tapped

double pin sucker rod

两头阳螺纹的抽油杆

pin-to-pin reducer

两头阳螺纹的大小头

pepe bend with male and female thread

一头带阳螺纹一头带阴螺纹的弯头

pipe bend with female thread

两头带阴螺纹的弯头

male and female cross

阳螺纹-阴螺纹十字接头

Threads on rotary shouldered connections for petroleum industry

GB/T9253.1-1999石油钻杆接头螺纹

Petroleum equipment--Thread gages for rotary shouldered connections

GB/T4749-1993石油钻杆接头螺纹量规

mule-head hanger

驴头上挂抽油杆的装置

A pipe coupling threaded on both ends.

螺纹接头一种两端都带外螺纹的管子

a fastener with a tapered threaded shank and a slotted head.

由带螺纹的连杆和槽头组成的扣件。

Finite element analysis of the screw structure of the drill-stem junction

钻杆接头螺纹结构形式的有限元分析

Study on Rules of Fluid Flow in the Well Bore of the Screw Pump with the Ground-driven

地面驱动螺杆泵抽油杆旋转效应的研究

A study of the surface crack at thread root of tool joint pins by the aid of finite element method.

石油钻杆公接头螺纹牙根部表面裂纹有限元计算

box up and pin down

上部阴螺纹-下部阳螺纹接头

Research on Surface Cracks and Reliability of Residual Life in Sucker Rods;

抽油杆表面裂纹及剩余寿命的可靠性研究

female-male reducer

两端分别带有内外螺纹的大小头

A Dynamics Study on Surface-driving Progressing Cavity Pump of Oil Production System;

地面驱动螺杆泵井抽油杆柱力学研究

Development and Application of PCP Special Pumping Rod with Middle Displacement;

中排量螺杆泵专用抽油杆研制与应用