Reliable, high-frequency percussive performance across a wide range of ground conditions. The A40 series comes in three industry-standard shank configurations — IR340, SD4, and QL4 — so drillers match the hammer to their existing drill string and bit inventory.
Drill King International’s 4-inch Down-The-Hole (DTH) hammer series delivers reliable, high-frequency percussive performance across a wide range of ground conditions and drilling applications. Engineered for contractors who demand consistency, speed, and value, the A40 series hammers are built with premium alloys and precision-treated components — ensuring long tool life and predictable results in the field.
The A40 series is available in three industry-standard shank configurations — IR340, SD4, and QL4 — giving drillers the flexibility to match the hammer to their existing drill string and bit inventory without compromise. All three models share the same core internal architecture and drilling parameters, differing only in shank type. Repair & Rebuild kits (seal kits covering O-rings) are available for all variants under part number HPDK-A40SEALKIT.
1,350 blows/min design delivers maximum penetration rates in hard rock formations, with consistent performance across the full 150–350 PSI working pressure range. Suitable for open hole or cased hole drilling projects.
Available as IR340 (HADK-A40I), SD4 (HADK-A40S), and QL4 (HADK-A40Q) — compatible with application bits from 4" to 5" (101–127 mm), with customizable configurations to suit specific project requirements.
Premium alloys and surface treatments throughout extend tool service life in abrasive formations. Repair & Rebuild kits enable cost-effective field-level maintenance, and standardized internal components across shank variants reduce spare parts inventory.
High-frequency percussion suited to sustained production drilling in quarry operations.
Open hole or cased hole configurations for piling, anchoring, and foundation work.
Consistent penetration across varied formations for water well construction.
Reliable 4-inch class performance for site investigation programs.
Exploration and production drilling, including blast hole drilling in open-pit and surface mining.
| Parameter | HADK-A40I | HADK-A40S | HADK-A40Q |
|---|---|---|---|
| Shank Type | IR | SD | QL |
| Top Sub Connection | 2-3/8" API REG PIN | 2-3/8" API REG PIN | 2-3/8" API REG PIN |
| Effective Length | 36.41" / 924.80 mm | 38.48" / 978 mm | 39.20" / 995.60 mm |
| Outer Diameter (OD) | 3.86" / 98 mm | 3.86" / 98 mm | 3.86" / 98 mm |
| Piston Weight | 16.30 lbs / 7.40 kg | 16.30 lbs / 7.40 kg | 16.30 lbs / 7.40 kg |
| Application Bit Range | 4" – 5" / 101 – 127 mm | 4" – 5" / 101 – 127 mm | 4" – 5" / 101 – 127 mm |
| Working Pressure | 150–350 PSI / 10.30–24.10 Bar | 150–350 PSI / 10.30–24.10 Bar | 150–350 PSI / 10.30–24.10 Bar |
| Rotation Speed | 20–45 RPM | 20–45 RPM | 20–45 RPM |
| Frequency | 1,350 BPM | 1,350 BPM | 1,350 BPM |
| Pressure (PSI) | Pressure (Bar) | CFM | M³/Min |
|---|---|---|---|
| 150 | 10.30 | 230 | 6.50 |
| 250 | 17.20 | 425 | 12 |
| 350 | 24.10 | 640 | 18.10 |
| Pressure (PSI) | Pressure (Bar) | CFM | M³/Min |
|---|---|---|---|
| 150 | 10.30 | 230 | 6.50 |
| 250 | 17.20 | 425 | 12 |
| 350 | 24.10 | 640 | 18.10 |
| Pressure (PSI) | Pressure (Bar) | CFM | M³/Min |
|---|---|---|---|
| 150 | 10.30 | 230 | 6.50 |
| 250 | 17.20 | 425 | 12 |
| 350 | 24.10 | 640 | 18.10 |
Standard IR340 shank configuration for general-purpose 4-inch open hole and cased hole drilling.
Download ↓SD4 shank configuration for operations running Sandvik/Epiroc-standard bit inventories.
Download ↓QL4 shank configuration for rigs and bit inventories sourced from European or Australian markets.
Download ↓Our team can help match the right hammer configuration to your drill rig, bit inventory, and formation conditions. Get in touch with a Drill King applications specialist today.
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
