1,OEM 2,Raw material: 40Cr. 35K 45# 3,certificate: ... or cut threads. Also furnished with medium carbon heavy square nuts either in free fit or wrench fit threads.Available ... Nuture, black, pot galvanizing, cold galvanizing, oil, parkerising etc.2. Grade: 5.6, 8.8, 10.6 and12.93. ... to M364. Length: unrestricted5. Standards for railway products: T B, UIC , AREA, etc. standard components:GB,DIN,ASTM.BS ...