Emepụtara Boltal 625 na 1960 A na-ama ama 625 bolt, nke a makwaara Niloy 625, amaara ikike ha nwere iji nọgide na-enwe ike na iguzogide gburugburu na gburugburu. Ọnụnọ Nickel na Chromium na-eme ka eriri afọ 625 na-eguzogide ọgwụ mgbochi, oxidation na carburtization. Molyybdenum na-enyere aka inye ike ike ọgwụgwụ ike na iguzogide nchekasị, na-enwe ike na corvice corrosion na-agbada ma ọ bụrụ na ekpughere ya.