McMaster-Carr

As you squeeze a compression spring, it pushes back to return to its original length. Rate is the amount of force required for every inch of compression or, for metric springs, millimeter of compression. The higher the rate, the harder it is to compress the spring.

Springs with closed and ground ends sit flat, so they won’t buckle.

For technical drawings and 3-D models, click on a part number.

Metric

38.5 mm Lg.
OD, mm	ID, mm	Wire Dia., mm	Compressed Lg. @ Max. Load, mm	Max. Load, lbs.	Rate, lbs./mm	Material	End Type	Specifications Met	Pkg. Qty.		Pkg.
12	8	2	21	75.46	4.406	Music-Wire Steel	Closed and Ground	DIN 17223, DIN 2095, DIN 2098	5	000000000	000000

Corrosion-Resistant Precision Compression Springs

Made of stainless steel, these springs are more corrosion resistant than steel compression springs. They’re also easier to compress than steel compression springs. Use where tight OD and rate tolerances are required. Closed and ground ends allow the springs to sit flat, so they won’t buckle.

302 stainless steel springs have good corrosion resistance.

316 stainless steel springs have excellent corrosion resistance.

For technical drawings and 3-D models, click on a part number.

Metric

38.5 mm Lg.
OD, mm	OD Tolerance, mm	ID, mm	Wire Dia., mm	Compressed Lg. @ Max. Load, mm	Max. Load, lbs.	Rate, lbs./mm	Rate Tolerance, lbs./mm	Material	End Type	Pkg. Qty.		Pkg.
12	-0.4 to 0.4	8	2	21	67	3.83	-0.38 to 0.38	302 Stainless Steel	Closed and Ground	3	0000000	000000
12	-0.4 to 0.4	8	2	21	67	3.83	-0.38 to 0.38	316 Stainless Steel	Closed and Ground	1	0000000	0000

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