3820-00-271-1939 (JACKBIT)
NSN 3820-00-271-1939 (NIIN 00-271-1939) is a rock drill bit in Federal Supply Class 3820, Mining, Rock Drilling, Earth Boring, And Related Equipment — a detachable, end cutting drilling tool with an internal thread or tapered socket at one end for attaching a rock drill rod. Manufacturer part number JACKBIT (Ingersoll Rand Co, CAGE 30760); also referenced as 2 (Siemens Energy, Inc.); MS39125 (Military Standards).
NIIN assigned January 1961; DEMIL A (none required); export Schedule B 8430.49.8050. Supersedes 3820-00-634-9197 (1963).