China Rock drilling - Rota GB Standards Search Result

and Chinese version GB Standards, you can purchase directly in the web page; After receive your payment, we will send the GB Standards PDF file to your Email within 1~3 days.
2. Other English version GB Standards are not ready translated, only after get your order, then we translate them, time usually need 3-5 days .


	GB/T 20704-2006 Rock drilling - Rotary drill-rods and rotary drill-bits for dry drilling - Connecting dimensions 岩石钻孔干式钻杆和钻头连接尺寸 - 英文版

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