System of Measurement System of Measurement |
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Spring Type Spring Type |
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![]() | Extension |
Length Length | Show |
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Length Length | Hide |
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Spring Rate Spring Rate |
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Load Load |
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Material Material |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Maximum Spring Rate Tolerance Maximum SpringRate Tolerance |
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Minimum Spring Rate Tolerance Minimum SpringRate Tolerance |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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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.
For technical drawings and 3-D models, click on a part number.
Load, lbs. | |||||||||
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OD | Wire Dia. | Extended Lg. @ Max. Load | Min. | Max. | Spring Rate, lbs./in. | Material | Pkg. Qty. | Pkg. | |
9.875" Lg. | |||||||||
0.5" | 0.062" | 10.875" | 4.79 | 6.5 | 1.71 | Music-Wire Steel | 3 | 00000000 | 000000 |
Extension Springs with Hook 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 mm of extension.
For technical drawings and 3-D models, click on a part number.
Load, lbs. | |||||||||
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OD | Wire Dia. | Extended Lg. @ Max. Load | Min. | Max. | Spring Rate, lbs./in. | Material | Pkg. Qty. | Pkg. | |
9.875" Lg. | |||||||||
0.813" | 0.072" | 11.862" | 4.11 | 5.6 | 0.75 | Music-Wire Steel | 1 | 00000000 | 000000 |