9‑inch (228 mm) Step Drag Bits with Carbide Tips, Alloy Drill Bits, 228 mm Water Well Drilling Bits
A drill bit is a specialised tool used for drilling operations, typically referring to drilling equipment that is pulled and powered by an external energy source (e.g., a tractor). Its primary function is to cut and remove soil or rock by means of a rotating bit. This type of equipment is widely used in areas such as deep planting, afforestation, and water well drilling.
The tractor‑driven drilling machine is specifically designed for deep planting and afforestation, using a tractor as both the towing and power source. The equipment drives the drill bit in rotation and lifting through a hydraulic system, ensuring efficient drilling. Its development has gone through three generations of improvements, from side‑mount to rear‑mount configurations, with productivity increasing from 60–90 trees per hour to 90–120 trees per hour.
| Size | Thread Type (Pin) | Weight (lbs) |
|---|
| 3 7/8" – 4 3/4" | 2 3/8" REG Pin | 6 |
| 4 7/8" – 5 1/8" | 2 3/8" REG Pin | 7 |
| 5 1/4" – 5 1/2" | 2 3/8" REG Pin | 8 |
| 4 5/8" – 5" | 2 7/8" REG Pin | 10 |
| 5 1/8" – 5 1/2" | 2 7/8" REG Pin | 11 |
| 5 5/8" – 6 1/4" | 3 1/2" REG Pin | 18 |
| 6 1/2" – 6 3/4" | 3 1/2" REG Pin | 19 |
Three‑blade step drag bits are manufactured as a one‑piece alloy steel construction with tungsten carbide cutting tips and gauge‑protecting side surfaces for extended service life. They have 3 blades and 3 wash ports. Compared to 4‑blade designs, 3‑blade step drag bits generally drill faster and more aggressively, but have a shorter service life and are less durable. 3‑blade step drag bits generate greater cutting force than chevron‑type bits. When using step drag bits, the rotary table speed should be maintained between 60 and 80 rpm with a light weight‑on‑bit (WOB).
Three‑blade step drag bits are a cost‑effective drilling tool for soft geological formations at shallow depths; they are primarily intended for soft to medium‑hard formations such as clay, loam, silt, and most soft to medium‑hard soils with a certain moisture content, etc. Furthermore, step drag bits are recommended for drilling in mining, geological exploration, environmental applications, water well construction, geothermal systems, and similar projects.
3‑Wing Step Drag Bits
| Diameter | Thread |
|---|
| From 2 to 17½ inches (50.8 – 444.5 mm) | Optional (as required) |
Note: The diameters and threads listed above are standard sizes; other sizes are available upon request.
Thread sizes available:
2 3/8″ REG, 2 7/8″ REG, 3 1/2″ REG, 4 1/2″ REG, 6 5/8″ REG, 2″ API IF, 2 3/8″ IF, 2 7/8″ IF, A Rod, N Rod, AW, BW, NW, AWJ, BWJ, NWJ.
