Specifies dimensional material and marking requirements for single nut and double nut hot-dip galvanized steel bolts with associated nuts and washers for tower construction with ISO metric coarse pitch series threads in diameters from 12 mm to 30 mm inclusive and lengths up to 160 mm for single nut bolts, 125 mm for double nut bolts and from 180 mm to 270 mm for step bolts. Clamping lengths are tabulated in an appendix and equations for the determination of the clamping lengths are given.
