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The Crossover Sub is used to crossover from one connection size to another. And/or as the disposable component used to extend the connection life of a more expensive drill stem member.
Crossover subs are available with box x pin, box x box or pin x pin connections.
Crossover Subs are manufactured from 4145M or 4140HT alloy steel. The connections are protected by a phosphate surface coating that minimizes galling on initial make-up.
When ordering, please specify:
Identify sub use. Example: Kelly Sub, crossover drill pipe to drill collar, drill collar to drill collar, bit sub, etc Overall length Largest diameter Bore ID Size and type of upper and lower connections, indicating pin or box Cast or pressed-steel thread protectors For Reduced Section Subs, add: diameter of reduced section Length of reduced section: 8", 12", 18" or 24" For Bit Subs, add: float bore size and type if desired
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