... .4, Rail brace, welded shoulders and rail anchors.5, Standard fasteners.6, Nuts, flat washers and spring washers, plastic pads, nylon ... , screws, nuts, threaded rod, anchor bolt, nail, other off-standard fasteners and following to the drawers of products, which are ... bolt and nut5-Surface dealing : Black, Grey(phosphated, Parkerising)6- Thread standard : Thread length tolerance according to GB/T 3103.1- ...