Compression Spring, 302 Stainless Steel, Inch, 0.72" OD, 0.105" Wire Size, 2.84" Compressed Length, 4" Free Length, 48.81 lbs Load Capacity, 42.07 lbs/in Spring Rate (Pack of 10) Stainless steel 302 wire per ASTM A313 or AMS 5688 spring temper Spring ends are closed and ground flat (squared) for efficient force transfer and reduced possibility of tangling Load capacity of 48.81 pounds Maximum operating temperature of 500 degrees F (260 degrees C) Slightly magnetic passivated spring offers better corrosion resistance than music wire springs