bit sub

bit sub

[′bit ‚səb]
(petroleum engineering)
A sub designed to be inserted between the drill collar and the bit.
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References in periodicals archive ?
Tenders are invited for For repairing of worn out yoke and worn out bit sub of drill sl.no.
The resustored in the first latch(Q5) of the 4 bit sub shift register #2.
Tenders are invited for 1 Repairing of Dipper handle eye (Both Side) and new bush fitting in M-182, Marion, Shovel.2 Repairing of one no Bit Sub, Pt.no- F2343 of RE750E, Drill, Sl.no- RD-528.3 Repairing of one no Spindle-Sub, of RE750E, Drill.