Music Spring Wire Tensile Specifications Diameter Tensile Range [PSI] Break Strength/lbs. .004" 439-485,000 5.5-6.1 .005" 426-471,000 8.4-9.2 .006" 415-459,000 11.7-13.0 .007" 407-449,000 15.7-17.3 .008" 399-411,000 20.1-22.2 .009" 393-434,000 25.0-27.6 .010" 387-428,000 30.4-33.6 .011" 382-422,000 ...