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自攻螺丝扭力测试(self-threading screw torque test):$ F- h/ o" P) I; v2 \5 S
1。测试对象6 b5 T+ y+ P8 p0 P! \# V
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.
/ d2 h4 k! N) I. Y3 S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;
3 b/ |: ` s& P7 e/ e: `, r7 A$ _& V5.10.3 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.
" z) p% N% y4 E7 q9 D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;
' {; E# I' Y a4 |) q2 A2.测试的方法。6 a2 N t/ L4 k. Q
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.
3 B0 j. j( G$ [! m- N3 o& [0 z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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