The Largest Russian Manufacturer of Rock Bits
790 Style
The 790 style of Three Cone Rock bits is designed for a multitude of drilling applications including:  Water Well production (WW), Construction (C), Geotech (GR), Environmental (E), and a variety of other industrial uses.

The 790 style of Three Cone Rock bits has Center Fluid circulation. The drilling fluid is delivered to the bottom of the drill hole through the center of the bit body and also cools the bearing structure, as shown in the picture.

These bits are designed to withstand both radial and axial loading. Radial loads are carried by the Open Bearing structure(see details on page Bearing structures): Friction Ball Friction, Ball Roller, Roller Ball Friction, Roller Ball Friction Roller, Roller Ball Friction Roller Friction. The axial load is distributed over the hard surfaced load areas of the Journal. Rollers and Balls are made of vacuum-arc and electro-slag re-melted steel.

The cutting structures of the 790 style of Three Cone Rock bits may have either milled steel teeth, or tungsten carbide inserts

The 790 style of Three Cone Rock bits are available in sizes starting from 2" (75mm) to 7" (200mm).

Application Legend: C - Construction | E - Environmental | G/O - Gas/ Oil | GR - Geotech 
H/D - Horizontal/ Directional | M - Mining and Mineral Exploration | WW - Water Well

Size IADC Code Bearing Configuration: UralBMT Part No Pin Connection Recommended Applications
inch mm
2 75 211 Friction, Ball, Friction 790BMT02938211MC N Rod 4 WW, GR, C, E
321 790BMT02938321T
542 790BMT02938542C3
3 76.2 211 Friction, Ball, Friction 790BMT03000211MC N Rod 4 WW, GR, C, E
321 790BMT03000321T
542 790BMT03000542C3
3 79.4 211 Friction, Ball, Friction 790BMT03125211MC N Rod 4 WW, GR, C, E
321 790BMT03125321T
542 790BMT03125542C3
82.6 121 Friction, Ball, Friction 790BMT03250121M N Rod 4 WW, GR, C
231 790BMT03250231C
95.3 231 Friction, Ball, Friction 790BMT03750231C API Regular 2 GR, C, E
321 790BMT03750321T
339 790BMT03750339T
522 790BMT03750522M3
542 790BMT03750542C3
3 98.4 231 Friction, Ball, Friction 790BMT03875231C API Regular 2 WW, GR, C, E
321 790BMT03875321T
339 790BMT03875339T
522 790BMT03875522M3
542 790BMT03875542C3
4 101.6 231 Friction, Ball, Friction 790BMT04000231C API Regular 2 WW, GR, C, E
321 790BMT04000321T
339 790BMT04000339T
522 790BMT04000522M3
542 790BMT04000542C3
4 104.8 231 Friction, Ball, Friction 790BMT04125231C API Regular 2 WW, GR, C, E
321 790BMT04125321T
339 790BMT04125339T
522 790BMT04125522M3
542 790BMT04125542C3
114.3 111 Ball, Roller 790BMT04500111M API Regular 2 WW, GR
231 790BMT04500231C
321 790BMT04500321T
339 790BMT04500339T
522 790BMT04500522M3
522 790BMT04500522M4
120.6 111 Ball, Roller 790BMT04750111M API Regular 2 WW, GR
231 790BMT04750231C
321 790BMT04750321T
339 790BMT04750339T
523 790BMT04750523M3
523 790BMT04750523M4
543 790BMT04750543C3
543 790BMT04750543C4
4 123.8 111 Ball, Roller 790BMT04875111M API Regular 2 WW, GR
231 790BMT04875231C
321 790BMT04875321T
339 790BMT04875339T
523 790BMT04875523M3
523 790BMT04875523M4
543 790BMT04875543C3
543 790BMT04875543C4
5 127 211 Ball, Roller, Friction 790BMT05000211MC API Regular 2 WW, GR
311 790BMT05000311CT
523 790BMT05000523M3
523 790BMT05000523M4
543 790BMT05000543C3
543 790BMT05000543C4
5 130.2 111 Ball, Roller, Friction 790BMT05125111M API Regular 2 WW, GR
211 790BMT05125211MC
311 790BMT05125311CT
523 790BMT05125523M3
523 790BMT05125523M4
543 790BMT05125543C3
543 790BMT05125543C4
133.4 111 Ball, Roller, Friction 790BMT05250111M API Regular 2 WW, GR
211 790BMT05250211MC
311 790BMT05250311CT
523 790BMT05250523M3
523 790BMT05250523M4
543 790BMT05250543C3
543 790BMT05250543C4
139.7 211 Ball, Roller, Friction 790BMT05500211MC API Regular 3 ½ WW, GR
231 790BMT05500231C
311 790BMT05500311CT
321 790BMT05500321T
5 142.9 211 Roller, Ball, Friction, Roller 790BMT05625211MC API Regular 3 ½ WW, GR
231 790BMT05625231C
311 790BMT05625311CT
321 790BMT05625321T
5 149.2 111 Roller, Ball, Friction, Roller 790BMT05875111M API Regular 3 ½ WW, GR
211 790BMT05875211MC
231 790BMT05875231C
321 790BMT05875321T
339 790BMT05875339T
523 790BMT05875523M3
523 790BMT05875523M4
6 152.4 111 Roller, Ball, Friction, Roller 790BMT06000111M API Regular 3 ½ WW, GR
211 790BMT06000211MC
231 790BMT06000231C
321 790BMT06000321T
339 790BMT06000339T
523 790BMT06000523M3
523 790BMT06000523M4
6 155.6 111 Roller, Ball, Friction, Roller 790BMT06125111M API Regular 3 ½ WW, GR
211 790BMT06125211MC
231 790BMT06125231C
321 790BMT06125321T
339 790BMT06125339T
523 790BMT06125523M3
523 790BMT06125523M4
158.7 111 Roller, Ball, Friction, Roller 790BMT06250111M API Regular 3 ½ WW, GR
231 790BMT06250231C
321 790BMT06250321T
523 790BMT06250523M3
523 790BMT06250523M4
6 161.9 111 Roller, Ball, Friction, Roller 790BMT06375111M API Regular 3 ½ WW, GR
231 790BMT06375231C
321 790BMT06375321T
523 790BMT06375523M3
523 790BMT06375523M4
165.1 111 Roller, Ball, Friction, Roller 790BMT06500111M API Regular 3 ½ WW, GR
121 790BMT06500121M
231 790BMT06500231C
321 790BMT06500321T
523 790BMT06500523M3
523 790BMT06500523M4
171.4 111 Roller, Ball, Friction, Roller, Friction 790BMT06750111M API Regular 3 ½ WW, GR
231 790BMT06750231C
523 790BMT06750523M3
523 790BMT06750523M4
543 790BMT06750543C3
543 790BMT06750543C4
7 200 231 Roller, Ball, Friction, Roller, Friction 790BMT07875231C API Regular 4 ½ WW, GR
523 790BMT07875523M3
523 790BMT07875523M4

Application Legend: C - Construction | E - Environmental | G/O - Gas/ Oil | GR - Geotech 
H/D - Horizontal/ Directional | M - Mining and Mineral Exploration | WW - Water Well

Special sizes are also available upon request. Please contact us

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