41mm 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.

	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



	41	18.5	13.5	2.5	20.5	68	3.3	Closed and Ground	DIN 2095	2	2006N345	000000


	41	22	18	2	13.6	29	1.1	Closed and Ground	DIN 2095	5	2006N344	00000
	41	29	21	4	22.9	155	8.9	Closed and Ground	DIN 2095	1	2006N346	00000
	41	30	20	5	27.6	290	22	Closed and Ground	DIN 2095	1	2006N347	00000

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.

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

				41	8.5	1.2	65.6	2.59	14.12	0.49	2	3630N21	000000


				Hook End







								Spring Steel

								41	8.5	1.2	65.6	2.59	14.11	0.49	2	7678N293	00000




										Corrosion-Resistant 302 Stainless Steel

										41	8.5	1.2	65.6	2.59	11.76	0.41	2	1942N483	00000

Corrosion-Resistant Extension Spring Stud Anchors

These stainless steel stud anchors offer excellent corrosion resistance. Attach an extension spring to an anchor and then thread the anchor into your part for a secure connection.

	Thread
	Size	Min. Lg., mm	Spacing	Lg., mm	Dia., mm	Hole Dia., mm		Each
18-8 Stainless Steel



		M10 × 1.5 mm	28	Coarse	41	10	6	95907A210	000000

Extension Spring Stud Anchors

Black-oxide steel anchors create a rigid, adjustable mounting point for extension springs that won't shift under load. Thread them into your part for a secure connection that outperforms hooks and loops. Steel construction handles repeated spring tension without deforming, and the black-oxide finish provides mild corrosion resistance.

	Thread
	Size	Min. Lg., mm	Spacing	Lg., mm	Dia., mm	Hole Dia., mm		Each
Black-Oxide Steel



		M10 × 1.5 mm	28	Coarse	41	10	6	9634K43	00000

Corrosion-Resistant Swiveling Extension Spring Stud Anchors

These stainless steel stud anchors offer excellent corrosion resistance. The head swivels 360° so the spring stays straight and properly coiled. Attach an extension spring to an anchor and then thread the anchor into your part for a secure connection. To make tightening easier, anchors have a hex socket on the bottom and wrench flats at the top of the threads.

	Thread
	Size	Min. Lg., mm	Spacing	Lg., mm	Dia., mm	Hole Dia., mm	Hex Size, mm		Each
18-8 Stainless Steel



		M10 × 1.5 mm	28	Coarse	41	10	6	3	96376A610	000000

Swiveling Extension Spring Stud Anchors

A black-oxide finish provides these steel anchors with mild corrosion resistance. The head swivels 360° so the spring stays straight and properly coiled. Attach an extension spring to an anchor and then thread the anchor into your part for a secure connection. To make tightening easier, anchors have a hex socket on the bottom and wrench flats at the top of the threads.

	Thread
	Size	Min. Lg., mm	Spacing	Lg., mm	Dia., mm	Hole Dia., mm	Hex Size, mm		Each
Black-Oxide Steel



		M10 × 1.5 mm	28	Coarse	41	10	6	3	97745A210	000000