WJ-7 fastener

WJ-7 fastener is a kind of separate shoulder-free fastener used in ballastless track of high-speed railway in China. It is composed of T-bolt, nut, flat washer, spring bar, insulating gauge block, iron cushion plate, underrail cushion plate, insulating buffer plate, heavy spring washer, flat washer block, anchoring bolt and embedded sleeve, etc. In order to adjust the rail height, It also includes a rail lower high backing plate and an iron lower high backing plate.