we are capable of producing various types of tunnel bolt, including curved tunnel bolt , spear bolt ,customized bolts are also available according to your drawings or samples ...
the tunnel bolts are divided into circumferential and longitudinal.
we are capable of producing various types of tunnel bolt, including curved tunnel bolt , spear bolt ,customized bolts are also available according to your drawings or samples ...
ø standards: gb, arema, iso, uic,as,bs etc
ø grade:8.8, 10.9
ø material: carbon steel, stainless steel
ø surface: plain ,hdg ,black or as customer requirement