38.5mm Springs | McMaster-Carr

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

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

Metric

											Pkg.
OD, mm	ID, mm	Wire Dia., mm	Compressed Lg. @ Max. Load, mm	Max. Load, lbs.	Spring Rate, lbs./mm	Material	End Type	Specifications Met	Pkg. Qty.		1-49	50-249	250-Up
38.5 mm Lg.
12	8	2	27.88	46.81	4.406	Music-Wire Steel	Closed and Ground	DIN 17223, DIN 2095, DIN 2098	5	000000000	000000	000000	00000

Corrosion-Resistant Compression Springs

These springs are more corrosion resistant than standard compression springs. They're also easier to compress than standard compression springs. As you squeeze a compression spring, it pushes back to return to its original length. Spring rate is the amount of force required for every inch of compression or, for metric springs, millimeter of compression. The higher the spring rate, the harder it is to compress the spring.

302 stainless steel springs have good corrosion resistance.

316 stainless steel springs have excellent corrosion resistance.

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

Metric

38.5 mm Lg.
OD, mm	ID, mm	Wire Dia., mm	Compressed Lg. @ Max. Load, mm	Max. Load , lbs.	Spring Rate, lbs./mm	Material	End Type	Specifications Met	Pkg. Qty.		Pkg.
5.63	4.37	0.63	16.2	2.9	0.13	302 Stainless Steel	Closed	DIN 2095	5	00000000	000000
5.63	4.37	0.63	22.098	2.1	0.13	Passivated 316 Stainless Steel	Closed and Ground	__	1	00000000	0000
12	8	2.03	31.242	28.5	3.64	Passivated 316 Stainless Steel	Closed and Ground	__	1	00000000	0000

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 spring 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.

Metric

38.5 mm Lg.
OD, mm	OD Tolerance, mm	ID, mm	Wire Dia., mm	Compressed Lg. @ Max. Load, mm	Max. Load, lbs.	Spring Rate, lbs./mm	Spring Rate Tolerance, lbs./mm	Material	End Type	Pkg. Qty.		Pkg.
12	-0.4 to 0.4	8	2	30.256	31.56	3.83	-0.38 to 0.38	302 Stainless Steel	Closed and Ground	3	0000000	000000
12	-0.4 to 0.4	8	2	31.55	26.62	3.83	-0.38 to 0.38	316 Stainless Steel	Closed and Ground	1	0000000	0000

Extension Springs with Loop Ends

As you stretch an extension spring, it gets harder to pull. Minimum load is the amount of force required to start to extend the spring. Maximum load is the amount of force required to fully extend the spring. Spring rate is the amount of force required for every inch or millimeter of extension.

Metric

			Load, lbs.
OD, mm	Wire Dia., mm	Extended Lg. @ Max. Load, mm	Min.	Max.	Spring Rate, lbs./mm	Material	Pkg. Qty.		Pkg.
38.5 mm Lg.
7.5	0.7	106	0.38	3.46	0.045	Music-Wire Steel	2	00000000	000000