We can supply two types of track bolts, button head oval neck and button head elliptical neck. Both types are manufactured to A.R.E..A. and A.S.T.M., and A-183 specifications. Bolts are furnished with rolled or cut threads. Also furnished with medium carbon heavy square nuts either in free fit or wrench fit threads. Available in 3/ 8 inch to 1-1/ 2 inch or others on request .