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UL 1598 5.10.2 Self-threading screws, including sheet-metal screws, used to secure electrical or enclosure6 n! E; J; G) F6 H( @4 }
component parts in place or together, shall comply with the self-threading screw torque test in Clause
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, v) `! q1 J6 c- k% z! F4 P这里讲了when the screw threads into nonferrous metal or polymeric material.,要做self-threading screw torque test 3 m8 o3 u9 [& h; w
如果旋入的是其他材料 比如陶瓷呢?
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