based only) brass aluminum brass condenser tubes brass pipe brass pipes brass shell cases with primers brass shell cases without primers brass small arms and rifle shells hard brass solids red brass scrap brass items yellow brass scrap construction construction materials plywood soil stone timber copper...
based only) brass aluminum brass condenser tubes brass pipe brass pipes brass shell cases with primers brass shell cases without primers brass small arms and rifle shells hard brass solids red brass scrap brass items yellow brass scrap construction construction materials plywood soil stone timber copper...
based only) brass aluminum brass condenser tubes brass pipe brass pipes brass shell cases with primers brass shell cases without primers brass small arms and rifle shells hard brass solids red brass scrap brass items yellow brass scrap construction construction materials plywood soil stone timber copper...
based only) brass aluminum brass condenser tubes brass pipe brass pipes brass shell cases with primers brass shell cases without primers brass small arms and rifle shells hard brass solids red brass scrap brass items yellow brass scrap construction construction materials plywood soil stone timber copper...
based only) brass aluminum brass condenser tubes brass pipe brass pipes brass shell cases with primers brass shell cases without primers brass small arms and rifle shells hard brass solids red brass scrap brass items yellow brass scrap construction construction materials plywood soil stone timber copper...
based only) brass aluminum brass condenser tubes brass pipe brass pipes brass shell cases with primers brass shell cases without primers brass small arms and rifle shells hard brass solids red brass scrap brass items yellow brass scrap construction construction materials plywood soil stone timber copper...
pressure well are also available. technical characteristics drill collar are made of modified alloy steel fully heat treated in order to obtain high hardness. cold rolling processing the thread ends to achieve good pressure-bearing ability, anti wearing out and longer life-span. thread phosphor or copper...
mechanical strength ability with overall good performance. the thread is cut by the special-purpose numerical control lathe which keeps the rod body still when cutting the threads. the special process could ensure the high precision of the thread with better reliability and life-span. coupling phosphor or copper...