15mm 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



	15	9.25	6.75	1.25	10.3	16	3.2	Closed and Ground	DIN 2095, DIN 2098, DIN 17223	5	000000000	00000


	Corrosion-Resistant 302 Stainless Steel



			15	4.5	3.5	0.5	7.1	1.7	0.22	Closed	DIN 2095	5	00000000	00000


			15	9.25	6.75	1.25	7.4	19	2.7	Closed and Ground	DIN 2095	5	00000000	00000


			Highly Corrosion-Resistant 316 Stainless Steel



					15	2	1.4	0.3	10.6	0.6	0.15	Closed	—	1	00000000	0000


					15	2	1.5	0.25	9.4	0.3	0.07	Closed	—	1	00000000	0000
					15	2	1.6	0.2	8.1	0.2	0.03	Closed	—	1	00000000	0000
					15	2.5	1.9	0.3	9.2	0.5	0.09	Closed	—	1	00000000	0000
					15	2.5	2	0.25	8.2	0.3	0.04	Closed	—	1	00000000	0000
					15	3	2.4	0.3	8.2	0.4	0.06	Closed	—	1	00000000	0000
					15	3	2.5	0.25	7.3	0.2	0.03	Closed	—	1	0000000	0000
					15	4.5	3.5	0.5	8.7	1.4	0.22	Closed and Ground	—	1	00000000	0000
					15	9.25	6.75	1.27	11.3	9.8	2.7	Closed and Ground	—	1	00000000	0000

Extension Springs

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.

Loop End—The most secure attachment method. With fully closed loops, there's no risk of slipping off.

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.

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 extend 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 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.
Loop End







				Spring Steel

				15	5.5	0.8	21.4	1.22	6.79	0.9	2	00000000	000000




						Corrosion-Resistant 302 Stainless Steel

						15	5.5	0.8	21.4	1.22	5.66	0.75	2	00000000	00000


						Hook End







										Corrosion-Resistant 302 Stainless Steel

										15	5.5	0.8	21.4	1.21	5.67	0.75	2	00000000	00000




												Highly Corrosion-Resistant 316 Stainless Steel

												15	2	0.25	32.2	0.06	0.76	0.04	5	0000000	00000


												15	3	0.3	37.7	0.08	0.84	0.03	5	0000000	00000
												15	4	0.3	48.5	0.06	0.61	0.02	5	0000000	00000