Junk Subs

Junk Subs
Junk Subs
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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

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