Metric Cotter Pins | McMaster-Carr

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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							0000
		56	DIN 94, ISO 1234	25	000000000							0000
		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	0000
						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	0000
								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.

	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	0000
			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	83	—	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

Super-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

	Super-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