The Largest Russian Manufacturer of Rock Bits
791 Style
The 791 style of Three Cone Rock bits is designed for a multitude of drilling applications including:  Mining and Mineral Exploration (M), Water Well production (WW), Construction (C),  Environmental (E), and a variety of other industrial uses.

The 791 style of Three Cone Rock bits has Center Air circulation. The drilling air is delivered to the bottom of the drill hole through the center of the bit body. Air is also delivered to the bearings, for cooling and lubrication, through a Passage in the bit leg, 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 791 style of Three Cone Rock bits may have either milled steel teeth, or tungsten carbide inserts.

The 791 style of Three Cone Rock bits are available in sizes starting from 2" (75mm) to 9" (250.8mm).

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 75 542 Friction, Ball, Friction 791BMT02938542C3 N Rod 4 WW, C, E
3 76.2 542 Friction, Ball, Friction 791BMT03000542C3 N Rod 4 WW, C, E
3 79.4 542 Friction, Ball, Friction 791BMT03125542C3 N Rod 4 WW, C, E
95.3 339 Friction, Ball, Friction 791BMT03750339T API Regular 2 C, E
522 791BMT03750522M3
542 791BMT03750542C3
3 98.4 339 Friction, Ball, Friction 791BMT03875339T API Regular 2 WW, C, E
522 791BMT03875522M3
542 791BMT03875542C3
4 101.6 339 Friction, Ball, Friction 791BMT04000339T API Regular 2 WW, C, E
522 791BMT04000522M3
542 791BMT04000542C3
4 104.8 339 Friction, Ball, Friction 791BMT04125339T API Regular 2 WW, C, E
522 791BMT04125522M3
542 791BMT04125542C3
114.3 112 Ball, Roller 791BMT04500112M API Regular 2 WW, C, E
232 791BMT04500232C
322 791BMT04500322T
339 791BMT04500339T
522 791BMT04500522M3
522 791BMT04500522M4
120.6 112 Ball, Roller 791BMT04750112M API Regular 2 WW, C, E
232 791BMT04750232C
322 791BMT04750322T
339 791BMT04750339T
523 791BMT04750523M3
523 791BMT04750523M4
543 791BMT04750543C3
543 791BMT04750543C4
4 123.8 112 Ball, Roller 791BMT04875112M API Regular 2 WW, C, E
232 791BMT04875232C
322 791BMT04875322T
339 791BMT04875339T
523 791BMT04875523M3
523 791BMT04875523M4
543 791BMT04875543C3
543 791BMT04875543C4
5 127 212 Ball, Roller, Friction 791BMT05000212MC API Regular 2 WW, C, E
312 791BMT05000312CT
523 791BMT05000523M3
523 791BMT05000523M4
543 791BMT05000543C3
543 791BMT05000543C4
5 130.2 112 Ball, Roller, Friction 791BMT05125112M API Regular 2 WW, C, E
212 791BMT05125212MC
312 791BMT05125312CT
523 791BMT05125523M3
523 791BMT05125523M4
543 791BMT05125543C3
543 791BMT05125543C4
133.4 112 Ball, Roller, Friction 791BMT05250112M API Regular 2 WW, C, E
212 791BMT05250212MC
312 791BMT05250312CT
523 791BMT05250523M3
523 791BMT05250523M4
543 791BMT05250543C3
543 791BMT05250543C4
5 149.2 112 Roller, Ball, Friction, Roller 791BMT05875112M API Regular 3 ½ WW, C, E
212 791BMT05875212MC
232 791BMT05875232C
322 791BMT05875322T
339 791BMT05875339T
523 791BMT05875523M3
523 791BMT05875523M4
6 152.4 112 Roller, Ball, Friction, Roller 791BMT06000112M API Regular 3 ½ WW, C, E
212 791BMT06000212MC
232 791BMT06000232C
322 791BMT06000322T
339 791BMT06000339T
523 791BMT06000523M3
523 791BMT06000523M4
6 155.6 112 Roller, Ball, Friction, Roller 791BMT06125112M API Regular 3 ½ WW, C, E
212 791BMT06125212MC
232 791BMT06125232C
322 791BMT06125322T
339 791BMT06125339T
523 791BMT06125523M3
523 791BMT06125523M4
158.7 112 Roller, Ball, Friction, Roller 791BMT06250112M API Regular 3 ½ WW, C, E
232 791BMT06250232C
322 791BMT06250322T
523 791BMT06250523M3
523 791BMT06250523M4
6 161.9 112 Roller, Ball, Friction, Roller 791BMT06375112M API Regular 3 ½ WW, C, E
232 791BMT06375232C
322 791BMT06375322T
523 791BMT06375523M3
523 791BMT06375523M4
165.1 112 Roller, Ball, Friction, Roller 791BMT06500112M API Regular 3 ½ WW, C, E
122 791BMT06500122M
232 791BMT06500232C
322 791BMT06500322T
523 791BMT06500523M3
523 791BMT06500523M4
171.4 112 Roller, Ball, Friction, Roller, Friction 791BMT06750112M API Regular 3 ½ WW, C, E
232 791BMT06750232C
523 791BMT06750523M3
523 791BMT06750523M4
543 791BMT06750543C3
543 791BMT06750543C4
7 200 232 Roller, Ball, Friction, Roller, Friction 791BMT07875232C API Regular 4 ½ WW, C, E
523 791BMT07875523M3
523 791BMT07875523M4
9 250.8 523 Roller, Ball, Friction, Roller, Friction 791BMT09875523M4 API Regular 4 ½ M
543 791BMT09875543C4

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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