semifinished countersunk head bolt

例句：

1. 1.The carpenter used a semifinished countersunk head bolt to secure the wooden beam.
   木匠使用一个半成品的沉头螺栓来固定木梁。
2. 2.The construction company used this type of bolt for its prefabricated housing units.
   建筑公司使用这种螺栓用于其预制房屋单元。
3. 3.The engineer tested the bolt's strength and found it to be within acceptable limits.
   工程师测试了螺栓的强度，发现它符合可接受的极限。