Swivel Sub 3 1/2" FH x 4 1/2" IF API7-1 SPEC



Swivel Sub 31/2" FH x 41/2" IF API7-1 SPEC

A sub is a special short length of threaded pipe used to connect drill pipes to drill collars, with a drill pipe connection on one end and a drill collar connection on the other.

There is a wide range of subs available, including:
Swivel Sub

Straight (slick) Crossover Sub 
Bottleneck (reduced section) Sub 
Crossover Sub with Float Bore 
Bit Sub with Float Bore 
Bit Sub without Float Bore 
Top Drive Saver Sub 
Kelly Saver Sub 
Kelly Saver Sub with a stretched on rubber protector 
Lift Sub (18 deg taper) 
Lift Plug 

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