High-frequency impact performance for compact and mid-range drilling applications. Two models on the trusted IR3.5 air distribution system — the standard HADK-A30I and the extended-body HADK-A30I-XT.
Drill King International’s 3-inch DTH hammer lineup delivers high-frequency impact performance for compact and mid-range drilling applications. Engineered with premium alloys and precision-machined components, the IR3.5 platform operates reliably across a wide pressure range, making it an ideal choice for water well, geotechnical, and construction drilling projects.
Two distinct models are available to match your operational requirements — the HADK-A30I and the extended-body HADK-A30I-XT — both built on the trusted IR3.5 air distribution system.
Both models support field-level servicing through Drill King's Repair & Rebuild kits, reducing costly downtime and reliance on specialist technicians.
Effective from 150 to 350 PSI (10.3–24.1 Bar), the IR3.5 platform adapts to a broad range of compressor setups on site.
At 1,450 blows per minute, both hammers deliver consistent energy transfer to the bit, achieving faster rock penetration in hard-formation drilling.
Configurable for open hole and cased hole projects — suits geotechnical investigation, water well construction, and foundation drilling.
Premium alloy selection and precision surface treatment across all wear-critical components reduce replacement frequency and total cost of ownership.
Reliable performance across varied formations makes the IR3.5 platform an ideal choice for water well construction.
Compact 3-inch class suits site investigation and testing programs on construction and infrastructure projects.
Configurable for open hole or cased hole work, supporting piling and ground anchoring projects.
| Parameter | HADK-A30I | HADK-A30I-XT |
|---|---|---|
| Shank Type | IR | IR |
| Top Sub Connection | 2-3/8" API REG PIN | 2-3/8" API REG PIN |
| Effective Length | 31.29" / 794.70 mm | 33" / 838.20 mm |
| Outer Diameter (OD) | 3.35" / 85.10 mm | 3.11" / 79 mm |
| Hammer Weight | 53 lbs / 24 kg | 52.90 lbs / 23.90 kg |
| Piston Weight | 8.40 lbs / 3.82 kg | 8 lbs / 3.60 kg |
| Application Bit Range | 3.50" – 4.10" / 89 – 104 mm | 3.35" – 4" / 85 – 101 mm |
| Working Pressure | 150–350 PSI / 10.30–24.10 Bar | 150–350 PSI / 10.30–24.10 Bar |
| Rotation Speed | 20–60 RPM | 20–60 RPM |
| Frequency | 1,450 BPM | 1,450 BPM |
| Bit Compatibility | DHD Type Button Bits only | Standard Button Bits |
| Pressure (PSI) | Pressure (Bar) | CFM | M³/Min |
|---|---|---|---|
| 150 | 10.30 | 215 | 6.09 |
| 250 | 17.20 | 359 | 9.91 |
| 350 | 24.10 | 480 | 13.59 |
| Pressure (PSI) | Pressure (Bar) | CFM | M³/Min |
|---|---|---|---|
| 150 | 10.30 | 215 | 6.09 |
| 250 | 17.20 | 359 | 9.91 |
| 350 | 24.10 | 480 | 13.59 |
Drill King's standard 3" down-the-hole hammer, purpose-built for DHD type Button Bits and optimized for open hole and cased hole drilling.
Download ↓Extended-body variant with a slimmer 3.11" OD and longer effective length — engineered for a lower-profile hammer body without compromising power.
Download ↓Engineered for Excellence in Mansfield, TX.
Built tough enough for the unpredictability of job sites, our equipment minimizes costly downtime and re-drills.
Every hole counts, and our tools are built to keep penetration rates high even in unpredictable, mixed formations.
Engineered for open-pit and underground alike, our tools lower per-meter drilling costs without sacrificing performance.
Engineered for the rigors of well-site conditions, our hammers and bits extend service life while reducing per-foot drilling costs.
Less downtime, fewer bit changes, more material moved. That's the Drill King difference for quarry operators who can't afford to slow down.
From residential wells to large-scale geothermal fields, our tools are trusted to get the job done right the first time
