Crossover Subs
The Crossover
Sub is used to crossover from one connection size
to another 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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