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See Chinese contents: GB/T 32.3-2020 GB/T 32.3-2020: Hexagon bolts with wire holes on head -- Fine pitch thread
This part of GB/T 32 specifies the types and dimensions, technical conditions and reference standards, and designation of hexagon bolts with wire holes on head of fine pitch thread. This Part is applicable to hexagon bolts with wire holes on head, of nominal thread diameter of d = 8 mm ~ 48 mm, fine pitch thread, property grades of 5.6, 8.8, 10.9, A2-70, A4-70, A2-50, A4-50, CU2, CU3 and AL4, products grades of A and B.
