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API 7-1 4145&Non-mag Drill Collar
Drill Collar an ƙera shi ne daga AISI 4145H wanda aka gyara da wuta da ƙarfe mai zafi kuma ana kula da zafi tare da tsayinsa duka don ƙaƙƙarfan iri ɗaya da dorewa. Ana yin gwaje-gwajen ƙarfe mai ƙaƙƙarfan ƙayyadaddun ƙayyadaddun bayanai don tabbatar da cewa maganin zafi yana samar da daidaito da matsakaicin ƙarfi ta zurfin mashaya.
Landrill yana ba da ƙwanƙolin rawar soja a ma'auni kuma ya karkata daga 3-1/8 "OD har zuwa 14" OD daidai da ƙayyadaddun API, NS-1 ko DS-1.
Dakin 703 Ginin B, Cibiyar Greenland, yankin bunkasa fasahar Hi-tech Xi'an, China
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