Lab Hear treated and electro galvanized bolt with oval neck and heavy duty hexagon nuts.
Track head meet to the physical and chemical requirements od ASTM A 449 and physical requirement
china grooved pipe fittings
1) Automatic sprinkler system for fire protection on commercial, civil and municipal constructions like water supplying, gas supplying, heat supplying, etc.
2) Industrial pipeline system on shipping,mine,textile oil field,powder plant, etc.
3) Pipeline system on subway station, railway station airport, seaport, bridge, etc