18-Inch DTH Hammers
Drill King’s 18-inch DTH hammer is built for the largest-diameter mining and quarrying applications in the lineup. The HADK-185 (SD18) delivers superior technology and a hardened piston for standard bit diameters from 18″ to 24″ (457–610 mm).
Bit Range
18″–24″
(457–610 mm)
Impact Frequency
Up to 1,100 bpm
Working Pressure
100–200 PSI
SHANK SUPPORT
SD18
Why Drill King?
Superior Technology
The HADK-185 delivers more energy per blow, translating directly into faster penetration on the largest hole diameters Drill King offers.
Hardened Piston
A hardened piston extends component life under the sustained high-torque loads typical of 18" drilling.
Massive Rotation Torque
10,000 lb·Ft (13,560 N·m) of rotation torque drives the largest-diameter bits through the toughest formations.
Robust SD15 Shank
A dedicated SD18 shank design matches the largest-diameter rigs without custom tooling.
Maximized Uptime
Repair and rebuild kits keep the hammer field-serviceable, minimizing downtime on the largest-scale projects.
Extended Component Life
Premium alloys and wear-resistant surface treatments extend tool life and reduce operating cost on the largest-diameter tooling.
Technical Specifications
Full parts list, dimensions, exploded-view diagram, and air consumption profile for the HADK-185.
HADK- 185
Top Sub Connection
8-5/8" API REG BOX
Eff. Length
78 in / 1981 mm
OD
16.3 in / 415 mm
Hammer Weight
3653 lbs / 1657 kg
| No | Part Name | Qty | Part Number |
|---|---|---|---|
| 1 | Top Sub | 1 | HPDK18502 |
| 2 | Washer – Top | 1 | HPDK18504 |
| 3 | Top Sub O-Ring | 1 | HPDK18503 |
| 4 | Check Valve | 1 | HPDK18507 |
| 5 | C.V. Spring | 1 | HPDK18509 |
| 6 | Spacer Ring | 1 | HPDK18505 |
| 7 | Disc Spring Set | 1 | HPDK18506 |
| 8 | Air Distributor | 1 | HPDK18510 |
| 9 | Air Dist. O-Ring | 1 | HPDK18511 |
| 10 | Cylinder | 1 | HPDK18512 |
| 11 | Piston | 1 | HPDK18514 |
| 12 | Wear Sleeve | 1 | HPDK18501 |
| 13 | Upper Bearing | 2 | HPDK18520U |
| 14 | Snap Ring | 1 | HPDK18515 |
| 15 | Bit Ret. Ring | 1 | HPDK18518 |
| 16 | Bit Ret. Ring O-Ring | 1 | HPDK18519 |
| 17 | Lower Bearing | 1 | HPDK18520L |
| 18 | Drive Sub Washer | 1 | HPDK18524 |
| 19 | Drive Sub | 1 | HPDK18522 |
| Choke Set | 1 | HPDK18508 | |
| Complete Hammer | 1 | HADK-185 | |
| Top Sub Connection | 8-5/8″ API REG BOX |
| Eff. Length (in / mm) | 78 / 1981 |
| OD (in / mm) | 16.3 / 415 |
| Hammer Weight (lbs / kg) | 3653 / 1657 |
| Piston Weight (lbs / kg) | 717 / 325 |
| Working Pressure (PSI / Bar) | 100-200 / 7-14 |
| Application Bit (in / mm) | 18-24 / 457-610 |
| Rotation Speed (RPM) | 5-15 |
| Make-Up Torque (lb·Ft / N·m) | 12000 / 16272 |
| Rotation Torque (lb·Ft / N·m) | 10000 / 13560 |
| Frequency (blows / min) | 1100 |
Exploded View — HADK-185 (SD18)
