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See Chinese contents: GB/T 70.6-2020 GB/T 70.6-2020: Hexagon socket head cap screws -- Fine pitch thread
This Part of GB/T 70 specifies the types and dimensions, technical conditions and designation of hexagon socket head cap screws with fine pitch thread. This Part is applicable to hexagon socket head cap screws with the nominal diameter of thread d = 8 mm ~ 36 mm, fine pitch thread, performance level of 8.8, 10.9, 12.9/12.9, A2-50, A2-70, A3-50, A3-70, A4-50, A4-70, A5-50, A5-70, CU2 and CU3, and Grade-A of product grade.
