半精螺栓 semi finished bolt

微小精密螺丝 MICRO SCREWS

螺纹精度 [机] Accuracy of thread ; tolerance quality

精制螺栓 finished bolt ; turned bolt ; [机] bright bolt

精制螺帽 bright nut ; finished nut

精密螺纹 accurate thread

精密螺钉 precision screw

精密螺纹机 precision thread-peeling machine

精密螺栓 Precision Bolt