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	2	Closed and Ground	DIN 2095	5	2006N356	000000


	45	18	14	2	17.7	37	1.4	Closed and Ground	DIN 2095	5	2006N357	00000


	Highly Corrosion-Resistant 316 Stainless Steel



			45	5.99	4.37	0.81	30.9	4.1	0.29	Closed and Ground	—	1	8969T632	0000


			45	7.49	5.61	0.97	29.6	5.5	0.35	Closed and Ground	—	1	8969T704	0000
			45	7.49	5.87	0.81	27.5	3.3	0.19	Closed and Ground	—	1	8969T658	0000
			45	7.49	6.17	0.66	25.7	1.8	0.09	Closed and Ground	—	1	8969T564	0000
			45	7.49	6.37	0.56	23.3	1.1	0.05	Closed and Ground	—	1	8969T455	0000
			45	8.99	7.11	0.97	29.3	4.6	0.26	Closed and Ground	—	1	8969T722	0000
			45	9.6	6.4	1.6	35.9	18	2	Closed and Ground	—	1	8969T928	0000
			45	10.8	8.2	1.3	29	9	0.56	Closed and Ground	—	1	8969T89	0000
			45	11.99	9.19	1.4	28	10	0.59	Closed and Ground	—	1	8969T903	0000
			45	11.99	10.11	0.97	23.7	3.5	0.16	Closed and Ground	—	1	8969T738	0000
			45	13.51	11.33	1.09	20.7	4.5	0.18	Closed and Ground	—	1	8969T824	0000


			45	15.01	11.81	1.6	26.7	12	0.65	Closed and Ground	—	1	8969T947	0000
			45	15.01	12.63	1.19	17.2	5.2	0.18	Closed and Ground	—	1	8969T842	0000
			45	18	14	2.03	31.6	19	1.4	Closed and Ground	—	1	8969T973	0000
			45	18.29	14.27	2.03	28.8	19	1.1	Closed and Ground	—	1	8969T985	0000
			45	18.29	15.49	1.4	22.8	6.8	0.3	Closed and Ground	—	1	8969T917	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.

	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	91612A248	000000

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







		4 mm Diameter

		45	4	0.5	1,700 lbf	Rockwell C42	DIN 7346, ISO 13337	25	97161A159	00000


		45	4 to 4.2	0.8	2,500 lbf	Rockwell C42	ISO 8752	100	91611A218	00000




				5 mm Diameter

				45	5	0.5	2,300 lbf	Rockwell C42	DIN 7346, ISO 13337	25	97161A177	0000


				45	5 to 5.2	1	3,900 lbf	Rockwell C42	ISO 8752	100	91611A317	00000




						6 mm Diameter

						45	6	0.75	4,000 lbf	Rockwell C42	DIN 7346, ISO 13337	10	97161A196	0000


						45	6 to 6.2	1.2	5,800 lbf	Rockwell C42	ISO 8752	50	91611A414	00000




								8 mm Diameter

								45	8	0.75	5,300 lbf	Rockwell C42	DIN 7346, ISO 13337	10	97161A217	0000




										10 mm Diameter

										45	10	1	5,300 lbf	Rockwell C42	DIN 7346, ISO 13337	10	97161A236	00000




												12 mm Diameter

												45	12	1	10,700 lbf	Rockwell C42	DIN 7346, ISO 13337	5	97161A253	0000




														16 mm Diameter

														45	16	1.5	22,000 lbf	Rockwell C42	DIN 7346, ISO 13337	1	97161A289	00000




	21 mm Diameter

	45														21	2	37,700 lbf	Rockwell C42	DIN 7346, ISO 13337	1	97161A298	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	91610A515	0000




																5 mm Diameter

																45	5 to 5.2	1	Not Rated	Not Rated	ISO 8752	10	91610A615	0000




					6 mm Diameter

					45												6 to 6.2	1.2	Not Rated	Not Rated	DIN 1481, ISO 8752	10	91610A722	0000