302 Stainless Steel Belleville Spring Washers, 1.25 inches Inner Diameter, 2.5 inches Outside Diameter, 0.16 inches Free Height, 0.12 inches Compressed Height, 869.5 foot_pounds Max. Load (Pack of 10) Type 302 Stainless Steel per ASTM 5906 for Thickness 0.072 Type 17-7 PH Stainless Steel per AMS-5528 for Thickness &gt; 0.072 Plain finish Slightly Magnetic (302) or Highly Magnetic (17-7 PH) Set Removed to Maintain Loads Over Time Maximum Operating Temperature of 500 F (260 C) for type 302 and 550 F (290 C) for type 17-7 PH.