KAT DRILLING
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BIR SERIES DTH Hammers: BR1 / BR2 / BR3
These hammers are widely used for mine, quarry, and road construction for drilling and blasting work, as well as water well drilling, slope protection, anchoring, and more.
| Type | Model | Length | Weight | External Dia. (mm) | Hole Range |
|---|---|---|---|---|---|
| (mm) | (kg) | (mm) | |||
| 3.5 inch | DHD3.5 | 930 | 25 | Φ82 | Φ90-110 |
| 4 inch | DHD340 | 1030 | 39 | Φ99 | Φ110-135 |
| SD4 | 1084 | 40.5 | Φ99 | ||
| QL4 | 1097 | 41 | Φ99 | ||
| Mission40 | 1005 | 40 | Φ99 | ||
| 5 inch | DHD350 | 1214 | 76.5 | Φ125 | Φ135-155 |
| SD5 | 1175 | 72.5 | Φ125 | ||
| QL5 | 1147 | 73 | Φ125 | ||
| Mission50 | 1110 | 68.5 | Φ125 | ||
| 6 inch | DHD360 | 1248 | 100 | Φ142 | Φ155-190 |
| SD6 | 1261 | 100 | Φ142 | ||
| QL6 | 1212 | 95 | Φ146 | ||
| Mission60 | 1161 | 90 | Φ146 | ||
| 8 inch | D85 | 1492 | 188 | Φ180 | Φ195-254 |
| SD8 | 1463 | 192 | Φ180 | ||
| QL8 | 1465 | 182 | Φ180 | ||
| Mission80 | 1338 | 176 | Φ180 | ||
| 10 inch | SD10 | 1502 | 290 | Φ226 | Φ254-311 |
| NUMA100 | 1510 | 288 | Φ226 |
| Hammer Length without bit: | 871 (mm) |
| Top sub thread: | API 2 3/8"REG PIN |
| Outside diameter: | 82(mm) |
| Weight: | 21(KG) |
| Bit diameter: | 90-115(mm) |
| Working Pressure: | 1.0-1.7MPa |
| Air consumption: | 4-7(M3/min) |
| Bit shank: | BR3 |
The operating air pressures for BR3 DTH hammers typically range between 0.8Mpa and 1.5Mpa, with a working pressure specification of 1.0-1.7MPa for specific models.
The valveless hammer design features a simple structure, making it much easier to assemble and disassemble while ensuring a longer service life and higher impact frequency.
These tools are extensively used in mining, quarrying, road construction for blasting work, water well drilling, and civil engineering projects like anchoring and slope protection.
Design highlights indicate that these hammers are engineered for lower air and oil consumption, which helps reduce operational costs without sacrificing drilling speed.
A 4-inch DTH hammer (such as the DHD340 or SD4 models) is designed for a hole range between Φ110mm and Φ135mm.
The BR3 DTH hammer uses a standard API 2 3/8" REG PIN top sub thread for reliable connection to the drill string.
