High Carbon Steel Belleville Spring Washers, 0.38 inches Inner Diameter, 0.75 inches Outside Diameter, 0.051 inches Free Height, 0.039 inches Compressed Height, 110 foot_pounds Max. Load (Pack of 10) High Carbon Steel Spring Commercial 1074, Certified to ASTM-A684 Dry to the Touch Oil Finish Highly Magnetic Set Removed to Maintain Loads Over Time Maximum Operating Temperature of 350 degrees F (180 degrees C) Ideal for Non-corrosive Environment Applications