405 P max. Pi 0 F max. L max. (mm) P max. 0 (mm) F max. L min. Load P (N) Max. Allowable Load Load P (N) Max. Allowable Load Initial Tension Free Length L0 Free Length L0 Use within this range. Use within this range. Free Length L0 Free Length L0 L. min. under max. allowable deflection L. min. under max. allowable deflection Spring Length L Spring Length L L min.=L0-Fmax. 2Tension Springs 2Round Coil Springs / Irregular Shaped Coil Springs 2Relationship between Spring Length L and Load P t Tension Springs t Round Coil Springs Load P[N] = Initial Tension Pi[N] + (Spring Constant k[N/mm] x Deflection F[mm]) Load P[N] = (Spring Constant k[N/mm] x Deflection F[mm]) t MISUMI Tension Springs (except for Specified Types) are standardized to maintain the maximum load constantly to the same diameter. Produced based on the maximum load value, the initial tension and spring constant are reference values. t Use the springs within the range of the allowable deflection F max.(mm). Using at higher than the allowable deflection values may cause deformation or failure after a few uses. Also, do not extend tension springs more than its allowable deflection during the installation. & For Tension Springs durability can not be shown because stress concentration may occur depending on the hook installation. It is recommended to use the springs within 70 % of allowable deflection F max.(mm). t It is recommended to use the tension springs (AW , BW , AWFM, WFSP, LWS, LWSH) under ambient temperature (at 40°C or less). Load value attenuates when tension springs are used in temperature higher than 40°C, although it depends on other conditions. t MISUMI Round Coil Springs are standardized to maintain the spring constant constantly to the same diameter. The tolerance of spring constant is ±10%. Irregular shaped coil springs are standardized to maintain the maximum load constantly to the same diameter. The load tolerances vary depending on the spring type, please refer to the respective page. t Use the springs within the range of the allowable deflection F max.(mm). Using at higher than the allowable deflection values may cause deformation or failure. t The values of solid length are for reference only. Using it compressed to the solid length may cause deformation or break after a few uses. t Round Coil Springs are manufactured based on the following diametric tolerance priorities given. I.D. Selectable Type: Inner diameter tolerance prioritized / O.D. Selectable Type: Outer diameter tolerance prioritized. For inner/outer diameter tolerances of irregular shaped coil springs, refer to the respective pages. & It is recommended to use the round coil springs and irregular shaped coil springs under ambient temperature (40˚C or less). Load value attenuates when tension springs are used in temperature higher than 40°C, although it depends on other conditions. (Heat resistant springs are listed on "Standard Components for Plastic Mold".) t Irregular Shaped Coil Springs are listed on "Standard Components for Press Dies" and "Standard Components for Plastic Mold". (Large Dia. Sizes are also available.) Springs Overview
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