40 used lubricants such as Moly and EPL typically require 5-7 cycles before final torquing to level out the initial friction and achieve the required clamp load. Slicker lubricants may reduce the required torque by as much as 20-30% to achieve the desired clamp load, but compromise in areas of major importance such as repeatability, and may yield the fastener prematurely. Typically, the slicker the lubricant, the greater the clamp load scatter will be during installation. The bottom line: clamp load repeatability and consistency from a fastener to fastener perspective, should be the number one consideration when choosing a fastener assembly lubricant. Remember even the best fastener is only as good as its installation. Clamp load repeatability is the foundation for maintaining round housing bores, and consistency ensures the same clamp load from one fastener to another across a large area, such as the deck surface of a cylinder block. These two fundamentals are the cornerstone of every successful fastener installation and that’s why ARP’s engineering team set out to develop the “ultimate” fastener lubricant. The result of several years of extensive R&D is a remarkable assembly lube called ARP Ultra-Torque®. As shown in the graph above, ARP Ultra-Torque® clearly provides the clamp load repeatability and consistency that no other fastener assembly lubricant on the market today can provide. ARP’s computer-controlled torque-tension machine can apply a given torque or torque-angle to a fastener and measure the clamp load. Through test cycles, it is possible to chart the clamp load scatter with various fasteners and lubricants. Proper Fastener Retention Torque Cycle 19,000 18,000 17,000 16,000 15,000 14,000 13,000 Preload in lbs ARP Ultra-Torque EPL Moly Oil 1 2 3 4 5 6 7 8 9 10 Installation Clamp Load Scatter Comparison (Target Preload 18,000 lbs @ 120 ft-lbs) FASTENER TECH
RkJQdWJsaXNoZXIy OTg4MDk=