|
Maximum Allowable Torsional Stress for Helical Compression Springs in Static Applications (% of Tensile Strength) |
|
Material |
Unprestressed
(Before set removed)
(Includes KW or KB) |
Prestressed
(After set removed)
(Includes KS) |
|
Music wire and cold-drawn carbon steel |
45 % |
60-70 % |
|
Hardened and tempered carbon and low-alloy steel |
50 % |
65-75 % |
|
Austenitic stainless steels |
35 % |
55-65 % |
|
Nonferrous alloys |
35 % |
55-65 % |
|
Source : From Shigley's Mechanical Engineering Design [Ref 2] page 508 and
Standard Handbook of Machine Design [Ref-3] Chapter 24 page 19 |