Metric Cotter Pins | McMaster-Carr

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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	98350A130	00000


				10	DIN 94, ISO 1234	200	98350A135	0000
				12	DIN 94, ISO 1234	200	98350A601	00000
				16	DIN 94, ISO 1234	200	98350A602	00000
				20	DIN 94, ISO 1234	200	98350A140	0000
				25	DIN 94, ISO 1234	200	98350A603	00000




						1.6 mm Diameter

						8	DIN 94, ISO 1234	200	98350A605	00000


						10	DIN 94, ISO 1234	200	98350A606	00000
						12	DIN 94, ISO 1234	200	98350A607	00000
						16	DIN 94, ISO 1234	200	98350A608	00000
						20	DIN 94, ISO 1234	200	98350A609	00000
						25	DIN 94, ISO 1234	200	98350A611	00000
						32	DIN 94, ISO 1234	200	98350A612	00000
						36	DIN 94, ISO 1234	200	98350A613	00000
						40	DIN 94, ISO 1234	200	98350A614	00000




								2 mm Diameter

								10	DIN 94, ISO 1234	50	98350A615	0000


								12	DIN 94, ISO 1234	50	98350A150	0000
								16	DIN 94, ISO 1234	50	98350A616	0000
								18	DIN 94, ISO 1234	50	98350A617	0000
								20	DIN 94, ISO 1234	50	98350A160	0000
								22	DIN 94, ISO 1234	50	98350A618	0000
								25	DIN 94, ISO 1234	25	98350A170	0000
								32	DIN 94, ISO 1234	25	98350A180	0000
								36	DIN 94, ISO 1234	50	98350A619	0000
								40	DIN 94, ISO 1234	25	98350A190	0000
								45	DIN 94, ISO 1234	25	98350A195	0000


								50	DIN 94, ISO 1234	25	98350A200	0000




										2.5 mm Diameter

										16	DIN 94, ISO 1234	50	98350A621	0000


20	DIN 94, ISO 1234									50	98350A210	0000
25	DIN 94, ISO 1234									25	98350A215	0000
32	DIN 94, ISO 1234									25	98350A220	0000
36	DIN 94, ISO 1234									50	98350A622	0000
40	DIN 94, ISO 1234	25								98350A230	00000
45	DIN 94, ISO 1234	25	98350A240							0000
50	DIN 94, ISO 1234	25	98350A250							0000




		3.2 mm Diameter

		10	DIN 94, ISO 1234							50	98350A623	0000


		16	DIN 94, ISO 1234							50	98350A624	0000
		18	DIN 94, ISO 1234							50	98350A625	0000
		20	DIN 94, ISO 1234							50	98350A260	0000
		25	DIN 94, ISO 1234	25						98350A270	0000
		28	DIN 94, ISO 1234	25	98350A626					0000
		32	DIN 94, ISO 1234	25	98350A280					0000
		36	DIN 94, ISO 1234	25	98350A627					0000
		40	DIN 94, ISO 1234	25	98350A290					0000
		45	DIN 94, ISO 1234	25	98350A305					0000
		50	DIN 94, ISO 1234	25	98350A310					0000


		63	DIN 94, ISO 1234	25	98350A330					0000




				4 mm Diameter

				20	DIN 94, ISO 1234					50	98350A350	0000


				25	DIN 94, ISO 1234	25	98350A360			0000
				28	DIN 94, ISO 1234	25	98350A631			0000
				32	DIN 94, ISO 1234	25	98350A365			0000
				36	DIN 94, ISO 1234	25	98350A632			0000
				40	DIN 94, ISO 1234	25	98350A370			0000
				45	DIN 94, ISO 1234	25	98350A380			0000
				50	DIN 94, ISO 1234	25	98350A390			00000
				56	DIN 94, ISO 1234	25	98350A410			00000
				63	DIN 94, ISO 1234	25	98350A430			00000
				71	DIN 94, ISO 1234	25	98350A440			00000




						5 mm Diameter

						25	DIN 94, ISO 1234			25	98350A450	0000


						32	DIN 94, ISO 1234			25	98350A460	00000
						36	DIN 94, ISO 1234			25	98350A635	00000
						40	DIN 94, ISO 1234			25	98350A470	00000
						45	DIN 94, ISO 1234	25		98350A475	00000
						50	DIN 94, ISO 1234	25	98350A480	00000
						56	DIN 94, ISO 1234	25	98350A636	00000
						63	DIN 94, ISO 1234	25	98350A490	00000
						71	DIN 94, ISO 1234	25	98350A500	00000
						80	DIN 94, ISO 1234	25	98350A637	00000
						100	DIN 94, ISO 1234	25	98350A638	00000




								6.3 mm Diameter

40								DIN 94, ISO 1234	10	98350A540	0000


50	DIN 94, ISO 1234							10	98350A550	0000
56	DIN 94, ISO 1234							10	98350A643	0000
63	DIN 94, ISO 1234							10	98350A570	0000
71	DIN 94, ISO 1234							10	98350A580	00000
80	DIN 94, ISO 1234							10	98350A644	00000
90	DIN 94, ISO 1234							10	98350A600	00000
100	DIN 94, ISO 1234							10	98350A610	00000




								8 mm Diameter

								40	DIN 94, ISO 1234	10	98350A620	00000


								45	DIN 94, ISO 1234	10	98350A646	00000
								50	DIN 94, ISO 1234	10	98350A630	00000
								56	DIN 94, ISO 1234	10	98350A647	00000
		63						DIN 94, ISO 1234	10	98350A640	00000
		71	DIN 94, ISO 1234					10	98350A650	00000
		80	DIN 94, ISO 1234					10	98350A648	00000
		90	DIN 94, ISO 1234					10	98350A670	00000
		100	DIN 94, ISO 1234					10	98350A680	00000
		125	DIN 94, ISO 1234					5	98350A690	00000




								10 mm Diameter

								63	DIN 94, ISO 1234	10	98350A710	00000


								71	DIN 94, ISO 1234	5	98350A720	00000
								80	DIN 94, ISO 1234	5	98350A652	00000
								90	DIN 94, ISO 1234	5	98350A740	00000
								100	DIN 94, ISO 1234	5	98350A750	00000
				125				DIN 94, ISO 1234	1	98350A770	0000
				140	DIN 94, ISO 1234			1	98350A654	0000




								13 mm Diameter

								125	DIN 94, ISO 1234	1	98350A655	0000


								140	DIN 94, ISO 1234	1	98350A656	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	98350A208	000000


				10	DIN 94, ISO 1234	100	98350A211	0000
				12	DIN 94, ISO 1234	100	98350A212	0000
				14	DIN 94, ISO 1234	100	98350A811	00000
				16	DIN 94, ISO 1234	100	98350A216	00000
				20	DIN 94, ISO 1234	100	98350A813	00000
				22	DIN 94, ISO 1234	100	98350A814	00000
				25	DIN 94, ISO 1234	100	98350A815	00000
				28	DIN 94, ISO 1234	100	98350A816	00000




						2 mm Diameter

						10	DIN 94, ISO 1234	100	98350A311	00000


						12	DIN 94, ISO 1234	100	98350A312	00000
						14	DIN 94, ISO 1234	100	98350A817	00000
						16	DIN 94, ISO 1234	100	98350A316	00000
						20	DIN 94, ISO 1234	100	98350A320	00000
						22	DIN 94, ISO 1234	100	98350A818	00000
						25	DIN 94, ISO 1234	100	98350A325	00000
						28	DIN 94, ISO 1234	100	98350A819	00000
						32	DIN 94, ISO 1234	50	98350A332	00000
						40	DIN 94, ISO 1234	50	98350A821	00000




								2.5 mm Diameter

								12	DIN 94, ISO 1234	100	98350A824	00000


								16	DIN 94, ISO 1234	100	98350A658	00000
								18	DIN 94, ISO 1234	100	98350A825	00000
								20	DIN 94, ISO 1234	100	98350A826	00000
								22	DIN 94, ISO 1234	100	98350A827	00000
								25	DIN 94, ISO 1234	100	98350A659	00000
								50	DIN 94, ISO 1234	100	98350A831	00000




										3.2 mm Diameter

										16	DIN 94, ISO 1234	50	98350A832	00000


										18	DIN 94, ISO 1234	50	98350A662	00000
										20	DIN 94, ISO 1234	50	98350A351	00000
22										DIN 94, ISO 1234	50	98350A352	00000
25	DIN 94, ISO 1234									25	98350A355	00000
32	DIN 94, ISO 1234									25	98350A362	00000
40	DIN 94, ISO 1234									25	98350A834	00000
45	DIN 94, ISO 1234									25	98350A835	00000
50	DIN 94, ISO 1234	25								98350A836	00000




		4 mm Diameter

		20	DIN 94, ISO 1234							25	98350A842	00000


		25	DIN 94, ISO 1234							25	98350A425	00000
		28	DIN 94, ISO 1234							25	98350A663	00000
		32	DIN 94, ISO 1234							25	98350A432	00000
		40	DIN 94, ISO 1234							25	98350A845	00000
		80	DIN 94, ISO 1234							25	98350A852	00000




				5 mm Diameter

				32	DIN 94, ISO 1234					10	98350A502	00000


				36	DIN 94, ISO 1234					10	98350A855	00000
				40	DIN 94, ISO 1234					10	98350A510	00000
				45	DIN 94, ISO 1234					10	98350A856	00000
				50	DIN 94, ISO 1234					10	98350A515	00000
				80	DIN 94, ISO 1234					10	98350A859	00000




										6.3 mm Diameter

										32	DIN 94, ISO 1234	5	98350A862	00000


						40	DIN 94, ISO 1234			5	98350A575	00000
						45	DIN 94, ISO 1234			5	98350A863	00000
						50	DIN 94, ISO 1234			5	98350A590	00000
						56	DIN 94, ISO 1234			5	98350A864	00000
						63	DIN 94, ISO 1234			5	98350A865	00000
						90	DIN 94, ISO 1234			5	98350A868	00000




										8 mm Diameter

										63	DIN 94, ISO 1234	5	98350A875	00000


								90	DIN 94, ISO 1234	5	98350A878	00000
								100	DIN 94, ISO 1234	5	98350A667	00000




										10 mm Diameter

										71	DIN 94, ISO 1234	5	98350A669	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	98350A131	00000


	9 to 14	2	10	57	DIN 11024	10	98350A910	0000
	9 to 14	2.5	10	50	—	5	98350A132	0000
	10 to 16	3	18	72	DIN 11024	5	98350A920	0000
	10 to 16	3.5	18	70	—	5	98350A134	0000
	16 to 20	4	20	74	DIN 11024	5	98350A930	0000
	16 to 20	4	21	85	—	5	98350A133	0000
	16 to 26	4.5	21	82	—	10	98350A136	0000
	20 to 28	5	24	85	—	5	98350A137	00000
	20 to 28	5	24	102	DIN 11024	5	98350A940	00000
	28 to 40	6	24	105	—	5	98350A138	00000


	28 to 40	6	30	126	DIN 11024	1	98350A950	0000
	28 to 45	7	30	105	—	1	98350A139	0000
	28 to 45	7	30	127	DIN 11024	1	98350A960	0000
	30 to 45	8	28	110	—	1	98350A141	0000
	30 to 45	8	28	132	DIN 11024	1	98350A970	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	98350A111	00000


	10 to 16	3	18	72	DIN 11024	1	98350A112	0000
	16 to 20	4	20	74	DIN 11024	1	98350A113	0000
	20 to 28	5	24	102	DIN 11024	1	98350A114	0000
	28 to 40	6	30	126	DIN 11024	1	98350A115	00000


	Highly Corrosion-Resistant 316 Stainless Steel



			9 to 14	2	10	48	DIN 11024	1	98350A116	0000


			9 to 15	2.5	10	53	DIN 11024	1	98350A117	0000
			10 to 16	3	18	70	DIN 11024	1	98350A118	00000
			16 to 20	4	20	76	DIN 11024	1	98350A119	00000
			20 to 28	5	24	100	DIN 11024	1	98350A411	00000
			28 to 40	6	30	125	DIN 11024	1	98350A412	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	98335A201	00000


	14 to 20	3	17	73	1	98335A202	0000
	17 to 24	4	26	94	1	98335A203	0000
	18 to 30	5	27	110	1	98335A204	0000
	24 to 36	6	32	142	1	98335A205	0000
	26 to 40	7	31	152	1	98335A206	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	92391A201	00000


	14 to 20	3	17	73	1	92391A202	0000
	17 to 24	4	26	94	1	92391A203	0000
	24 to 36	6	32	142	1	92391A205	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	98350A300	000000