An ƙayyade Girman bututu tare da lambobi guda biyu marasa girma:
Girman Bututu mara izini (NPS) don diamita bisa inci.
Lambar Jadawalin (SCH don tantance kaurin bangon bututu.
Duka girman da jadawalin ana buƙatar don tantance takamaiman yanki na bututu daidai.
Girman Bututu mara izini (NPS) shine Saitin daidaitattun masu girma dabam na Arewacin Amurka na yanzu don bututun da ake amfani da su don matsananciyar zafi da ƙarancin zafi.Karin bayani akan wannan yana nan.
Girman bututun ƙarfe (IPS) shine ma'auni a baya fiye da NPS don tsara girman.Girman shine kimanin diamita na cikin bututu a cikin inci.Kowane bututu yana da kauri ɗaya, mai suna (STD) Standard ko (STD.WT.) Standard Weight.Kaurin bango 3 ne kawai a lokacin.A cikin Maris 1927, Ƙungiyar Ƙididdiga ta Amirka ta ƙirƙiri tsarin da ya tsara kauri na bango dangane da ƙananan matakai tsakanin masu girma da kuma gabatar da Girman Bututu na Nominal wanda ya maye gurbin Girman Bututun ƙarfe.
Lambar Jadawalin don kaurin bango ya fito daga SCH 5, 5S, 10, 10S, 20, 30, 40, 40S, 60, 80, 80S, 100, 120, 140, 160, STD, XS (Ƙarfin ƙarfi) DA XXS Karfi).
Bututu da Sharuɗɗan Sha'awa
BPE - Black Plain End bututu
BTC - Baƙar fata & Haɗe
GPE - Ƙarshen Filin Galvanized
GTC – Galvanized Threaded & Couped
TOE - Ƙarshen Zare Daya
Rufin Bututu & Ƙarshe:
Galvanized - An rufe shi da murfin zinc mai karewa akan karfe don hana abu daga tsatsa.Tsarin zai iya zama mai zafi-tsoma-galvanizing inda kayan da aka tsoma a cikin narkakkar zinc ko Electro-Galvanized inda aka yi galvanized takardar karfe da aka yi da bututun yayin samarwa ta hanyar halayen lantarki.
Uncoated - Bututu mara rufi
Baƙar fata - Mai rufi da baƙin ƙarfe-oxide mai launin duhu
Red Primed -Red Oxide Primed da aka yi amfani da shi azaman tushen gashi don karafa na ƙarfe, yana ba da saman ƙarfe da ƙarfe kariya ta kariya.
