Rock Drilling Tools

Rock Drilling Tools

DTH Connection Adapters
  • DTH Connection Adapters
  • DTH Connection Adapters
  • DTH Connection Adapters
  • DTH Connection Adapters
  • DTH Connection Adapters

DTH Connection Adapters / DTH Subs

  • Complete thread range covers all major API-standard threads, including REG and NC series, ensuring broad compatibility with common drilling tools.
  • High-strength material and heat treatment: Manufactured from 42CrMo alloy steel and processed with a proven heat treatment process, delivering high tensile strength, excellent toughness, and superior torque resistance.
  • Comprehensive customization support:
    1. Technical customization: length, thread type, and connection form
    2. Appearance customization: surface color and logo marking
Request a Quote
Downloads
Typical Applications

Open-pit mining, agricultural irrigation wells, bridge and building construction, geological exploration, oil and gas drilling

Open-pit blasting and mining
Open-pit blasting and mining
Water well drilling
Water well drilling
Technical Specifications
Technical Specifications
Thread (pin) Thread (box) Diameter Length Falt Size Flat Width Hammer Type
D, mm L0, mm L1 K
API 2 3/8'' REG API 3 1/2'' REG 114 235 95 45 4'' or 5''
NC26 89 262 70 45
NC31 102 240 83 40
API 3 1/2'' REG API 2 3/8'' REG 108 410 95 51 6''
NC26 118 400 72 45
NC31 114 300 95 51
NC38 127 400 108 51
API 4 1/2'' REG API 2 3/8'' REG 138 460 57 40 8''
API 3 1/2'' REG 138 480 83 51
NC26 138 440 70 45
NC31 138 440 95 51
NC38 138 420 108 51
API 5 1/2'' REG API 4 1/2'' REG 178 312 150 80 10''
NC31 168 460 95 51
NC38 168 480 108 51
API 6 5/8'' REG API 4 1/2'' REG 270 400 220 70 12''
API 5 1/2'' REG 190 330 164 60
NC35 178 467 95 51
NC38 194 550 98 55
NC46 178 350 161 55
NC50 200 350 180 80
API 7 5/8'' REG API 4 1/2'' REG 198 390 124 51 14''
NC31 198 380 95 51
NC50 246 550 127 50
API 8 5/5'' REG API 6 5/8'' REG Custom Custom Custom Custom 18'' or 24''
NC46 Custom Custom
NC50 Custom Custom Custom Custom

The above specifications list Pin x Box thread connections. Other configurations are available, including Pin x Pin, Box x Box, and Box x Pin, subject to customization.