standard:ISO,DIN,BS,AS,ASTM,ANSI，JIS

Spec.: M16-M30 & 1/2"-1 1/2"

class:10.9S

use:they are used in bridge of rail way or highway boiler steel structure, industrial workshop high storied building tower mast structure, lift machine and other steel structure.we can produce them by ISO, GB/T, DIN, BS, JIS, ASI. The surface treatment
and the packet can by the customer's requirement.