17.5mm 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.

	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



	17.5	3	2	0.5	12.8	1.9	0.41	Closed	DIN 2095	5	00000000	000000


	17.5	3.61	2.8	0.41	8.5	1	0.12	Closed	—	5	00000000	00000
	17.5	5.8	4.2	0.8	10.9	4.8	0.74	Closed	DIN 2095	5	00000000	00000
	17.5	11	9	1	8	5.1	0.54	Closed and Ground	DIN 2095	5	00000000	00000


	Highly Corrosion-Resistant 316 Stainless Steel



			17.5	1.4	1	0.2	11.9	0.2	0.05	Closed	—	1	00000000	0000


			17.5	2	1.6	0.2	9.4	0.2	0.02	Closed	—	1	00000000	0000
			17.5	3	2	0.5	12.6	2	0.41	Closed and Ground	—	1	00000000	0000
			17.5	3.6	2.8	0.4	10	0.9	0.12	Closed	—	1	00000000	0000
			17.5	5.8	4.2	0.8	11.8	4.2	0.74	Closed and Ground	—	1	00000000	0000
			17.5	11	9	1	10	4.1	0.55	Closed and Ground	—	1	0000000	0000

Extension Springs

Hook End

The farther you stretch these springs, the harder they pull to bring the two ends back together. They're commonly used to tension cable, return an air cylinder to its starting point, or hold a door closed.

Hook End—Hook into closed holes, such as hanger bolt eyes. These springs work best when kept under tension, as they're more likely to slip off than loop-end springs when tension is released. Also known as machine hook ends.

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 extend than steel, but can’t handle as high a load.

Minimum Load—The amount of force required to start extending the spring.

Maximum Load—The amount of force required to fully extend the spring.

					Load, lb.
	Lg., mm	OD, mm	Wire Dia., mm	Extended Lg. @ Max. Load, mm	Min.	Max.	Spring Rate, lbf/mm	Pkg. Qty.		Pkg.
Hook End







				Highly Corrosion-Resistant 316 Stainless Steel

				17.5	2	0.25	38.5	0.06	0.76	0.03	5	0000000	000000


				17.5	3	0.3	46.3	0.08	0.84	0.03	5	000000	00000
				17.5	4	0.3	62.4	0.06	0.61	0.01	5	0000000	00000