3-Inch DTH Hammers
Drill King’s 3-inch DTH hammer lineup delivers high-frequency impacts and strong drilling performance for compact applications. Engineered with premium alloys and precision-machined components, both the A30I and A30I-XT operate reliably across demanding conditions—ideal for water well, geotechnical, and construction drilling projects.
Bit Range
3.35″–4.1″
(85–104 mm)
Impact Frequency
1,450 bpm
Working Pressure
150–350 PSI
SHANK SUPPORT
IR3.5, DHD3.5
Why Drill King?
Maximized Uptime
All Drill King hammers support field servicing through our repair and rebuild Kits so the hammer never leaves the jobsite.
Versatile Pressure Range
A30I hammers operate from 150–350 PSI (10.3–24.1 Bar), providing efficient performance at 150 PSI and high-speed penetration at 350 PSI
High-Impact Frequency
At 1,450 blows per minute, our A30I hammers deliver consistent energy transfer to the bit, achieving faster penetration in hard-rock.
Application Flexibility
Two hammer models, adjustable flow rate chokes, and endless bit configurations to suit any application.
Extended Component Life
Premium materials and wear-resistant surface treatments extend tool life and reduce operating cost.
Technical Specifications
Select a model to view its full parts list, dimensions, exploded-view diagram, and air consumption profile.
HADK- A30I
Drill King’s standard 3″ DTH hammer with IR3.5 style shank. Built for high penetration rates, efficiency, and durability.
Top Sub Connection
2-3/8 API REG PIN
Eff. Length
31.29 in / 794.7 mm
OD
3.35 in / 85.1 mm
Hammer Weight
53 lbs / 24 kg
| No | Part Name | Qty | Part Number |
|---|---|---|---|
| 1 | Top Sub | 1 | HPDK-A3002 |
| 2 | Top Sub O-Ring | 1 | See Sealkit |
| 3 | Choke Set | 1 | HPDK-A3008 |
| 4 | Check Valve | 1 | HPDK-A3007 |
| 5 | C.V. Spring | 1 | HPDK-A3009 |
| 6 | Spacer Ring | 1 | HPDK-A3005 |
| 7 | Make Up Ring | 1 | HPDK-A3006 |
| 8 | Air Distributor | 1 | HPDK-A3010 |
| 9 | Air Dis. O-Ring | 1 | See Sealkit |
| 10 | Cylinder | 1 | HPDK-A3012 |
| 11 | Piston | 1 | HPDK-A3014 |
| 12 | Wear Sleeve | 1 | HPDK-A3001 |
| 13 | Piston Ret. Ring | 1 | HPDK-A3017 |
| 14 | Bit Bearing | 1 | HPDK-A3020 |
| 15 | Bit Ret. Ring | 1 | HPDK-A3018 |
| 16 | Bit Ret. Ring O-Ring | 1 | See Sealkit |
| 17 | Drive Sub (Chuck) | 1 | HPDK-A3022 |
| Sealkit (Items 2, 9, 16) | 1 | HPDK-A30SEALKIT |
| Top Sub Connection | 2-3/8 API REG PIN |
| Eff. Length (in / mm) | 31.29 / 794.7 |
| OD (in / mm) | 3.35 / 85.1 |
| Hammer Weight (lbs / Kg) | 53 / 24 |
| Piston Weight (lbs / Kg) | 8.4 / 3.82 |
| Working Pressure (PSI/Bar) | 150-350 / 10.3-24.1 |
| Application Bit (in / mm) | 3.5-4.1 / 89-104 |
| Rotation Speed | 20-60 RPM |
| Make-Up Torque (lb·Ft/N·m) | 2000 / 2712 |
| Rotation Torque (lb·Ft/N·m) | 500 / 687 |
| Frequency (blows/min) | 1450 |
Exploded View — A30I (IR3.5)
HADK- A30I-XT
Slimmer variant of A30I with a 3.11″ OD and longer effective length, engineered for tighter holes without compromising power.
Top Sub Connection
2-3/8 API REG PIN
Eff. Length
33.00 in / 838.2 mm
OD
3.11 in / 79 mm
Hammer Weight
52.9 lbs / 23.9 kg
| No | Part Name | Qty | Part Number |
|---|---|---|---|
| 1 | Top Sub | 1 | HPDK-A3002-XT |
| 2 | Top Sub O-Ring | 1 | HPDK-A3003-XT |
| 3 | Disc Spring | 2 | HPDK-A3006-XT |
| 4 | Spacer Ring | 1 | HPDK-A3005-XT |
| 5 | Choke Set | 1 | HPDK-A3008 |
| 6 | Check Valve | 1 | HPDK-A3007 |
| 7 | C.V. Spring | 1 | HPDK-A3009-XT |
| 8 | Air Distributor | 1 | HPDK-A3010-XT |
| 9 | Cylinder Ret. Ring | 1 | HPDK-A3013-XT |
| 10 | Cylinder | 1 | HPDK-A3012-XT |
| 11 | Piston | 1 | HPDK-A3014-XT |
| 12 | Wear Sleeve | 1 | HPDK-A3001-XT |
| 13 | Piston Ret. Ring | 1 | HPDK-A3017-XT |
| 14 | Bit Bearing | 1 | HPDK-A3020-XT |
| 15 | Bit Ret. Ring | 1 | HPDK-A3018-XT |
| 16 | Bit Ret. Ring O-Ring | 1 | HPDK-A3019-XT |
| 17 | Drive Sub | 1 | HPDK-A3022-XT |
| Sealkit (Items 2, 9, 16) | 1 | HPDK-A30SEALKIT |
| Top Sub Connection | 2 3/8 API REG PIN |
| Eff. Length (in / mm) | 33.00 / 838.2 |
| OD (in / mm) | 3.11 / 79 |
| Hammer Weight (lbs / Kg) | 52.9 / 23.9 |
| Piston Weight (lbs / Kg) | 8 / 3.6 |
| Working Pressure (PSI/Bar) | 150-350 / 10.3-24.1 |
| Application Bit (in / mm) | 3.35-4 / 85-101 |
| Rotation Speed (RPM) | 20-60 |
| Make-Up Torque (lb·Ft/N·m) | 2000 / 2712 |
| Rotation Torque (lb·Ft/N·m) | 500 / 687 |
| Frequency (blows/min) | 1450 |
Exploded View — A30I-XT (IR3.5)
