76 mm Springs | McMaster-Carr

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.
76 mm Lg.
28	4	101.4	29.41	126.79	4.226	Music-Wire Steel	1	00000000	000000

Metric Color-Coded Die Springs

The colors and sizes of these springs follow ISO 10243 for metric die springs. Made of chrome-silicon steel, they have high tensile strength for reliable, long-lasting operation in repetitive applications, such as punching and stamping. All have closed and ground ends, which provide a flat mounting surface for even movement and distribution of loads.

Deflection is the distance the spring compresses, expressed as a percentage of its length.

As you squeeze a die spring, it gets harder to push. Spring rate is the amount of force required for every millimeter of compression. The higher the spring rate, the harder it is to compress the spring.

	Wire
Lg., mm	Thick., mm	Wd., mm	Compressed Lg. @ Max. Load, mm	Deflection @ Max. Load	Max. Load, lbs.	Spring Rate, lbs./mm	Material	End Type		Each
Green (Light Load Rating)
For 12.5 mm Hole Dia. (For 6 mm Shaft Dia.)
76	1.32	2.36	49.4	35%	42	1.5	Chrome-Silicon Steel	Closed and Ground	0000000	00000
For 20 mm Hole Dia. (For 10 mm Shaft Dia.)
76	1.91	4.19	49.4	35%	95	3.5	Chrome-Silicon Steel	Closed and Ground	00000000	0000
For 25 mm Hole Dia. (For 12.5 mm Shaft Dia.)
76	2.54	5.46	49.4	35%	167	6.2	Chrome-Silicon Steel	Closed and Ground	00000000	00000
For 32 mm Hole Dia. (For 16 mm Shaft Dia.)
76	2.92	7.24	49.4	35%	263	9.8	Chrome-Silicon Steel	Closed and Ground	00000000	00000
For 40 mm Hole Dia. (For 20 mm Shaft Dia.)
76	3.43	8.76	49.4	35%	376	14.1	Chrome-Silicon Steel	Closed and Ground	00000000	00000
For 50 mm Hole Dia. (For 25 mm Shaft Dia.)
76	4.95	11.89	49.4	35%	747	28	Chrome-Silicon Steel	Closed and Ground	00000000	00000
For 63 mm Hole Dia. (For 38 mm Shaft Dia.)
76	7.75	11.51	49.4	35%	1,130	42	Chrome-Silicon Steel	Closed and Ground	00000000	00000
Blue (Medium Load Rating)
For 20 mm Hole Dia. (For 10 mm Shaft Dia.)
76	2.36	3.96	53.2	30%	128	5.6	Chrome-Silicon Steel	Closed and Ground	00000000	0000
For 25 mm Hole Dia. (For 12.5 mm Shaft Dia.)
76	2.92	5.54	53.2	30%	221	9.7	Chrome-Silicon Steel	Closed and Ground	00000000	00000
For 40 mm Hole Dia. (For 20 mm Shaft Dia.)
76	4.75	7.92	53.2	30%	553	24	Chrome-Silicon Steel	Closed and Ground	00000000	00000
Red (Heavy Load Rating)
For 20 mm Hole Dia. (For 10 mm Shaft Dia.)
76	3.18	4.19	57	25%	255	13.4	Chrome-Silicon Steel	Closed and Ground	0000000	0000
For 25 mm Hole Dia. (For 12.5 mm Shaft Dia.)
76	4.01	5.61	57	25%	422	22	Chrome-Silicon Steel	Closed and Ground	00000000	00000
For 32 mm Hole Dia. (For 16 mm Shaft Dia.)
76	5.08	7.26	57	25%	734	38	Chrome-Silicon Steel	Closed and Ground	00000000	00000
Yellow (Extra Heavy Load Rating)
For 20 mm Hole Dia. (For 10 mm Shaft Dia.)
76	4.09	4.06	60.8	20%	279	18.3	Chrome-Silicon Steel	Closed and Ground	00000000	0000
For 25 mm Hole Dia. (For 12.5 mm Shaft Dia.)
76	4.95	5.49	60.8	20%	446	29	Chrome-Silicon Steel	Closed and Ground	00000000	00000
For 32 mm Hole Dia. (For 16 mm Shaft Dia.)
76	6.20	7.32	60.8	20%	746	49	Chrome-Silicon Steel	Closed and Ground	00000000	00000