Countersunk head rivet nuts (nke a makwaara dị ka flat head rivet nuts) bụ n'ime eriri eriri e mere kpọmkwem maka metal mpempe akwụkwọ. Nwụnye dị ngwa ma dị mfe, na-achọ naanị egbe rivet. Ọrụ ahụ gbachiri nkịtị ma rụọ ọrụ nke ọma. Naanị tinye rivet nut n'ime imi nke egbe rivet, tinye njedebe nke rivet nut n'ime oghere ígwè mpempe akwụkwọ, ma mee ka egbe ahụ sie ike iji mechaa riveting.
Enwere ọtụtụ ụdị mkpụrụ osisi rivet isi dị larịị, gụnyere mkpụrụ osisi cylindrical rivet dị larịị nke a na-ejikarị eme ihe, mkpụrụ osisi rivet isi hexagonal dị larịị, na mkpụrụ rivet isi dị larịị. Nhọrọ ndị ọzọ na-agụnye mkpụrụ osisi mịrị amị, countersunk hexagonal rivet nuts, obere countersunk head rivet nuts, na countersunk imperial rivet nuts.
A na-ekewa mkpụrụ rivet n'ime na mpụta hexagonal rivet nuts, ọkara-hexagonal rivet nuts, countersunk head rivet nuts, small countersunk head rivet nuts, flat head rivet nuts, blind hole rivet nuts, and elevator{1}kpọmkwem mkpụrụ rivet. A na-eji carbon ígwè na igwe anaghị agba nchara mee ha.
Ụdị rivet a na-adabara maka ihe ndị na-emepụta aluminum alloy nke dị iche iche dị iche iche na efere ígwè nwere ọkpụrụkpụ sitere na 1 ruo 2.5 mm. Iji nchara rivet nuts na aluminum alloy components bụ ihe kwesịrị ịrịba ama nke ọma, na-eme ka usoro dị egwu dị mfe nke efere ígwè tupu - agbakwunyere ma na-emeziwanye ike nke ọma.