Product Description

· Brand Name:MTWK

· Place of Origin:China

· Model Number :MTWK*1

· Grade :***5H

· Length :***0 or ***0mm

· Outer Diameter :3 1/8"**4"

· Specification :VARIOUS

· Technique :Seamless

· Usage :well drilling

The spiral drill collars are made of ***5HMOD modified chromium-molybdenum alloy steel according to API Spec 7*1 . All threads can be phosphated,copperised or cold worked. All threads are machined with CNC Lathes-Double-Shouldered and a special thread, the max diameter of spiral drill collar is *4 inch.

Out diamete: 3 7/8"~ *4"(inch)

Depth of cut: 4.0 ~ *1.9 (mm)

Length: ***0***0(mm)

Standard size for drill collar