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See Chinese contents: GB/T 820-2015 GB/T 820-2015: Raised countersunk head screws with cross recess
This standard specifies the type and size, technical condition and marking of the raised countersunk head screws with cross recess. This standard applies to the type H and type Z raised countersunk head screws with cross recess of the thread specification M1.6 ~ M10, the performance level of 4.8, A2-50, A2-70, CU2, CU3 and AL4, AND the product grade A.
