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BELLEVILLE SPRING WASHERS FOR FASTENER SIZE 1?2? X 13 ? UNRC, TARGET FLAT LOAD 1900-2300 LB., DEFLECTION 0.009 IN., WASHERS SHOULD BE MADE OF HIGH CARBON TOOL OR SPRING STEEL, OR A PRECIPITATION-HARDENED 17 -7PH STAINLESS STEEL, WITH AN ELECTROLESS NICKEL PLATING OF 0.001? (0.025 MM) MINIMUM FOR CORROSION PROTECTION, OR MAY BE MADE FROM INCONEL 718 (NICKEL ALLOY).