... of small, high intensity, over loading capability and not easy to distort, is made of high intensity alloy plank, ... over loading capability, abrade resistent, heat resistant and not easy to distort.8. HJ type bolt is made of alloy ... double safety.American type mechanical suspension:1, 88# for 13T axles 2,86# for 16T axles3, 2-4 axles mechanical suspension American mechanical suspension system