Calculate the spring constant from the dimensions of a compression coil spring
Author: kuni3075Executions: 16882
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| Spring constant | N/mm |
The calculation formula and transverse elastic modulus are cited from the Tokai Spring Industry Co., Ltd. website.
*Update: October 4, 2025
The calculation for the average coil diameter contained an error and has been corrected.
*Update: October 4, 2025
The calculation for the average coil diameter contained an error and has been corrected.
No customer feedback for this calculation yet.
The default values are based on the spring information shown in the attached image.
*For the number of effective coils, please count the number of coils while looking at the photo and enter that number.
◆List of Transverse Elastic Moduli
Spring steel, hard steel wire, piano wire, oil-tempered wire 78,500
Stainless steel (SUS304) 68,500
Stainless steel (SUS316) 73,500
Stainless Steel (SUS631J1) 73,500
Brass Wire 39,000
Nickel Silver Wire 39,000
Phosphor Bronze Wire 42,000
Beryllium Copper Wire 44,000