Crossover And Subs

Vigor Drilling supply the X-Over Pin (Male) x Box (Female), Pin( Male) x Pin (Male) and Box (Female) x Box(Female) for Drilling string crossover sub.
China Vigor's Crossover Sub (X-Over) is used for crossing over from the size of a single connection to the another. Also used for prolonging the connection life of a more expensive drilling component.
Drilling String Crossover Sub are available with:
Box x Pin
Box x Box or
Pin x Pin Connections
Crossover Sub is manufactured from 4145H. The connections are protected by a phosphate surface coating that reducing the galling when the initial make-up takes place. Sub is manufactured according to API 7-1 Specification.
In addition,China Vigor also supplies variety of rotary sub:
Straight Sub
Straight Sub is used to connect drilling string components that have a similar outside diameter.
Reduced Sub
Reduced Sub is used to connect drilling string components that have different diameters that warrant the cross-sectional change necessary to accommodate different connections. This sub would be used to crossover large OD drilling tools or a tapered drill collar string.
Saver Sub
Saver Sub is used to extend the life of the kelly by taking the connection wear each time it is made up to a drill stem component.