4-Inch DTH Water Hammer
Bit Range (114–127 mm)
4.5″–5″
Impact Frequency
3,870 bpm
Working Pressure
900–2450 PSI
Drive Type
Fluid (WAI IR340)
Why Drill King?
Straighter Holes
The W40I will drill a straighter hole than a conventional air hammer, reducing hole deviation on demanding projects.
Hi-Frequency Design
At 3,870 blows per minute — the highest impact frequency in the water hammer lineup — the W40I delivers environmentally friendly drilling for fastest penetration rates.
Lower Operating Costs
Reduced energy consumption versus conventional air hammers means lower operating costs over the life of the tool.
Simple ECO Service Kits
Low-maintenance ECO kits are designed for self-service schedules, keeping the hammer field-serviceable without specialized tooling.
Configurable Wear Sleeve
Choose a smooth wear sleeve or one with integrated stabilizing ribs to minimize hole deviation for your application.
Open or Cased Hole
Customizable to optimize performance in open hole or cased hole projects alike.
Technical Specifications
Full parts list, dimensions, exploded-view diagram, and fluid consumption profile for the HADK-W40I.
WAI IR3.5
HADK- W40I
Top Sub Connection
2-3/8" API REG PIN
OAL
48.5 in / 1232 mm
OD Range
4.37 in / 111 mm
Weight w/o Bit
129 lbs / 59 kg
| No | Part Name | Qty | Part Number |
|---|---|---|---|
| 1 | Top Sub | 1 | HPDK-W4002 |
| 2 | Top Sub O-Ring | 1 | See Sealkit |
| 3 | Filter Cage | 1 | HPDK-W4027 |
| 4 | Filter | 1 | HPDK-W4026-1 |
| 5 | Check Valve | 1 | HPDK-W4004 |
| 6 | C.V. Spring | 1 | HPDK-W4003 |
| 7 | C.V. Seat | 1 | HPDK-W4005 |
| 8 | Upper Valve Cap | 1 | See Sealkit |
| 9 | Valve Cap | 1 | HPDK-W4025 |
| 10 | Valve Cap O-Ring | 1 | See Sealkit |
| 11 | Wear Bushing | 1 | HPDK-W4024 |
| 12 | Valve | 1 | HPDK-W4007 |
| 13 | Valve Housing | 1 | HPDK-W4010 |
| 14 | Valve Housing Seal | 1 | See Sealkit |
| 15 | Valve Housing Seal | 1 | See Sealkit |
| 16 | Valve Housing Seal | 1 | See Sealkit |
| 17 | Valve Housing Seal | 1 | See Sealkit |
| 18 | Inner Tube | 1 | HPDK-W4009 |
| 19 | Piston | 1 | HPDK-W4014 |
| 20 | Cylinder | 1 | HPDK-W4012 |
| 21 | Piston Bushing Seal OD | 1 | See Sealkit |
| 22 | Piston Bearing | 1 | HPDK-W4021 |
| 23 | Piston Bushing Seal ID | 1 | See Sealkit |
| 24 | Piston Bushing Seal ID | 1 | See Sealkit |
| 25 | Piston Bushing Seal ID | 1 | See Sealkit |
| 26 | Piston Bushing Seal ID | 1 | See Sealkit |
| 27 | Piston Bushing Seal ID | 1 | See Sealkit |
| 28 | Piston Bushing Seal ID | 1 | See Sealkit |
| 29 | Wear Sleeve | 1 | HPDK-W4001 |
| 30 | Bit Bearing | 1 | HPDK-W4020 |
| 31 | Bit Ret. Ring | 1 | HPDK-W4018 |
| 32 | Bit Ret. O-Ring | 1 | See Sealkit |
| 33 | Drive Sub | 1 | HPDK-W4022 |
| Sealkit (Items 2, 8, 10, 14-17, 21, 23-28, 32) | 1 | HPDK-W40SEALKIT | |
| Complete Hammer | 1 | HADK-W40I | |
| Top Sub | 2-3/8″ API REG PIN |
| OAL (in / mm) | 48.5 / 1232 |
| OD Range (in / mm) | 4.37 / 111 |
| Weight w/o Bit (lbs / kg) | 129 / 59 |
| Piston Weight (lbs / kg) | 18 / 8.2 |
| Working Pressure (PSI / Bar) | 900-2450 / 62-169 |
| Application Bit (in / mm) | 4.5-5 / 114-127 |
| Feed Force (FT-lbs / M-Kg) | 1850-4600 / 256-636 |
| Rotation Speed (RPM) | 50-85 |
| Rotation Torque (FT-lbs / M-Kg) | 750-1500 / 104-207 |
| Frequency (blows / min) | 3870 |
| PSI | Min | Max |
|---|---|---|
| New (Gal/Min) | 35 | 60 |
| Worn (Gal/Min) | 65 | 100 |
Exploded View — HADK-W40I (WAI IR340)
