止挡件通过在质量体角部的上方延伸连接件层而形成，或者通过保留半导体层而形成。
Stopper is formed by extending the connector layer, or leaving the semiconductor layer, above the mass body corners.
尼龙锁紧母、金属锁紧母、K帽、六角螺母、盖帽形、蝶形帽及各式垫圈、挡圈、销类等。
The mother of nylon lock, metal lock master, K cap, hex nut, cap-shaped, butterfly hats and all kinds of washers, retaining rings, pins and so on.
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