Machinery's Handbook, 31st Edition
Stresses in Springs
313
260 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110
Oil-tempered MB Grade, ASTM A229 Type I
Light service
Average service
Severe service
Wire Diameter (inch)
Fig. 8. Recommended Design Stresses in Bending for Helical Torsion Springs— Oil-Tempered MB Round Wire
220 210 200 190 180 170 160 150 140 130 120 110 100
Stainless Steel, “18-8,” Types 302 & 304, ASTM A313
Light Service
Average Service
Severe Service
90 80 70
Wire Diameter (inch)
Fig. 9. Recommended Design Stresses in Bending for Helical Torsion Springs— Stainless Steel Round Wire
290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 140
Chrome-silicon, ASTM A401
Light service
Average service
Severe service
Wire Diameter (inch)
Fig. 10. Recommended Design Stresses in Bending for Helical Torsion Springs— Chrome-Silicon Round Wire
a Although Fig. 1 through Fig. 6 are for compression springs, they may also be used for extension springs; for extension springs, reduce the values obtained from the curves by 10 to 15 percent.
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