30mm Springs | McMaster-Carr

Squeeze these springs and they’ll push right back to their original length. When compressed, they apply steady pressure to keep components securely in place. Release the pressure and they snap back instantly, just like the tip of a ballpoint pen.

Spring Steel—Strong and resilient, but best suited for dry environments since moisture will cause these springs to rust.

Corrosion-Resistant 302 Stainless Steel—Won’t corrode from exposure to moisture and mild chemicals, including ammonia often found in cleaning solutions. These springs are easier to compress than steel, but can’t handle as high a load.

Highly-Corrosion-Resistant 316 Stainless Steel—Our most corrosion-resistant stainless steel springs won't degrade when exposed to salt water and harsh chemicals. They're easier to compress than steel, but can’t handle as high a load.

	OD, mm	ID, mm	Wire Dia., mm	Compressed Lg. @ Max. Load, mm	Max. Load, lb.	Spring Rate, lbf/mm	End Type	Specs. Met	Pkg. Qty.		Pkg.
Spring Steel



	30	5.5	4.5	0.5	12.63	1.48	0.09	Closed	DIN 2095, DIN 2098, DIN 17223	5	000000000	000000


	Corrosion-Resistant 302 Stainless Steel



			30	5.5	4.5	0.5	10.6	1.51	0.08	Closed	DIN 2095	5	00000000	00000


			30	6.8	5.8	0.5	8.7	1.23	0.06	Closed	DIN 2095	5	00000000	00000
			30	10.8	9.2	0.8	9.8	2.88	0.14	Closed	DIN 2095	5	00000000	00000
			30	18	14	2	12.5	37.1	2.13	Closed and Ground	DIN 2095	5	00000000	00000


			Highly-Corrosion-Resistant 316 Stainless Steel



					30	3	1.98	0.51	22.377	2	0.26	Closed and Ground	—	1	00000000	0000


					30	3	2.28	0.36	19.7	0.7	0.07	Closed and Ground	—	1	0000000	0000
					30	3	2.4	0.3	15.9	0.4	0.03	Closed	—	1	00000000	0000
					30	3	2.5	0.25	14.1	0.2	0.01	Closed	—	1	00000000	0000
					30	3.71	2.49	0.61	21.234	2.8	0.32	Closed and Ground	—	1	00000000	0000
					30	4.6	3.38	0.61	20.091	2.3	0.23	Closed and Ground	—	1	00000000	0000
					30	4.6	3.88	0.36	16.5	0.4	0.03	Closed and Ground	—	1	00000000	0000
					30	5.5	4.5	0.5	15.1	1.1	0.07	Closed and Ground	—	1	00000000	0000
					30	5.99	3.81	1.09	24.003	9.5	1.58	Closed and Ground	—	1	00000000	0000
					30	5.99	4.37	0.81	20.777	4.1	0.44	Closed and Ground	—	1	00000000	0000
					30	5.99	4.77	0.61	15.9	1.8	0.12	Closed and Ground	—	1	00000000	0000


					30	5.99	4.97	0.51	14.6	1	0.06	Closed and Ground	—	1	00000000	0000
					30	6.8	5.8	0.5	13.4	0.9	0.05	Closed and Ground	—	1	00000000	0000
					30	7.49	5.61	0.97	19.939	5.5	0.54	Closed and Ground	—	1	00000000	0000
					30	7.49	5.87	0.81	18.517	3.3	0.29	Closed and Ground	—	1	00000000	0000
					30	7.49	6.17	0.66	17.297	1.8	0.14	Closed and Ground	—	1	0000000	0000
					30	7.49	6.37	0.56	15.7	1.1	0.08	Closed and Ground	—	1	0000000	0000
					30	8.99	6.81	1.09	20.599	6.6	0.7	Closed and Ground	—	1	00000000	0000
					30	8.99	7.11	0.97	18.39	4.6	0.4	Closed and Ground	—	1	00000000	0000
					30	8.99	7.67	0.66	16.154	1.5	0.11	Closed and Ground	—	1	00000000	0000
					30	10.8	8.2	1.3	19.634	9	0.87	Closed and Ground	—	1	00000000	0000


					30	10.8	9.02	0.89	16.205	3	0.22	Closed and Ground	—	1	00000000	0000
					30	10.8	9.2	0.8	13.462	2.3	0.14	Closed and Ground	—	1	00000000	0000
					30	11.99	10.11	0.97	16.104	3.5	0.25	Closed and Ground	—	1	00000000	0000
					30	13.51	11.33	1.09	14.097	4.5	0.28	Closed and Ground	—	1	00000000	0000
					30	15.01	11.81	1.6	18.263	12	1.02	Closed and Ground	—	1	00000000	0000
					30	15.01	12.63	1.19	11.963	5.2	0.29	Closed and Ground	—	1	00000000	0000
					30	18	14	2.03	21.463	19.7	2.16	Closed and Ground	—	1	00000000	0000
					30	18.29	15.49	1.4	15.697	6.8	0.47	Closed and Ground	—	1	00000000	0000

Slotted Spring Pins

End View

Squeeze these pins into holes and they expand slightly, creating tension to hold parts in place. They are often used as hinge pins and as fasteners for springs and power transmission components. An alternative to dowel pins, they're lighter in weight with a hollow center and don’t need a precise hole. Also known as roll pins.

Spring Steel—These pins won't deform from stress and vibration. Although they're stronger than stainless steel, they're best for dry environments since moisture will cause them to rust.

Corrosion-Resistant 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	For Hole Dia., mm	Wall Thk., mm	Double Shear Breaking Strength, lbf	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
Spring Steel







				2 mm Diameter

				30	2	0.2	330	Rockwell C42	DIN 7346, ISO 13337	100	000000000	000000


				30	2 to 2.1	0.4	600	Rockwell C42	ISO 8752	100	000000000	00000




						2.5 mm Diameter

						30	2.5	0.25	530	Rockwell C42	DIN 7346, ISO 13337	50	000000000	00000


						30	2.5 to 2.6	0.5	950	Rockwell C42	ISO 8752	100	000000000	00000




								3 mm Diameter

								30	3	0.3	780	Rockwell C42	DIN 7346, ISO 13337	50	000000000	00000


								30	3 to 3.1	0.6	1,400	Rockwell C42	ISO 8752	100	000000000	00000




										3.5 mm Diameter

										30	3.5 to 3.65	0.8	2,000	Rockwell C42	ISO 8752	100	000000000	00000




												4 mm Diameter

												30	4	0.5	1,700	Rockwell C42	DIN 7346, ISO 13337	50	000000000	00000


												30	4 to 4.2	0.8	2,500	Rockwell C42	ISO 8752	100	000000000	00000




														5 mm Diameter

														30	5	0.5	2,300	Rockwell C42	DIN 7346, ISO 13337	50	000000000	00000


														30	5 to 5.2	1	3,900	Rockwell C42	ISO 8752	100	000000000	00000




6 mm Diameter

30	6															0.75	4,000	Rockwell C42	DIN 7346, ISO 13337	25	000000000	00000


30	6 to 6.2															1.2	5,800	Rockwell C42	ISO 8752	50	000000000	00000




		8 mm Diameter

		30	8													0.75	5,300	Rockwell C42	DIN 7346, ISO 13337	10	000000000	0000


		30	8 to 8.25													1.5	9,600	Rockwell C42	ISO 8752	50	000000000	00000




				10 mm Diameter

				30	10											1	5,300	Rockwell C42	DIN 7346, ISO 13337	10	000000000	0000


				30	10 to 10.3											2	15,700	Rockwell C42	ISO 8752	25	000000000	00000




						12 mm Diameter

						30	12									1	10,700	Rockwell C42	DIN 7346, ISO 13337	5	000000000	0000


						30	12 to 12.3									2.5	23,000	Rockwell C42	ISO 8752	5	000000000	00000




								13 mm Diameter

								30	13							1.2	14,800	Rockwell C42	DIN 7346, ISO 13337	5	000000000	0000




										16 mm Diameter

										30	16					1.5	22,000	Rockwell C42	DIN 7346, ISO 13337	1	000000000	0000




																21 mm Diameter

																30	21	2	37,700	Rockwell C42	DIN 7346, ISO 13337	1	000000000	0000


												Corrosion-Resistant 18-8 Stainless Steel







																		2 mm Diameter

														30				2 to 2.1	0.4	Not Rated	Not Rated	DIN 1481, ISO 8752	25	000000000	0000




														2.5 mm Diameter

														30	2.5 to 2.6			0.5	Not Rated	Not Rated	DIN 1481, ISO 8752	25	000000000	0000




																		3 mm Diameter

		30	3 to 3.1															0.6	Not Rated	Not Rated	DIN 1481, ISO 8752	10	000000000	0000




																		3.5 mm Diameter

																		30	3.5 to 3.6	0.7	Not Rated	Not Rated	ISO 8752	50	000000000	0000




																		4 mm Diameter

																		30	4 to 4.2	0.8	Not Rated	Not Rated	DIN 1481, ISO 8752	10	000000000	0000




						5 mm Diameter

						30	5 to 5.2													1	Not Rated	Not Rated	DIN 1481, ISO 8752	10	000000000	0000




																				6 mm Diameter

								30	6 to 6.2											1.2	Not Rated	Not Rated	DIN 1481, ISO 8752	10	000000000	0000




																				8 mm Diameter

										30	8 to 8.25									1.5	Not Rated	Not Rated	DIN 1481, ISO 8752	10	000000000	0000




																				10 mm Diameter

												30								10 to 10.3	2	Not Rated	Not Rated	DIN 1481, ISO 8752	1	000000000	0000

Coiled Spring Pins


	End View

The best spring pins for joining parts exposed to vibration and shock. They're often used in power transmission, automation, and other assemblies with constant motion and sudden starts and stops. Because of their spiral shape, they flex to conform to holes that aren’t perfectly round.

Spring Steel—These pins won't deform from stress and vibration. Although they're stronger than stainless steel, they're best for dry environments since moisture will cause them to rust.

	For Hole Dia., mm	Double Shear Breaking Strength, lbf	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
Spring Steel







			3 mm Diameter

			30	3.000 to 3.100	1,200	Rockwell C43	DIN 7343, ISO 8750	25	000000000	00000




					3.5 mm Diameter

					30	3.500 to 3.600	1,600	Rockwell C43	ASME B18.8.3M, DIN 7343, ISO 8750	25	000000000	00000




							4 mm Diameter

							30	4.000 to 4.100	2,100	Rockwell C43	DIN 7343, ISO 8750	25	000000000	0000




									5 mm Diameter

									30	5.000 to 5.100	3,300	Rockwell C43	DIN 7343, ISO 8750	25	000000000	00000




											6 mm Diameter

											30	6.000 to 6.100	4,900	Rockwell C43	DIN 7343, ISO 8750	10	000000000	0000




													8 mm Diameter

													30	8.000 to 8.200	8,700	Rockwell C43	DIN 7343, ISO 8750	5	000000000	0000


													Corrosion-Resistant 18-8 Stainless Steel







																	3 mm Diameter

																	30	3.000 to 3.100	900	Not Rated	DIN 7343, ISO 8750	10	000000000	00000




																			4 mm Diameter

30																			4.000 to 4.100	1,700	Not Rated	ASME B18.8.3M, DIN 7343, ISO 8750	10	000000000	00000




	5 mm Diameter

	30	5.000 to 5.100																	2,500	Not Rated	DIN 7343, ISO 8750	5	000000000	00000




																			6 mm Diameter

			30	6.000 to 6.100															3,700	Not Rated	DIN 7343, ISO 8750	5	000000000	00000