	0000
45	DIN 94, ISO 1234									25	000000000	00000
50	DIN 94, ISO 1234	25								000000000	00000




		4 mm Diameter

		20	DIN 94, ISO 1234							25	000000000	00000


		25	DIN 94, ISO 1234							25	000000000	00000
		28	DIN 94, ISO 1234							25	000000000	00000
		32	DIN 94, ISO 1234							25	000000000	00000
		40	DIN 94, ISO 1234							25	000000000	00000
		80	DIN 94, ISO 1234							25	000000000	00000




				5 mm Diameter

				32	DIN 94, ISO 1234					10	000000000	00000


				36	DIN 94, ISO 1234					10	000000000	00000
				40	DIN 94, ISO 1234					10	000000000	00000
				45	DIN 94, ISO 1234					10	000000000	00000
				50	DIN 94, ISO 1234					10	000000000	00000
				80	DIN 94, ISO 1234					10	000000000	00000




										6.3 mm Diameter

										32	DIN 94, ISO 1234	5	000000000	00000


						40	DIN 94, ISO 1234			5	000000000	00000
						45	DIN 94, ISO 1234			5	000000000	00000
						50	DIN 94, ISO 1234			5	000000000	00000
						56	DIN 94, ISO 1234			5	000000000	00000
						63	DIN 94, ISO 1234			5	000000000	00000
						90	DIN 94, ISO 1234			5	000000000	00000




										8 mm Diameter

										63	DIN 94, ISO 1234	5	000000000	00000


								90	DIN 94, ISO 1234	5	000000000	00000
								100	DIN 94, ISO 1234	5	000000000	00000




										10 mm Diameter

										71	DIN 94, ISO 1234	5	000000000	00000

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

	Wire Dia., mm	Eye Dia., mm	Lg., mm	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Spring Steel



	6 to 11	2	10	50	—	5	000000000	00000


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


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

Corrosion-Resistant Stainless 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.

	Wire Dia., mm	Eye Dia., mm	Lg., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	9 to 14	2	10	57	DIN 11024	1	000000000	00000


	10 to 16	3	18	72	DIN 11024	1	000000000	0000
	16 to 20	4	20	74	DIN 11024	1	000000000	0000
	20 to 28	5	24	102	DIN 11024	1	000000000	00000
	28 to 40	6	30	126	DIN 11024	1	000000000	00000


	Highly-Corrosion-Resistant 316 Stainless Steel



			9 to 14	2	10	48	DIN 11024	1	000000000	0000


			9 to 15	2.5	10	53	DIN 11024	1	000000000	0000
			10 to 16	3	18	70	DIN 11024	1	000000000	00000
			16 to 20	4	20	76	DIN 11024	1	000000000	00000
			20 to 28	5	24	100	DIN 11024	1	000000000	00000
			28 to 40	6	30	125	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

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



	8 to 14	2	11	56	1	000000000	00000


	14 to 20	3	17	73	1	000000000	0000
	17 to 24	4	26	94	1	000000000	0000
	18 to 30	5	27	110	1	000000000	0000
	24 to 36	6	32	142	1	000000000	0000
	26 to 40	7	31	152	1	000000000	0000

Corrosion-Resistant Stainless Steel

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



	8 to 14	2	11	56	1	000000000	00000


	14 to 20	3	17	73	1	000000000	0000
	17 to 24	4	26	94	1	000000000	0000
	24 to 36	6	32	142	1	000000000	00000

Cotter Pin Assortments

Keep a range of sizes on hand to lock the ends of clevis pins and shafts and keep components in place. Slide these cotter pins into a hole and then bend the prongs outward with pliers to secure. Also known as split pins, one prong is slightly longer than the other for easy opening once inserted. Repeated bending will weaken the pin, so they should not be reused.

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.

	No. of Pieces	Container Type	Specs. Met		Each
Zinc-Plated Carbon Steel



	2.5 mm to 8 mm Dia. in 20 mm to 63 mm Lengths	100	Plastic Box	ASME B18.8.200M	000000000	000000