订购链接：M4*20绝缘透明塑料自攻螺丝

尼小龙塑料自攻螺丝（螺丝本身是塑料）

螺丝本体全部为塑料材质，拧入基材时依靠螺纹挤压，削自行生成内螺纹，不需要预埋螺母；核心特点：绝缘、永不生锈、耐腐蚀，但强度低，只适合轻载固定。

Nxlon plastic self-tapping screw (the screw itself is plastic)

The screw body is made entirely of plastic. When screwed into the base material, its threads cut and deform the material to form an internal thread, eliminating the need for pre-embedded nuts.

Key features: electrically insulating, rust-proof permanently, and corrosion-resistant. However, it has low mechanical strength and is only suitable for light-load fastening.