square head bolt [机] 方头螺栓 ; 方头螺钉
square-head bolt 方头螺栓
flattened square head bolt 平顶方头螺栓
square-head set-bolt 方头紧定螺栓
Square head bolt-product grade C 方头螺栓 ; C级
black square head bolt 粗制方头螺栓
Mesh column connection with the use of semi-circular bolt head square neck, with anti-theft rings and washers, to prevent the separation can be artificially demolition.
网片与立柱的连接采用半圆头方颈螺栓，配以防盗垫圈，能防止隔离栅被人为地随意拆卸。
方头螺钉的俯视图。
Side view of square head bolt with adjustable thread length.
螺纹长度可调整的平头一字槽螺钉的侧面图。
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