track bolt&nut 1,Material: 40 CR 2,Grade: 8.8,10.9,12.9 3,Sizes from M6-M42 4,model no.:16*45 Track bolt,track bolts,track bolts with nuts for excavators and bulldozers.We can produce track bolts with nuts according to our customer's supplied samples, designs or technical drawings. here are some pictures for your reference: