2021FprEN 6101-2021 Aerospace series - Rivet, 100° medium flush head, close tolerance - Inch series
2018PREN 6101-2018 Aerospace series - Rivet@ 100° medium flush head@ close tolerance - Inch series
FprEN 6101-2021 Aerospace series - Rivet, 100° medium flush head, close tolerance - Inch series was changed to PREN 6101-2018 Aerospace series - Rivet@ 100° medium flush head@ close tolerance - Inch series.