M10及以下的螺丝采用不锈钢螺丝。
整机外壳采用不锈钢盖型螺母，更有效保护螺丝长时间户外及化工的恶略环境不受损伤，使拆卸维护更加方便。
The stainless steel cap nuts on shell of the hoist protect the screw from various injuries of exposed outdoor for long time and severe chemical environment.
整机外壳采用不锈钢盖型螺母，更有效保护螺丝长时间户外及化工的恶略环境不受损伤，使拆卸维护更加方便。
The stainless steel cap nuts on shell of the hoist protect the screw from various injuries of exposed outdoor for long time and severe chemical environment.
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