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自攻螺丝扭力测试(self-threading screw torque test):
$ R: C. b5 P# H, ~+ N4 k8 `1。测试对象3 X) C! c: B ^; |; {; N
5.10.2 Self-threading screws, including sheet-metal screws, used to secure electrical or enclosure component parts in place or together, shall comply with the self-threading screw torque test in Clause 16.14, when the screw threads into nonferrous metal or polymeric material.* W1 r' F/ X. z7 i
当自螺纹螺丝和铁板牙螺丝用来固定电气或外壳部件在一起时,且这些螺丝是拧入非铁金属或聚合物材料时,这些螺丝就要符合这个测试要求;
- G0 y& }2 r0 F5.10.3 A self-threading or sheet metal screw used for mounting or supporting a part that weighs more than 3.4 kg (7.5 lb) per screw shall comply with the self-threading screw torque test in Clause 16.14., I9 r+ z: e' O: ~* V1 U; J
当自螺纹螺丝或铁板牙螺丝用来安装或支撑重量超过每个螺丝3.4kg时,这些螺丝就要符合这个测试要求;1 M) F: a0 `! r B
2.测试的方法。* g3 _4 t, d5 C0 a8 D
16.14.1 Self-threading or sheet metal screws may be used if threads are not stripped when the screw is tightened with a torque of 3.39 N·m (30 lb·in) and if the part or the assembly supported by the screw withstands for 1 min a force equal to four times the mass of the part or assembly, applied in a direction coincident with the axis of the screw./ N) p$ {* |* z! _7 e5 q4 I
测试方法: 用3.39N.m(30lb.in)的扭力扭紧螺丝, 并在装配表面的螺丝轴向施加于四倍于装配物重量, 螺蚊应不受破坏。 |
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