... - DIN7504 - N, K, DIN7504 - P series: hex head, flat, round head, huawei head, big flat head drlling screw, these screws or have large inventories! And ... welcome to inquire. Business scope: common thread diameter # 6 (3.5), 7 # (3.9), 8 # (4.2), 10 # (4.8), 12 ... # (5.5), 14 # (6.3) can produce length range: - 13mm 280mm electroplating ...