GB/T 67-2008 Slotted pan head screws.Product grade A
GB/T 2423.50-2012/IEC 60068-2-67-1995 Environmental testing part 2: test method test Cy: constant damp heat is mainly used for accelerated testing of components
GB/T 2423.50-2012/IEC 60068-2-67:1995 Environmental testing part 2: test method test Cy: constant damp heat is mainly used for accelerated testing of components