High-frequency, high-torque performance for medium-to-large diameter drilling programs. Five models on a common platform — HADK-A50I, A50IHD, A50S, A50Q, and A50QHD — matching the exact shank standard and duty cycle your project demands.
Drill King International’s 5-inch DTH hammer series brings high-frequency, high-torque performance to medium-to-large diameter drilling programs. Five models share a common platform and air distribution design, differing in bit shank compatibility and reinforced construction: HADK-A50I (IR350), HADK-A50IHD (IR350 Heavy Duty), HADK-A50S (SD5), HADK-A50Q (QL50), and HADK-A50QHD (QL50 Heavy Duty). This breadth lets operators standardize on a single 5-inch platform while matching the exact shank standard and duty cycle their bit inventory and project conditions demand.
Built from premium alloys with precision heat treatment, the A50 series delivers consistent impact energy at 1,540 blows per minute across a 150–350 PSI working range. Drill King’s Repair & Rebuild kits keep all five models field-serviceable, minimizing downtime on mining, quarrying, water well, and geotechnical sites worldwide.
Available for easy and cost-effective field maintenance across all five models.
1,540 blows/min for fastest penetration rates in 5-inch class drilling.
IR350, SD5, and QL50 shanks supported, with standard and Heavy-Duty (H.D.) variants for IR350 and QL50.
Shared across all five models — simplifying training, field diagnostics, and compressor planning.
Available for project-specific requirements.
All wear-critical components treated for extended service intervals.
725 lb·Ft / 983 N·m rating across all models, suited to harder rock formations.
High rotation torque and 1,540 blows-per-minute frequency built for the sustained, high-energy demands of production mining and quarry blast-hole drilling.
Broad pressure range and reliable air distribution make the A50 platform a strong fit for municipal and agricultural water well construction across varied formations.
Configurable for open hole or cased hole operation — supports piling, ground anchoring, and site investigation work where bore stability is essential.
H.D. variants (A50IHD, A50QHD) add reinforced top sub and wear sleeve components, suited to high-torque, abrasive, or extended-depth drilling programs.
| Parameter | HADK-A50I | HADK-A50IHD | HADK-A50S | HADK-A50Q | HADK-A50QHD |
|---|---|---|---|---|---|
| Shank Type | IR | IR | SD | QL | QL |
| Top Sub Connection | 3-1/2" API REG PIN | 3-1/2" API REG PIN | 3-1/2" API REG PIN | 3-1/2" API REG PIN | 3-1/2" API REG PIN |
| Effective Length | 43.75" / 1,111 mm | 43.75" / 1,111 mm | 43.64" / 1,108.40 mm | 42.78" / 1,087 mm | 42.78" / 1,087 mm |
| Outer Diameter (OD) | 4.76" / 121 mm | 4.96" / 126 mm | 4.76" / 121 mm | 4.76" / 121 mm | 5" / 127 mm |
| Hammer Weight | 137 lbs / 62.10 kg | 144 lbs / 65.30 kg | 137 lbs / 62.10 kg | 137 lbs / 62.10 kg | 165 lbs / 74.80 kg |
| Piston Weight | 25 lbs / 11.30 kg | 25 lbs / 11.30 kg | 25 lbs / 11.30 kg | 25 lbs / 11.30 kg | 25 lbs / 11.30 kg |
| Application Bit Range | 5" – 6.25" / 127 – 152 mm | 5" – 6.25" / 127 – 159 mm | 5" – 6" / 127 – 152 mm | 5" – 6" / 127 – 152 mm | 5" – 6.25" / 127 – 152 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 | 150–350 PSI / 10.30–24.10 Bar | 150–350 PSI / 10.30–24.10 Bar |
| Rotation Speed | 15–40 RPM | 15–40 RPM | 15–40 RPM | 15–40 RPM | 15–40 RPM |
| Frequency | 1,540 BPM | 1,540 BPM | 1,540 BPM | 1,540 BPM | 1,540 BPM |
| Pressure (PSI) | Pressure (Bar) | CFM | M³/Min |
|---|---|---|---|
| 150 | 10.30 | 310 | 8.80 |
| 250 | 17.20 | 555 | 15.70 |
| 350 | 24.10 | 720 | 20.40 |
| Pressure (PSI) | Pressure (Bar) | CFM | M³/Min |
|---|---|---|---|
| 150 | 10.30 | 310 | 8.80 |
| 250 | 17.20 | 555 | 15.70 |
| 350 | 24.10 | 720 | 20.40 |
| Pressure (PSI) | Pressure (Bar) | CFM | M³/Min |
|---|---|---|---|
| 150 | 10.30 | 310 | 8.80 |
| 250 | 17.20 | 555 | 15.70 |
| 350 | 24.10 | 720 | 20.40 |
| Pressure (PSI) | Pressure (Bar) | CFM | M³/Min |
|---|---|---|---|
| 150 | 10.30 | 310 | 8.80 |
| 250 | 17.20 | 555 | 15.70 |
| 350 | 24.10 | 720 | 20.40 |
| Pressure (PSI) | Pressure (Bar) | CFM | M³/Min |
|---|---|---|---|
| 150 | 10.30 | 310 | 8.80 |
| 250 | 17.20 | 555 | 15.70 |
| 350 | 24.10 | 720 | 20.40 |
Choose the HADK-A50IHD or HADK-A50QHD when you need the same shank compatibility with a reinforced top sub and wear sleeve — for higher-torque, more abrasive, or extended-depth drilling programs.
HADK-A50I/A50IHD run IR (Ingersoll Rand) 350 shanks; HADK-A50S runs SD (Sandvik/Epiroc) 5-inch shanks common on quarrying and mining rigs; HADK-A50Q/A50QHD run QL (Atlas Copco) 50 shanks, frequent on rigs sourced from European and Australian markets.
Standard IR (Ingersoll Rand) 350 shank for general-purpose 5-inch drilling.
Download ↓IR350 shank compatibility with a reinforced top sub and wear sleeve for higher-torque or abrasive ground.
Download ↓SD 5-inch shank, common on quarrying and mining rigs configured for SD-series bits.
Download ↓QL (Atlas Copco) 50 shank, A high-frequency, easy-to-maintain tool built with premium alloys for durability, fitting common bit shanks and customizable for open- or cased-hole projects.
Download ↓QL50 shank compatibility with the added durability of a reinforced top sub and wear sleeve.
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
