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Step 2:
Tighten receptacle onto the panel with M4 bolts (recommended torque is 0.8~1.0 N.m)
1:
Recommended M4 bolts refer to GB/T 70.L-2000 ( eqv ISO 4762:7997)
2:
Recommended M4 spring lock washer refer to GB 93-87
3:
Recommended M4 plain washer refer to GB 97.1-2002