SBAC TS 26 Issue 3 (2004) Technical Specification For All Metal Self-locking Nuts (unj Threads) 1210 Mpa (175,000 Lbf/in[2]) Minimum Tensile Strength At Ambient Temperature Gives the requirements for all metal self-locking nuts, plate nuts and shank nuts made of a corrosion and heat resistant nickel alloy which will develop a minimum tensile strength of 1210 MPa (175,000