5mm 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.

Ultra-Corrosion-Resistant Cobalt Nickel—The best choice when you need both corrosion resistance and strength. These springs resist stress corrosion and pitting from salt water and harsh chemicals. Plus, they’re 10% stronger than 316 stainless steel.

	OD, mm	ID, mm	Wire Dia., mm	Compressed Lg. @ Max. Load, mm	Max. Load, lb.	Spring Rate, lbf/mm	End Type	Pkg. Qty.		Pkg.
Corrosion-Resistant 302 Stainless Steel



	5	2.39	1.58	0.41	3.734	1.43	1.13	Closed	5	00000000	000000


	5	2.49	1.88	0.3	2.9	0.68	0.33	Closed	5	00000000	00000


	Highly-Corrosion-Resistant 316 Stainless Steel



			5	1.4	0.9	0.25	4	0.5	0.55	Closed	1	00000000	0000


			5	1.4	1	0.2	3.5	0.2	0.19	Closed	1	0000000	0000
			5	2	1.4	0.3	3.7	0.6	0.52	Closed	1	00000000	0000
			5	2	1.5	0.25	3.3	0.3	0.23	Closed	1	00000000	0000
			5	2	1.6	0.2	2.9	0.2	0.09	Closed	1	00000000	0000
			5	2.5	1.9	0.3	3.3	0.5	0.33	Closed	1	00000000	0000
			5	2.5	2	0.25	3	0.3	0.15	Closed	1	00000000	0000


			Ultra-Corrosion-Resistant Cobalt Nickel



					5	1.32	1.04	0.14	2.4	0.16	0.06	Closed	5	00000000	00000


					5	1.32	1.1	0.11	2	0.08	0.03	Closed	5	00000000	00000
					5	1.65	1.37	0.14	2	0.12	0.04	Closed	5	00000000	00000
					5	1.65	1.43	0.11	1.7	0.07	0.02	Closed	5	00000000	00000

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.

	Double Shear Breaking Strength, lbf	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
Spring Steel







	1.5 mm Diameter

	5	1.5 to 1.6	0.3	350	Rockwell C42	DIN 1481, ISO 8752	100	000000000	00000




			2 mm Diameter

			5	2	0.2	330	Rockwell C42	DIN 7346, ISO 13337	50	000000000	00000


			5	2 to 2.1	0.4	600	Rockwell C42	ISO 8752	200	000000000	00000




					2.5 mm Diameter

					5	2.5	0.25	530	Rockwell C42	DIN 7346, ISO 13337	50	000000000	0000




							3 mm Diameter

							5	3	0.3	780	Rockwell C42	DIN 7346, ISO 13337	50	000000000	0000




									5 mm Diameter

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


									Corrosion-Resistant 18-8 Stainless Steel







													1.5 mm Diameter

													5	1.5 to 1.6	0.3	Not Rated	Not Rated	ISO 8752	100	000000000	0000




															2 mm Diameter

															5	2 to 2.1	0.4	Not Rated	Not Rated	ISO 8752	100	000000000	0000