It's difficult to determine the correct pre-load and clamp force of a given fastener. For example- when tightened, dry uncoated fasteners use up about 95% of the torque applied to them overcoming the friction between the male and female threads. To ensure that all ARP fasteners provide the optimal level of service, the installed residual stress is calculated and verified experimentally using a superior quality lubricant. It is important to note that the friction coefficients of lubricants vary dramatically, making it difficult to produce the exact amount of stress within the fastener to clamp the components together. That's why ARP developed an ultra consistent lubricant and recommend the use of our premium grade assembly lubricant or thread sealer in order to precisely duplicate the recommended tightening specifications provided with all ARP fasteners. Premium grade moly base with rust and corrosion inhibitors.
Effective lubrication range: -30° F to 750° F.
Load range: 500,000 psi.