Thickness Thickness |
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OD OD |
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ID ID |
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Load Load |
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Extended Length Extended Length |
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Maximum Torque Maximum Torque |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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Useful Life Useful Life |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Constant-Force Springs
No matter how far you extend them, these springs pull back with the same amount of force. Compact and tightly coiled, these springs extend to multiple times their length to pull objects in a linear direction. All are stainless steel for corrosion resistance. Please allow for 1 1/2 coils on the shaft at full extension to hold the spring in place.
For technical drawings and 3-D models, click on a part number.
| Extended Lg. | Load, lbs. | Load Tolerance, lbs. | Thick. | Wd. | ID | ID Tolerance | OD | OD Tolerance | Mounting Hole Dia. | Number of Mounting Holes | Material | Each | |
3,000 Cycles of Useful Life | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12" | 0.37 | -0.04 to 0.04 | 0.003" | 0.187" | 0.21" | -0.03" to 0.03" | 0.3" | -0.03" to 0.03" | 0.096" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 12" | 1.23 | -0.12 to 0.12 | 0.005" | 0.375" | 0.36" | -0.032" to 0.03" | 0.47" | -0.03" to 0.03" | 0.131" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 15" | 0.49 | -0.05 to 0.05 | 0.004" | 0.187" | 0.29" | -0.03" to 0.03" | 0.4" | -0.04" to 0.04" | 0.096" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 15" | 0.66 | -0.07 to 0.07 | 0.004" | 0.25" | 0.28" | -0.03" to 0.03" | 0.4" | -0.04" to 0.04" | 0.13" | 1 | 301 Stainless Steel | 0000000 | 0000 |
| 15" | 0.83 | -0.09 to 0.09 | 0.004" | 0.312" | 0.28" | -0.03" to 0.03" | 0.4" | -0.04" to 0.04" | 0.13" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 17" | 1.03 | -0.11 to 0.11 | 0.005" | 0.312" | 0.37" | -0.04" to 0.04" | 0.5" | -0.05" to 0.05" | 0.13" | 1 | 301 Stainless Steel | 0000000 | 0000 |
| 18" | 0.75 | -0.08 to 0.08 | 0.005" | 0.31" | 0.42" | -0.05" to 0.05" | 0.56" | -0.06" to 0.06" | 0.131" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 22" | 1.12 | -0.12 to 0.12 | 0.006" | 0.37" | 0.51" | -0.06" to 0.06" | 0.62" | -0.07" to 0.07" | 0.131" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 22" | 2.3 | -0.23 to 0.23 | 0.007" | 0.5" | 0.5" | -0.032" to 0.03" | 0.72" | -0.03" to 0.03" | 0.191" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 22" | 2.87 | -0.28 to 0.28 | 0.007" | 0.625" | 0.5" | -0.04" to 0.04" | 0.71" | -0.03" to 0.03" | 0.191" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 24" | 1.48 | -0.15 to 0.15 | 0.006" | 0.375" | 0.45" | -0.05" to 0.05" | 0.62" | -0.07" to 0.07" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 24" | 4 | -0.4 to 0.40 | 0.009" | 0.75" | 0.62" | -0.07" to 0.07" | 0.82" | -0.09" to 0.09" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 24" | 4.93 | -0.49 to 0.49 | 0.012" | 0.625" | 0.86" | -0.04" to 0.04" | 1.05" | -0.03" to 0.03" | 0.191" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 25" | 1.97 | -0.2 to 0.20 | 0.006" | 0.5" | 0.45" | -0.05" to 0.05" | 0.65" | -0.07" to 0.07" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 26" | 1.62 | -0.17 to 0.17 | 0.007" | 0.5" | 0.59" | -0.06" to 0.06" | 0.75" | -0.08" to 0.08" | 0.131" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 28" | 6.88 | -0.69 to 0.69 | 0.014" | 0.75" | 1" | -0.04" to 0.04" | 1.28" | -0.03" to 0.03" | 0.191" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 28" | 9.19 | -0.92 to 0.92 | 0.014" | 1" | 1" | -0.05" to 0.05" | 1.23" | -0.03" to 0.03" | 0.191" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 30" | 2.63 | -0.27 to 0.27 | 0.008" | 0.5" | 0.59" | -0.06" to 0.06" | 0.82" | -0.09" to 0.09" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 30" | 3.29 | -0.33 to 0.33 | 0.008" | 0.625" | 0.61" | -0.07" to 0.07" | 0.83" | -0.09" to 0.09" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 32" | 14.76 | -1.5 to 1.50 | 0.018" | 1.25" | 1.3" | -0.06" to 0.06" | 1.65" | -0.03" to 0.03" | 0.191" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 32" | 17.71 | -1.7 to 1.70 | 0.018" | 1.5" | 1.3" | -0.08" to 0.08" | 1.65" | -0.03" to 0.03" | 0.256" | 2 | 301 Stainless Steel | 00000000 | 0000 |
| 33" | 4.12 | -0.42 to 0.42 | 0.01" | 0.625" | 0.73" | -0.08" to 0.08" | 0.99" | -0.1" to 0.10" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 33" | 4.95 | -0.5 to 0.50 | 0.01" | 0.75" | 0.71" | -0.08" to 0.08" | 0.97" | -0.1" to 0.10" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 34" | 3.5 | -0.35 to 0.35 | 0.01" | 0.68" | 0.85" | -0.09" to 0.09" | 1.12" | -0.12" to 0.12" | 0.187" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 36" | 28.71 | -2.87 to 2.87 | 0.025" | 1.75" | 1.8" | -0.13" to 0.13" | 2.15" | -0.03" to 0.03" | 0.256" | 2 | 301 Stainless Steel | 0000000 | 0000 |
| 36" | 32.81 | -3.28 to 3.28 | 0.025" | 2" | 1.8" | -0.13" to 0.13" | 2.1" | -0.03" to 0.03" | 0.256" | 2 | 301 Stainless Steel | 00000000 | 00000 |
| 38" | 5 | -0.5 to 0.50 | 0.012" | 0.81" | 1.02" | -0.11" to 0.11" | 1.4" | -0.14" to 0.14" | 0.187" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 39" | 5.94 | -0.6 to 0.60 | 0.012" | 0.75" | 0.88" | -0.09" to 0.09" | 1.19" | -0.12" to 0.12" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 39" | 7.92 | -0.8 to 0.80 | 0.012" | 1" | 0.88" | -0.09" to 0.09" | 1.2" | -0.12" to 0.12" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 40" | 10.6 | -1.06 to 1.06 | 0.016" | 1" | 1.2" | -0.12" to 0.12" | 1.52" | -0.16" to 0.16" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 43" | 7 | -0.7 to 0.70 | 0.014" | 1" | 1.19" | -0.12" to 0.12" | 1.5" | -0.15" to 0.15" | 0.187" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 50" | 16.5 | -1.65 to 1.65 | 0.02" | 1.25" | 1.47" | -0.15" to 0.15" | 1.89" | -0.19" to 0.19" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 52" | 24.8 | -2.48 to 2.48 | 0.025" | 1.5" | 1.77" | -0.18" to 0.18" | 2.23" | -0.23" to 0.23" | 0.265" | 2 | 301 Stainless Steel | 0000000 | 00000 |
| 52" | 33 | -0.33 to 0.33 | 0.025" | 2" | 1.78" | -0.18" to 0.18" | 2.22" | -0.22" to 0.22" | 0.265" | 2 | 301 Stainless Steel | 00000000 | 00000 |
| 60" | 40.9 | -4.09 to 4.09 | 0.031" | 2" | 2.5" | -0.25" to 0.25" | 3.03" | -0.31" to 0.31" | 0.265" | 2 | 301 Stainless Steel | 0000000 | 00000 |
25,000 Cycles of Useful Life | |||||||||||||
| 18" | 0.23 | -0.03 to 0.03 | 0.004" | 0.25" | 0.53" | -0.06" to 0.06" | 0.62" | -0.07" to 0.07" | 0.13" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 18" | 0.36 | -0.04 to 0.04 | 0.005" | 0.312" | 0.69" | -0.07" to 0.07" | 0.78" | -0.08" to 0.08" | 0.13" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 25" | 0.43 | -0.05 to 0.05 | 0.005" | 0.375" | 0.65" | -0.07" to 0.07" | 0.78" | -0.08" to 0.08" | 0.13" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 25" | 0.52 | -0.06 to 0.06 | 0.006" | 0.375" | 0.7" | -0.07" to 0.07" | 0.9" | -0.09" to 0.09" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 0000 |
| 25" | 0.7 | -0.07 to 0.07 | 0.006" | 0.5" | 0.8" | -0.08" to 0.08" | 0.92" | -0.1" to 0.10" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 0000 |
| 33" | 0.93 | -0.1 to 0.10 | 0.008" | 0.5" | 1.07" | -0.11" to 0.11" | 1.23" | -0.13" to 0.13" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 0000 |
| 35" | 1.46 | -0.15 to 0.15 | 0.01" | 0.625" | 1.36" | -0.14" to 0.14" | 1.53" | -0.16" to 0.16" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 45" | 2.09 | -0.21 to 0.21 | 0.012" | 0.75" | 1.6" | -0.16" to 0.16" | 1.82" | -0.19" to 0.19" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 45" | 2.8 | -0.28 to 0.28 | 0.012" | 1" | 1.6" | -0.16" to 0.16" | 1.84" | -0.19" to 0.19" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 46" | 4.1 | -0.41 to 0.41 | 0.016" | 1" | 1.96" | -0.2" to 0.20" | 2.21" | -0.23" to 0.23" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 48" | 3.5 | -0.35 to 0.35 | 0.015" | 1" | 1.96" | -0.2" to 0.20" | 2.2" | -0.22" to 0.22" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 48" | 3.86 | -0.39 to 0.39 | 0.016" | 1.25" | 2.28" | -0.8" to 0.80" | 2.55" | -0.03" to 0.03" | 0.191" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 48" | 4.37 | -0.44 to 0.44 | 0.015" | 1.25" | 2.03" | -0.21" to 0.21" | 2.29" | -0.23" to 0.23" | 0.196" | 1 | 301 Stainless Steel | 00000000 | 00000 |
| 48" | 5.21 | -0.52 to 0.52 | 0.018" | 1.5" | 2.6" | -0.13" to 0.13" | 2.92" | -0.03" to 0.03" | 0.256" | 2 | 301 Stainless Steel | 00000000 | 00000 |
| 55" | 5.83 | -0.59 to 0.59 | 0.02" | 1.25" | 2.53" | -0.26" to 0.26" | 2.82" | -0.29" to 0.29" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 56" | 7.24 | -0.72 to 0.72 | 0.025" | 1.5" | 3.6" | -0.13" to 0.13" | 3.75" | -0.03" to 0.03" | 0.256" | 2 | 301 Stainless Steel | 00000000 | 00000 |
| 60" | 8.74 | -0.88 to 0.88 | 0.025" | 1.5" | 3.35" | -0.34" to 0.34" | 3.7" | -0.37" to 0.37" | 0.265" | 2 | 301 Stainless Steel | 0000000 | 00000 |
| 60" | 11.7 | -1.17 to 1.17 | 0.025" | 2" | 3.37" | -0.34" to 0.34" | 3.68" | -0.37" to 0.37" | 0.265" | 2 | 301 Stainless Steel | 00000000 | 00000 |
| 70" | 14.4 | -1.44 to 1.44 | 0.031" | 2" | 4.35" | -0.44" to 0.44" | 4.74" | -0.48" to 0.48" | 0.265" | 2 | 301 Stainless Steel | 0000000 | 00000 |
50,000 Cycles of Useful Life | |||||||||||||
| 30" | 0.44 | -0.07 to 0.07 | 0.006" | 0.5" | 1" | -0.1" to 0.10" | 1.22" | -0.13" to 0.13" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 0000 |
| 36" | 0.58 | -0.09 to 0.09 | 0.008" | 0.5" | 1.49" | -0.15" to 0.15" | 1.61" | -0.17" to 0.17" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 0000 |
| 40" | 0.91 | -0.14 to 0.14 | 0.01" | 0.625" | 1.86" | -0.19" to 0.19" | 2" | -0.2" to 0.20" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 0000 |
| 50" | 1.31 | -0.2 to 0.20 | 0.012" | 0.75" | 2.24" | -0.23" to 0.23" | 2.4" | -0.24" to 0.24" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 52" | 2.32 | -0.35 to 0.35 | 0.016" | 1" | 2.98" | -0.3" to 0.30" | 3.15" | -0.32" to 0.32" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 62" | 3.63 | -0.54 to 0.54 | 0.02" | 1.25" | 3.73" | -0.38" to 0.38" | 3.94" | -0.4" to 0.40" | 0.196" | 1 | 301 Stainless Steel | 0000000 | 00000 |
| 66" | 5.44 | -0.82 to 0.82 | 0.025" | 1.5" | 4.66" | -0.47" to 0.47" | 4.88" | -0.49" to 0.49" | 0.265" | 2 | 301 Stainless Steel | 0000000 | 00000 |
| 78" | 8.99 | -1.35 to 1.35 | 0.031" | 2" | 5.77" | -0.58" to 0.58" | 6.04" | -0.61" to 0.61" | 0.265" | 2 | 301 Stainless Steel | 0000000 | 00000 |
Variable-Force Springs
Compared to constant-force springs, these are easier to pull at first but become harder to pull the farther you extend them. Use them for applications where the load becomes lighter as the spring contracts, such as in automated dispensing machines. All are stainless steel for corrosion resistance. Please allow for 1 1/2 coils on the shaft at full extension to hold the spring in place.
For technical drawings and 3-D models, click on a part number.
| Load, lbs. | Extended Lg. | Thick. | Wd. | ID | OD | Mounting Hole Dia. | Number of Mounting Holes | Material | Each | |
5,000 Cycles of Useful Life | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 0.5-1.00 | 22" | 0.0045" | 0.5" | 0.4" | 0.85" | 0.191" | 1 | 301 Stainless Steel | 000000 | 00000 |
| 0.55-1.20 | 28" | 0.0045" | 0.5" | 0.4" | 0.73" | 0.191" | 1 | 301 Stainless Steel | 000000 | 0000 |
| 0.75-1.50 | 22" | 0.005" | 0.5" | 0.5" | 0.8" | 0.191" | 1 | 301 Stainless Steel | 000000 | 0000 |
| 0.9-1.80 | 22" | 0.007" | 0.5" | 0.5" | 1.125" | 0.191" | 1 | 301 Stainless Steel | 000000 | 0000 |
| 1-2.20 | 22" | 0.007" | 0.5" | 0.55" | 1.03" | 0.191" | 1 | 301 Stainless Steel | 0000000 | 0000 |
| 1-2.20 | 28" | 0.007" | 0.5" | 0.55" | 0.95" | 0.191" | 1 | 301 Stainless Steel | 000000 | 0000 |
| 1.5-2.60 | 22" | 0.008" | 0.5" | 0.63" | 1.2" | 0.191" | 1 | 301 Stainless Steel | 0000000 | 0000 |
| 1.5-2.60 | 28" | 0.008" | 0.5" | 0.63" | 1.275" | 0.191" | 1 | 301 Stainless Steel | 000000 | 0000 |
| 1.75-3.30 | 22" | 0.01" | 0.5" | 0.98" | 1.38" | 0.191" | 1 | 301 Stainless Steel | 0000000 | 0000 |
| 1.75-3.30 | 28" | 0.01" | 0.5" | 0.98" | 1.46" | 0.191" | 1 | 301 Stainless Steel | 000000 | 0000 |
| 2-4.00 | 28" | 0.012" | 0.5" | 0.95" | 1.55" | 0.191" | 1 | 301 Stainless Steel | 000000 | 0000 |
7,500 Cycles of Useful Life | ||||||||||
| 0.55-1.00 | 28" | 0.0045" | 0.5" | 0.4" | 0.8" | 0.191" | 1 | 301 Stainless Steel | 000000 | 0000 |
Clip-On Constant-Force Springs
Clip the end onto a flat surface to install—no fasteners needed. Once installed, these springs pull back with the same amount of force no matter how far you extend them. Compact and tightly coiled, they extend to multiple times their length to pull objects in a linear direction. All are stainless steel for corrosion resistance. When using, please allow for 1 1/2 extra coils on the shaft at full extension to hold the spring in place.
For technical drawings and 3-D models, click on a part number.
| Extended Lg. | Load, lbs. | Load Tolerance, lbs. | Thick. | Wd. | ID | ID Tolerance | OD | OD Tolerance | For Max. Mounting Surface Thick. | Material | Each | |
5,000 Cycles of Useful Life | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 24" | 1.5 | -0.15 to 0.15 | 0.006" | 0.5" | 0.53" | -0.05" to 0.05" | 0.68" | -0.031" to 0.03" | 0.138" | 301 Stainless Steel | 000000 | 00000 |
| 24" | 1.75 | -0.17 to 0.17 | 0.007" | 0.5" | 0.63" | -0.05" to 0.05" | 0.725" | -0.031" to 0.03" | 0.136" | 301 Stainless Steel | 000000 | 0000 |
13,000 Cycles of Useful Life | ||||||||||||
| 24" | 0.2 | -0.02 to 0.02 | 0.003" | 0.25" | 0.35" | -0.02" to 0.02" | 0.45" | -0.031" to 0.03" | 0.119" | 301 Stainless Steel | 000000 | 0000 |
| 24" | 0.4 | -0.04 to 0.04 | 0.004" | 0.25" | 0.4" | -0.04" to 0.04" | 0.55" | -0.031" to 0.03" | 0.117" | 301 Stainless Steel | 000000 | 0000 |
| 24" | 0.6 | -0.06 to 0.06 | 0.005" | 0.25" | 0.45" | -0.05" to 0.05" | 0.6" | -0.031" to 0.03" | 0.115" | 301 Stainless Steel | 000000 | 0000 |
| 24" | 0.8 | -0.08 to 0.08 | 0.005" | 0.312" | 0.5" | -0.05" to 0.05" | 0.675" | -0.031" to 0.03" | 0.115" | 301 Stainless Steel | 000000 | 0000 |
| 24" | 1 | -0.1 to 0.10 | 0.006" | 0.312" | 0.51" | -0.05" to 0.05" | 0.6" | -0.031" to 0.03" | 0.138" | 301 Stainless Steel | 000000 | 0000 |
| 24" | 1.25 | -0.12 to 0.12 | 0.006" | 0.375" | 0.55" | -0.05" to 0.05" | 0.675" | -0.031" to 0.03" | 0.138" | 301 Stainless Steel | 000000 | 0000 |
Rotor Springs
Wind these springs to store power, then release them to create rotary motion—similar to winding a wristwatch. Also known as clock springs and power springs. All are stainless steel for corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| Max. Torque, in.-lbs. | For Shaft Dia. | OD | Wd. | Thick. | Number of Turns | Material | Each | |
| 0.41 | 1/4" | 1.5" | 0.5" | 0.004" | 44 | 301 Stainless Steel | 000000 | 000000 |
| 0.73 | 1/4" | 1" | 0.25" | 0.0075" | 11.5 | 301 Stainless Steel | 000000 | 00000 |
| 0.93 | 1/4" | 1.5" | 0.5" | 0.006" | 30 | 301 Stainless Steel | 000000 | 00000 |
| 1.65 | 1/4" | 1.5" | 0.5" | 0.008" | 22 | 301 Stainless Steel | 000000 | 00000 |
| 2.58 | 1/4" | 1.5" | 0.5" | 0.01" | 17 | 301 Stainless Steel | 000000 | 00000 |
| 4.2 | 5/8" | 2.8" | 0.25" | 0.018" | 14 | 301 Stainless Steel | 000000 | 00000 |
| 4.32 | 1/4" | 1.5" | 0.5" | 0.013" | 11.5 | 301 Stainless Steel | 000000 | 00000 |
| 4.5 | 1/4" | 1.8" | 0.375" | 0.016" | 12 | 301 Stainless Steel | 000000 | 00000 |
| 7 | 1/4" | 1.8" | 0.375" | 0.02" | 9 | 301 Stainless Steel | 000000 | 00000 |
| 8.3 | 5/8" | 3" | 0.5" | 0.018" | 16.5 | 301 Stainless Steel | 0000000 | 000000 |