Our products are mainly used in large-scale open mining of iron ores, nonferrous metal ores, coal mine and hydrogeologic prospecting, etc. I Product Series of Rock Bit 1.  Kx54 series, Kx64 series2.  74 series3.  84 series II Data Table of Rock BitÂ
| Product Serries | Type | Color of Bit | Features of Rock | Examples of Rock | Recommended Weight on Bit(WOB) | Revolutions per Minute |
| Kx5---- | 01234 | Yellow | Soft rock & Medium-hard rock of low compressive strength | Shale,Sandstone, Soft limestone | (kg/cm.c)200-700(1b/IN.c)1121--5046 | (rpm.)80--120 |
| Kx6---- | 01234 | Green | Medium-hard rock of high compressive strength | Hard shale, Sandstone, Limestone,Dolostone | (kg/cm.c)500-900(1b/IN.c)2804--5046 | (rpm.)60--100 |
| Kx7---- | 01234 | Blue | Hard rock of half-abrasiveness or abrasiveness | Quartz sandstone,Hard dolostone,Granite | (kg/cm.c)700-1500(1b/IN.c)3925--8410 | (rpm.)50--80 |
| Kx8---- | 01234 | Red | Super hard rock of abrasiveness | Granite,Basalt,Magnetite rock,   Taconite | (kg/cm.c)700-1500(1b/IN.c)3925--8410 | (rpm.)50--80 |
  III.Corresponding table of bit size, threads and nozzle's sizeÂ
| Bit Size | Connecting Threads | External Diameter of Nozzles | Assemble Length of Nozzles | Internal Diameter of Nozzles | |||||
| In. | mm | In. | In. | mm. | In. | mm. | In. | mm. | |
| 5-7/8 | 150 | API 3-1/2 Reg | 15/16 | 24 | 25/32 | 20 | 3/815/3219/3221/32 | 10121517 | |
| 6-1/4 | 158 | API 3-1/2 Reg | 15/16 | 24 | 25/32 | 20 | |||
| 6-1/2 | 165 | API 3-1/2 Reg | 15/16 | 24 | 25/32 | 20 | |||
| 6-3/4 | 170 | API 3-1/2 Reg | 15/16 | 24 | 25/32 | 20 | |||
| 7-3/8 | 187 | API 3-1/2 Reg | 15/16 | 24 | 25/32 | 20 | |||
| 7-7/8 | 200 | API 4-1/2 Reg | 15/16 | 24 | 25/32 | 20 | 15/3219/3221/323/425/32 | 1215171921 | |
| 8-1/2 | 215 | API 4-1/2 Reg | 1-3/16 | 30 | 31/32 | 25 | |||
| 8-3/4 | 225 | API 4-1/2 Reg | 1-3/16 | 30 | 31/32 | 25 | |||
| 9-7/8 | 250 | API 6-5/8 Reg | 1-3/16 | 30 | 31/32 | 25 | |||
| 10-5/8 | 270 | API 6-5/8 Reg | 1-3/16 | 30 | 31/32 | 25 | |||
| 11 | 280 | API 6-5/8 Reg | 1-3/16 | 30 | 31/32 | 25 | |||
| 19/3221/323/425/3227/327/828/32 | 15171920212223 | ||||||||
| 12-1/4 | 310 | API 6-5/8 Reg | 1-11/32 | 34 | 1-3/8 | 35 | |||
| 12-3/4 | 350 | API 6-5/8 Reg | 1-11/32 | 34 | 1-3/8 | 35 | |||
| 15 | 380 | API 7-5/8 Reg | 1-11/32 | 34 | 1-3/8 | 35 | |||
  IV,Coating Rock-bit for delivery V. Derivative productMature technology of mining rock-bit has been introduced into the construction field to develop the combined bit and its related product for large scale project. The 800-3000mm large combined cutter-bit have achieved exnt performance in piers, cofferdams and tunnels' drilling construction. "Quality first,reputation above all" is our forever business principle. We serve the international market with first class quality product and update service. Â
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