Igwe anaghị agba nchara (countersunk / flat head) rivet nuts;Countersunk isi / ewepụghị isi sere ntu;Hexagon nut / bolt) - gịnị bụ nọmba ọkọlọtọ mba?

Countersunk isi hexagon oghere: GB70.3 DIN7991

Ntu sere okirikiri isi mepere emepe: GB12618

Akụ hexagon: GB6170 DIN934

Mpụga hexagon zuru eriri eriri: GB5783 DIN933

Mkpụrụ rivet: GB17880.1