high tension bolt 1.Standard:DIN931/933 DIN912, ASTM,JIS,BS, 2.Size: ... third partyApplication chemical industry, petroleum industry, construction industry, domestic installation, and so onDelivery Timeusually within 25-30 days after we have ... specializing in all kinds of Pipeline Materials to oil field and refinery as Steel Pipes, Pipe Fittings, Flange, Valves, Gasket, Petroleum ...