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SR : 0.726-147.1N Load

Springs » Constant Force Extension Springs »
SR : Standard Extension Springs (Ave. Fatigue Life of 5,000 Cycles)

SR : Standard Extension Springs (Ave. Fatigue Life of 5,000 Cycles)

Discounts 1+ 0% 10+ 5% 25+ 10% 50+ 15% 100+ 20%

Part
Number		 Load ±10% Extension Spring Material D2 D1 H J I/D*
Spring		 Spring
Ends†		 Cost Quantity Add to
Basket
Newtons Kg W T* L
SR1 0.726 0.074 177 3.175 0.051 203 4.42 5.77 4.17 7.21 3.68 E £2.29
SR2 1.100 0.112 264 3.175 0.076 305 6.63 8.64 6.17 10.80 5.53 E £2.29
SR3 1.460 0.149 177 6.350 0.051 203 4.42 5.77 4.17 7.21 3.68 E £2.29
SR4 2.190 0.223 353 4.760 0.102 406 8.86 11.56 8.26 14.45 7.39 E £2.29
SR5 2.750 0.280 264 7.940 0.076 305 6.63 8.64 6.17 10.80 5.53 E £2.46
SR6 4.380 0.447 353 9.520 0.102 406 8.86 11.56 8.26 14.45 7.39 D £2.46
SR7 5.470 0.558 442 9.520 0.127 508 11.07 14.48 10.34 18.09 9.22 D £3.07
SR8 7.310 0.745 442 12.700 0.127 508 11.07 14.48 10.34 18.09 9.22 D £3.07
SR9 8.770 0.894 529 12.700 0.152 610 13.28 17.34 12.39 21.69 11.07 A £4.15
SR10 10.980 1.120 529 15.880 0.152 610 13.28 17.34 12.39 21.69 11.07 A £5.16
SR11 13.140 1.340 706 14.290 0.203 813 17.70 23.11 16.51 28.96 14.75 A £4.41
SR12 18.240 1.860 882 15.880 0.254 1016 22.17 28.96 20.70 36.32 18.47 A £5.05
SR13 21.970 2.240 882 19.050 0.254 1016 22.17 28.96 20.70 36.32 18.47 A £5.28
SR14 26.280 2.680 1060 19.050 0.305 1219 26.27 34.80 24.89 43.43 22.17 A £6.97
SR15 30.690 3.130 1237 19.050 0.356 1422 30.99 40.39 28.70 50.55 25.91 A £7.20
SR16 35.110 3.580 1060 25.400 0.305 1219 26.27 34.80 24.89 43.43 22.17 C £7.10
SR17 40.890 4.170 1237 25.400 0.356 1422 30.99 40.39 28.70 50.55 25.91 C £8.25
SR18 47.070 4.800 1412 25.400 0.406 1626 35.56 46.23 33.02 57.91 29.46 C £9.10
SR19 52.860 5.390 1600 25.400 0.457 1829 39.62 52.32 37.08 65.53 33.27 C £11.01
SR20 61.780 6.300 1237 38.100 0.356 1422 30.99 40.39 28.70 50.55 25.91 F £9.99
SR21 70.120 7.150 1060 50.800 0.305 1219 26.67 34.80 24.89 43.43 22.17 F £9.59
SR22 79.040 8.060 1600 38.100 0.457 1829 39.62 52.32 73.08 65.53 33.27 F £13.17
SR23 93.650 9.550 1412 50.800 0.406 1626 35.56 46.23 33.02 57.91 29.46 F £18.41
SR24 109.830 11.200 2210 38.100 0.635 2540 55.37 72.39 51.82 90.42 46.23 G £25.69
SR25 128.470 13.100 1950 50.800 0.559 2235 48.77 64.26 45.72 80.26 40.64 K £26.53
SR26 147.100 15.000 2210 50.800 0.635 2540 55.37 72.39 51.82 90.42 46.23 K £30.78
*reference only, may be varied to meet load specification. †See technical pages for spring end options.

Material
Spring: Type 301 High Yield Stainless Steel
Average fatigue life of 5,000 cycles

W = Spring material width
T = Spring material thickness
L = Spring length (reference only)
J = Minimum extension for constant force
H = Off-set distance
D2 = Storage drum diameter
D1 = Outside diameter of spring when fully wound on storage drum

Other Info.
Constant force extension springs provide a huge range of application opportunities.
Springs can be extended in excess of 50 times the relaxed length of the spring,
  and can be mounted on a bobbin or bush or free running in a cavity or recess.
Springs can be joined or laminated to provide increased force with minimal increases in space requirements.

Downloads
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