Junk Subs

: http://geotecdrill.com/4-drilling-parts/4-drilling-subs-7.html

The junk sub is used applied during the drilling process for fishing fallen objects such as carbide teeth, drill bits and bearings which cannot be carried out of the downhole by conventional drilling fluid circulation and other fishing operations. The junk sub helps extend bit service life by reducing and preventing drill bit damage. The subs are available in multiple sizes.

Specifications

Type	Hole size (mm)	Thread Conn.	I.D (mm)	O.D. (mm)
LB94	108 ~ 117.5	2 3/8 REG	19	94
LB102	117.5 ~ 124	2 7/8 REG	32	102
LB114	130 ~ 149	3 1/2 REG	38	114
LB127	152.4 ~ 162	3 1/2 REG	38	127
LB140	165 ~ 190.5	3 1/2 REG	38	140
LB168	190.5 ~ 216	4 1/2 REG	57	168
LB178	219 ~ 244.5	4 1/2 REG	57	178
LB190	229 ~ 273	4 1/2 REG	57	190
LB197	235 ~ 279.5	4 1/2 IF	70	197
LB219	244 ~ 295	6 5/8 REG	76	219
LB229	254 ~ 305	6 5/8 REG	76	229
LB245	292 ~ 330	6 5/8 REG	76	245
LB280	330 ~ 375	7 5/8 REG	76	280
LB311	327 ~ 375	7 5/8 REG	76	311
LB327	375 ~ 444.5	7 5/8 REG	76	327
LB340	386 ~ 456	7 5/8 REG	76	340