Note: the external insulation diameter of the monitoring cores should correspond to that of the dynamic core.
注：监视线芯绝缘外径应与动力线芯绝缘外径相当。The kelly bushing (KB) has an inside diameter profile that matches that of the kelly, usually square or hexagonal.
方钻杆补心的内径通常与方钻杆的外径（通常是四方钻杆或六方钻杆）相匹配。The centre of this wooden disc was hollowed out to a diameter equal to the exterior diameter of the columbia d.
这木盘中间留着一个直径相当于哥伦比亚炮外径的圆洞。A device that can be run into a wellbore with a smaller initial outside diameter that then expands externally to seal the wellbore.
一种可以下入井眼内的装置，刚下入井眼时外径较小，之后外部膨胀去密封井眼。A metal ball can be absorbed by the magnet when the ball falls down. Its external diameter is larger than the diameter of the control mouth.
及一金属圆球，可脱落地受该磁铁磁性吸附，其外径系大于管制口的口径。The outside micrometers are widely used for outside precision measurement and the main inaccuracies conform to ISO and GB standards.
外径千分尺广泛应用于外尺寸的精密测量，主要精度符合国际标准和国家标准。Note: The front two numbers indicate the inner diameter of the pipe, and the back two indicate the outer diameter.
说明：前两位数表示管子内径，后两位数表示管子外径。This outside micrometer is widely used for outside precision measurement. ? Measuring face trimmed with carbide.
外径千分尺广泛应用于外尺寸的精密测量。？测量面镶硬质合金。The bending radius of a cable should not be less than 10 times of the cable diameter.
电缆弯曲半径不小于电缆外径10倍。