Standard Handbook of Machine Design P29
TABLE 24.12 Maximum Allowable Stresses for ASTM A228 and Type 302 Stainless-Steel Helical Extension Springs in Cyclic Applications Percent of Tensile Strength "f™ ** of Cycles
10 106 107
5
1
In Torsion Body
36 33 30
I
End
34 30 28
In Bending _ End
51 47 45
This information is based on the following conditions: not shotpee ned, no surging and ambient environment with a low temperature heat treatment applied. Stress ratio = O. SOURCE: Associated Spring, Barnes Group Inc. 24.5.8 Tolerances
Extension springs do not buckle or require guide pins when they are deflected, but they may vibrate laterally if loaded or unloaded suddenly. Clearance should be allowed in...
