Compression Spring, Stainless Steel, Metric, 4.5 mm OD, 0.5 mm Wire Size, 7.11 mm Compressed Length, 15 mm Free Length, 7.78 N Load Capacity, 0.97 N/mm Spring Rate (Pack of 10) Stainless steel 301, 302 or 304 wire offers good mechanical properties with greater corrosion and heat resistance than music wire Spring ends are closed (squared), but not ground for efficient force transfer and reduced possibility of tangling Load capacity of 7.78 newtons Maximum operating temperature of 500 degrees F (260 degrees C) All dimensions and forces meet DIN 2095 (Grade 2)