40.5mm 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.

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



	40.5	9	7	1	18.1	8	0.36	Closed and Ground	DIN 2095, DIN 2098, DIN 17223	5	94125K636	00000


	Corrosion-Resistant 302 Stainless Steel



			40.5	9	7	1	19.9	6.2	0.3	Closed and Ground	DIN 2095	5	2006N341	00000


			40.5	11.6	8.4	1.6	18.9	31	1.5	Closed and Ground	DIN 2095	5	2006N343	00000
			40.5	17.25	14.75	1.25	9.1	10	0.32	Closed and Ground	DIN 2095	5	2006N342	00000


			Highly Corrosion-Resistant 316 Stainless Steel



					40.5	9	7	1	23.9	5	0.3	Closed and Ground	—	1	8969T758	0000


					40.5	17.25	14.75	1.27	23.9	5.4	0.32	Closed and Ground	—	1	8969T871	0000