Our
Drill
collars
for standard use are made of 4145H chromium molybdenum
alloy steel. Residual elements such as sulfur and phosphorus
are reduced during the steelmaking process that make the
kind of material with high physical properties.
The
Drill
collars are available in lengths from 10 to
31 feet and outside diameter from 3-1/8" to 11".
Common sizes and other relevant and important sizes are
listed below.