black oxide carbon steel

English to Italian Tech/Engineering Rigid Couplings

"Rigid couplings are offered in one- or two-piece styles in aluminum, *black oxide carbon steel*, and stainless steel with bore sizes from 1/8““ to 2“ in the inch series and 3 mm to 50 mm in the metric series."

Mi sta dando del filo da torcere questo "black oxide" in combinazione con l'acciaio al carbonio.

Mille grazie in anticipo per ogni prezioso suggerimento.

Ciao
Francesco