BS1139 igipimo cyibyuma, ni kirekire, bikoreshwa cyane kandi bisanzwe kwisi yose.Urwego rwibikoresho S235GT rurerure rwasizwe umuyoboro wibyuma hamwe na diametre yinyuma ya 48.3mm, kandi birashyushye cyane imbere no hanze.Ukurikije uburyo bwo gupima BS EN ISO, hasesenguwe imiterere yimiti ya karubone (C), silikoni (Si), fosifore (P), sulfure (S), azote (N) nibindi bikoresho birasesengurwa.Imiterere yumubiri nubukanishi bwimiyoboro yicyuma igeragezwa nk: imbaraga zingana, umusaruro no kuramba.Gukoresha imiyoboro y'ibyuma byujuje ubuziranenge bwa BS1139 ni amahitamo meza ashobora kugabanya neza amahirwe yimpanuka ziterwa nibibazo byubuziranenge.