SBAC TS 135 Issue 2 (2004) Technical Specification For Self Locking Nuts (mj Threads) Reduced Hexagon, Deep Counterbored Tensile Strength: 1100 Mpa At Ambient Temperature Covers the technical, qualification and quality assurance requirements for self locking, deep counterbored nuts in material BS HR650(A 286) or EN 2399/EN 3639 of tensile class 1100 MPa at room tempera