... 662--- Mushroom head rivet; 5. DIN 674--- Flat round head rivet; 6. DIN 675 ---Flat countersunk head rivet (Belt rivet) . Any specifications ... roofing bolts.Nuts: spring nuts, T nuts, K nuts, rivet nuts, cage nuts, lock nuts, hex nuts, hex flange nuts ... set screws, hex socket head cap screws, wood screws.Rivet: solid rivet, blind rivet, pop rivet.Nails: roofing nails, twist nails, double head nails. ...