PTFE Coated Bolt /TEFLON coated bolt Torque Chart XYLAN COATED BOLTS, STUD BOLTS & NUTS What is Xylan Coated Stud Bolts, U bolts, bolts & Nuts? Xylan is a fluoropolymer topcoat, which in the 1014 and 1070 coatings afford high lubricity (co-efficient of friction as low as .02), ...