钻具接头扣型尺寸

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" DP2A11×2A10NC31(2-7/8" IF) 2-7/8" DP211×210NC38(3-1/2" IF) 3-1/2" DP311×310102NC46(4" IF) 4A11×4A10NC50(4-1/2" IF) 5" DP411×4102-7/8"FH221×22088953-1/2"FH321×3204-1/2"FH421×4205-1/2"FH7"DC521×5201481276-5/8"FH621×6201272-3/8"REG3-3/4" BIT2A31×2A302-7/8"REG231×23054 3-1/2"REG6-1/8" BIT331×3304-1/2"REG8-1/2" BIT431×4301085-1/2"REG531×5306-5/8"REG12-1/4"BIT/8"DC631×6301311271547-5/8"REG17-1/2"BIT731×7308-5/8"REG831×8302021- 内平 IF ，2- 贯眼 FH，3- 正规 REG。