Breakout torque is the force required to loosen a securely tightened—and corroded—nut or bolt. If threads are sufficiently corroded, that torque might be two or three times the tightening torque.
Breakout torque is important because service costs in the Oil & Gas industry can rise when equipment and hardware seize up from excessive corrosion. Servicing engineers often have to use a torch to loosen or remove nuts. When coated with Teflon™, those same nuts and bolts can maintain consistently low breakout torque for many years, or even decades.
What is Lubricity?
Lubricity refers to the functionality of a smooth, dry surface. Teflon is said to have lubricity because it provides low friction resistance with a dry coating. Lubricity is a function—or characteristic—of a surface’s low coefficient of friction. Friction is the force that hinders motion when two objects rub together. The coefficient of friction with Teflon coatings is generally in the range of 0.05 to 0.20, depending on the load, sliding speed, and type of Teflon.
Lubricity is very important in any application that has moving parts touching each other and reapplying oil or grease is not easy. For example, in the automotive and aerospace industries, springs, clamps, and clips are coated with Teflon coatings to avoid wearing down the part and to reduce squeaking.
Generally speaking, Teflon PTFE coatings have the lowest coefficient of friction—or highest lubricity. For fasteners, lubricity means that the surface retains a certain release capability, even at high torque under harsh conditions. Many industries look for long-term fastener protection while having uniform lubricity and breakout torque release that also lasts a long time.
Other Benefits of PTFE Systems
Teflon PTFE coating systems are versatile coatings for carbon steel, stainless steel, and aluminum. There are thin and thick film build options, and the strictly water-based formula allows for easy clean-up.
Color-coding of fasteners is also important in utilities such as waterworks to identify the function of the pipe, for instance, that requires servicing. Teflon ideal for fasteners is available in blue, red, yellow, and black in the PTFE 857G product line.