45mm 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.

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.
Corrosion-Resistant 302 Stainless Steel



	45	9.6	6.4	1.6	24.8	39.67	1.95	Closed and Ground	DIN 2095	5	00000000	000000


	45	18	14	2	17.7	37.1	1.36	Closed and Ground	DIN 2095	5	00000000	00000


	Highly-Corrosion-Resistant 316 Stainless Steel



			45	5.99	4.37	0.81	30.912	4.1	0.29	Closed and Ground	—	1	00000000	0000


			45	7.49	5.61	0.97	29.591	5.5	0.35	Closed and Ground	—	1	00000000	0000
			45	7.49	5.87	0.81	27.483	3.3	0.19	Closed and Ground	—	1	00000000	0000
			45	7.49	6.17	0.66	25.654	1.8	0.09	Closed and Ground	—	1	00000000	0000
			45	7.49	6.37	0.56	23.3	1.1	0.05	Closed and Ground	—	1	00000000	0000
			45	8.99	7.11	0.97	29.286	4.6	0.26	Closed and Ground	—	1	00000000	0000
			45	9.6	6.4	1.6	35.865	18.1	1.98	Closed and Ground	—	1	00000000	0000
			45	10.8	8.2	1.3	29.032	9	0.56	Closed and Ground	—	1	0000000	0000
			45	11.99	9.19	1.4	28.016	10.1	0.59	Closed and Ground	—	1	00000000	0000
			45	11.99	10.11	0.97	23.698	3.5	0.16	Closed and Ground	—	1	00000000	0000
			45	13.51	11.33	1.09	20.65	4.5	0.18	Closed and Ground	—	1	00000000	0000


			45	15.01	11.81	1.6	26.67	12	0.65	Closed and Ground	—	1	00000000	0000
			45	15.01	12.63	1.19	17.196	5.2	0.18	Closed and Ground	—	1	00000000	0000
			45	18	14	2.03	31.598	19.7	1.37	Closed and Ground	—	1	00000000	0000
			45	18.29	14.27	2.03	28.804	19.4	1.13	Closed and Ground	—	1	00000000	0000
			45	18.29	15.49	1.4	22.835	6.8	0.3	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	Double Shear Breaking Strength, lbf	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
Spring Steel







		4 mm Diameter

		45	4	0.5	1,700	Rockwell C42	DIN 7346, ISO 13337	25	000000000	00000


		45	4 to 4.2	0.8	2,500	Rockwell C42	ISO 8752	100	000000000	00000




				5 mm Diameter

				45	5	0.5	2,300	Rockwell C42	DIN 7346, ISO 13337	25	000000000	0000


				45	5 to 5.2	1	3,900	Rockwell C42	ISO 8752	100	000000000	00000




						6 mm Diameter

						45	6	0.75	4,000	Rockwell C42	DIN 7346, ISO 13337	10	000000000	0000


						45	6 to 6.2	1.2	5,800	Rockwell C42	ISO 8752	50	000000000	00000




								8 mm Diameter

								45	8	0.75	5,300	Rockwell C42	DIN 7346, ISO 13337	10	000000000	0000




										10 mm Diameter

										45	10	1	5,300	Rockwell C42	DIN 7346, ISO 13337	10	000000000	00000




												12 mm Diameter

												45	12	1	10,700	Rockwell C42	DIN 7346, ISO 13337	5	000000000	00000




														16 mm Diameter

														45	16	1.5	22,000	Rockwell C42	DIN 7346, ISO 13337	1	000000000	0000




	21 mm Diameter

	45														21	2	37,700	Rockwell C42	DIN 7346, ISO 13337	1	000000000	00000


	Corrosion-Resistant 18-8 Stainless Steel







																4 mm Diameter

																45	4 to 4.2	0.8	Not Rated	Not Rated	DIN 1481, ISO 8752	10	000000000	0000




																5 mm Diameter

																45	5 to 5.2	1	Not Rated	Not Rated	ISO 8752	10	000000000	0000




					6 mm Diameter

					45												6 to 6.2	1.2	Not Rated	Not Rated	DIN 1481, ISO 8752	10	000000000	00000

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.

	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
Spring Steel







	8 mm Diameter

	45	8.000 to 8.200	8,700	Rockwell C43	ISO 8750	5	000000000	000000