钻具接头扣型尺寸.doc

.接头扣型尺寸接头数字或尺寸对应钻具及钻头国内编码公端根径(mm)公端小径(mm)公扣长度(mm)母扣内径(mm)母扣长度(mm)NC26(2-3/8 IF) 2-3/8 DP2A112A1073.160.476.274.679.4NC31(2-7/8 IF) 2-7/8 DP21121086.171.388.987.792.1NC38(3-1/2 IF) 3-1/2 DP31131010285.1101.6103.6104.8NC46(4 IF) 4A114A10122.8103.7114.3124.6117.5NC50(4-1/2 IF) 5 DP411410133.4114.3114.3134.9117.52-7/8FH22122092.170.18894.5953-1/2FH321320101.47