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UL 1598 5.10.2 Self-threading screws, including sheet-metal screws, used to secure electrical or enclosure) H0 t* r* P$ ^
component parts in place or together, shall comply with the self-threading screw torque test in Clause$ U3 p! [& v4 c' G& o3 t
16.14, when the screw threads into nonferrous metal or polymeric material.7 F& k a% Q$ W% Y5 L$ z5 S. i
) h6 s/ \6 Y1 C2 y这里讲了when the screw threads into nonferrous metal or polymeric material.,要做self-threading screw torque test : V. H8 O3 S$ F+ g9 `* r
如果旋入的是其他材料 比如陶瓷呢?: k1 r& z3 ^5 d1 V. X r
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