What's Camper Halfes? Where Should I NOT Use A2-70 Stainless Steel Bolts ? A2-70 Should Not Be Used In Heavily Loaded Mechanical Or Structural Areas. Areas Of Direct Loading On The Suspension. Areas Of Direct Loading On The Steering Column And Linkages. Active Engine Componets (Con-Rods, Crank Shaft, Clutch, Transmission & Power Off-Takes) Active Gearbox And Power-Train Components. Any Nut Or Bolt Stamped With A 10:9 Or 12:9 Should Be Replaced With An Identically Rated (Or Higher) Component AND NOT An A2-70 Component.