A power line insulating assembly and safety arm pin includes: an insulating section, where said insulating section includes an end portion where a fight hand threaded section is provided at the end portion for securing the insulator section to the power linen hardware, wherein the insulating section abuts an arm nut and shoulder assembly; and a safety arm pin connected to the insulating section via the nut and shoulder assembly, where arm pin includes a left handed threaded section to receive hardware for mounting the assembly on a power line transmission assembly, where said hardware is removable without loosening of the insulating section. The hardware for mounting may include a square washer, a left-handed nut and left-handed lock.