Q series standard core barrels specifications: 
Features: QA&QB series products have good performance in accuracy and mechanism. Their structures match with international standard in application of less than 1000-meter drilling. Wireline rods are made of strong and ductile geological steel pipes which are entire-length thermal processed. Thread of drill rod is strengthened. 
RQ series products are designed on basis of QB series. Thread of drill rod select negative angle to ensure tight connection and prevent drop-out. Compared to QB series, tightness of connection of RQ series is improved. Its structure is same as QB. 
Q-T series is designed for deep drill application of no more than 1500 meters. Wireline rods are made of strong and ductile geological steel pipes which are entire-length thermal processed with its both ends upsized. Thread of drill rod is strengthened.
Q-S series is designed for extra deep drill application of no more than 2500 meters. Wireline rods are made of strong and ductile geological steel pipes which are entire-length thermal processed with its both ends upsized. Thread of drill rod is strengthened