5-Inch DTH Hammers
Drill King’s 5-inch DTH hammer lineup delivers high-frequency impact and dependable penetration for demanding construction, water well, blast-hole, and geotechnical applications. Available in three shank styles — A50I, A50Q and A50S along with two heavy-duty variants — A50IHD and A50QHD. Each is built on the same reliable platform with premium alloys.
Bit Range
5″–6¼″
(127–159 mm)
Impact Frequency
1,540 bpm
Working Pressure
150–350 PSI
SHANK SUPPORT
IR350, QL50, SD5
Why Drill King?
Heavy-Duty Options
H.D. variants of the IR350 and QL50 add reinforced top subs and wear sleeves for extended service life in abrasive formations.
Custom Bits
Whether it’s a new gage diameter, face profile, button layout, or something else entirely, Drill King provides quick turnaround custom bits.
Shank Flexibility
IR340, QL4, and SD4 — cover the most common shanks ensuring compatibility with existing equipment
Maximized Uptime
All Drill King hammers support field servicing through our repair and rebuild kits, so the hammer never leaves the jobsite.
High-Impact Frequency
At 1,540 blows per minute, our A50 hammers deliver consistent energy transfer to the bit for faster penetration in hard rock.
Extended Component Life
Premium alloys 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- A50I
Drill King’s 5″ air hammer with IR350-style shank. Built for high penetration rates, efficiency, and durability across a variety of applications.
Top Sub Connection
3-1/2 API REG PIN
Eff. Length
43.75 in / 1111 mm
OD
4.76 in / 121 mm
Hammer Weight
137 lbs / 62.1 kg
| No | Part Name | Qty | Part Number |
|---|---|---|---|
| 1 | Top Sub | 1 | HPDK-A5002 |
| 2 | Top Sub O-Ring | 1 | HPDK-A5003 |
| 3 | Choke Set | 1 | HPDK-A5008 |
| 4 | Check Valve | 1 | HPDK-A5007 |
| 5 | C.V. Spring | 1 | HPDK-A5009 |
| 6 | Spring Washer | 1 | HPDK-A5005 |
| 7 | Make Up Ring | 1 | HPDK-A5006 |
| 8 | Air Distributor | 1 | HPDK-A5010 |
| 9 | Air Dis. O-Ring | 1 | HPDK-A5011 |
| 10 | Cylinder | 1 | HPDK-A5012 |
| 11 | Piston | 1 | HPDK-A5014 |
| 12 | Wear Sleeve | 1 | HPDK-A5001 |
| 13 | Snap Ring | 2 | HPDK-A5021 |
| 14 | Bit Bearing | 1 | HPDK-A5020 |
| 15 | Bit Ret. Ring | 1 | HPDK-A5018 |
| 16 | Bit Ret. Ring O-Ring | 1 | HPDK-A5019 |
| 17 | Drive Sub | 1 | HPDK-A5022 |
| Complete Hammer | 1 | HADK-A50I | |
| Sealkit (Items 2, 9, 16) | 1 | HADK-A50SEALKIT | |
| Top Sub Connection | 3-1/2 API REG PIN |
| Eff. Length (in / mm) | 43.75 / 1111 |
| OD (in / mm) | 4.76 / 121 |
| Hammer Weight (lbs / kg) | 137 / 62.1 |
| Piston Weight (lbs / kg) | 25 / 11.3 |
| Working Pressure (PSI / Bar) | 150-350 / 10.3-24.1 |
| Application Bit (in / mm) | 5-6 / 127-152 |
| Rotation Speed (RPM) | 15-40 |
| Make-Up Torque (lb·Ft / N·m) | 4500 / 6100 |
| Rotation Torque (lb·Ft / N·m) | 725 / 983 |
| Frequency (blows / min) | 1540 |
Exploded View — A50I (IR350)
HPDK- A50IHD
Drill King’s 5″ air hammer with IR350-style shank and reinforced external components. Built for high penetration rates and extra durability in in abrasive applications.
Top Sub Connection
3-1/2 API REG PIN
Eff. Length
43.75 in / 1111 mm
OD
4.96 in / 126 mm
Hammer Weight
144 lbs / 65.3 kg
| No | Part Name | Qty | Part Number |
|---|---|---|---|
| 1 | Top Sub | 1 | HPDK-A5002-HD |
| 2 | Top Sub O-Ring | 1 | HPDK-A5003 |
| 3 | Choke Set | 1 | HPDK-A5008 |
| 4 | Check Valve | 1 | HPDK-A5007 |
| 5 | C.V. Spring | 1 | HPDK-A5009 |
| 6 | Spring Washer | 1 | HPDK-A5005 |
| 7 | Make Up Ring | 1 | HPDK-A5006 |
| 8 | Air Distributor | 1 | HPDK-A5010 |
| 9 | Air Dis. O-Ring | 1 | HPDK-A5011 |
| 10 | Cylinder | 1 | HPDK-A5012 |
| 11 | Piston | 1 | HPDK-A5014 |
| 12 | Wear Sleeve | 1 | HPDK-A5001-HD |
| 13 | Snap Ring | 2 | HPDK-A5021 |
| 14 | Bit Bearing | 1 | HPDK-A5020 |
| 15 | Bit Ret. Ring | 1 | HPDK-A5018 |
| 16 | Bit Ret. Ring O-Ring | 1 | HPDK-A5019 |
| 17 | Drive Sub | 1 | HPDK-A5022-HD |
| Complete Hammer | 1 | HPDK-A50IHD | |
| Sealkit (Items 2, 9, 16) | 1 | HPDK-A50SEALKIT | |
| Top Sub Connection | 3-1/2 API REG PIN |
| Eff. Length (in / mm) | 43.75 / 1111 |
| OD (in / mm) | 4.96 / 126 |
| Hammer Weight (lbs / kg) | 144 / 65.3 |
| Piston Weight (lbs / kg) | 25 / 11.3 |
| Working Pressure (PSI / Bar) | 150-350 / 10.3-24.1 |
| Application Bit (in / mm) | 5-6 1/4 / 127-159 |
| Rotation Speed (RPM) | 15-40 |
| Make-Up Torque (lb·Ft / N·m) | 4500 / 6100 |
| Rotation Torque (lb·Ft / N·m) | 725 / 983 |
| Frequency (blows / min) | 1540 |
Exploded View — A50IHD (IR350 H.D.)
HPDK- A50Q
Drill King’s 5″ air hammer with QL50-style shank. Built for high penetration rates, efficiency, and durability across a variety of applications.
Top Sub Connection
3-1/2 API REG PIN
Eff. Length
42.78 in / 1087 mm
OD
4.76 in / 121 mm
Hammer Weight
137 lbs / 62.1 kg
| No | Part Name | Qty | Part Number |
|---|---|---|---|
| 1 | Top Sub | 1 | HPDK-A5002 |
| 2 | Top Sub O-Ring | 1 | HPDK-A5003 |
| 3 | Choke Set | 1 | HPDK-A5008 |
| 4 | Check Valve | 1 | HPDK-A5007 |
| 5 | C.V. Spring | 1 | HPDK-A5009 |
| 6 | Spring Washer | 1 | HPDK-A5005 |
| 7 | Make Up Ring | 1 | HPDK-A5006 |
| 8 | Air Distributor | 1 | HPDK-A5010 |
| 9 | Air Dis. O-Ring | 1 | HPDK-A5011 |
| 10 | Cylinder | 1 | HPDK-A5012 |
| 11 | Piston | 1 | HPDK-A5014-Q |
| 12 | Wear Sleeve | 1 | HPDK-A5001-Q |
| 13 | Snap Ring | 2 | HPDK-A5021 |
| 14 | Bit Bearing | 1 | HPDK-A5020-Q |
| 15 | Bit Ret. Ring | 1 | HPDK-A5018-Q |
| 16 | Bit Ret. Ring O-Ring | 1 | HPDK-A5019 |
| 17 | Drive Sub | 1 | HPDK-A5022-Q |
| Complete Hammer | 1 | HPDK-A50Q | |
| Sealkit (Items 2, 9, 16) | 1 | HPDK-A50SEALKIT | |
| Top Sub Connection | 3-1/2 API REG PIN |
| Eff. Length (in / mm) | 42.78 / 1087 |
| OD (in / mm) | 4.76 / 121 |
| Hammer Weight (lbs / kg) | 137 / 62.1 |
| Piston Weight (lbs / kg) | 25 / 11.3 |
| Working Pressure (PSI / Bar) | 150-350 / 10.3-24.1 |
| Application Bit (in / mm) | 5-6 / 127-152 |
| Rotation Speed (RPM) | 15-40 |
| Make-Up Torque (lb·Ft / N·m) | 4500 / 6100 |
| Rotation Torque (lb·Ft / N·m) | 725 / 983 |
| Frequency (blows / min) | 1540 |
Exploded View — A50Q (QL50)
HPDK- A50QHD
Drill King’s 5″ air hammer with QL50-style shank and reinforced external components. Built for high penetration rates and extra durability in in abrasive applications.
Top Sub Connection
3-1/2 API REG PIN
Eff. Length
42.78 in / 1087 mm
OD
5 in / 121 mm
Hammer Weight
165 lbs / 74.8 kg
| No | Part Name | Qty | Part Number |
|---|---|---|---|
| 1 | Top Sub | 1 | HPDK-A5002-QHD |
| 2 | Top Sub O-Ring | 1 | HPDK-A5003 |
| 3 | Choke Set | 1 | HPDK-A5008 |
| 4 | Check Valve | 1 | HPDK-A5007 |
| 5 | C.V. Spring | 1 | HPDK-A5009 |
| 6 | Spring Washer | 1 | HPDK-A5005 |
| 7 | Make Up Ring | 1 | HPDK-A5006 |
| 8 | Air Distributor | 1 | HPDK-A5010 |
| 9 | Air Dis. O-Ring | 1 | HPDK-A5011 |
| 10 | Cylinder | 1 | HPDK-A5012 |
| 11 | Piston | 1 | HPDK-A5014-Q |
| 12 | Wear Sleeve | 1 | HPDK-A5001-QHD |
| 13 | Snap Ring | 2 | HPDK-A5021 |
| 14 | Bit Bearing | 1 | HPDK-A5020-Q |
| 15 | Bit Ret. Ring | 1 | HPDK-A5018-Q |
| 16 | Bit Ret. Ring O-Ring | 1 | HPDK-A5019 |
| 17 | Drive Sub | 1 | HPDK-A5022-QHD |
| Complete Hammer | 1 | HPDK-A50QHD | |
| Sealkit (Items 2, 9, 16) | 1 | HPDK-A50SEALKIT | |
| Top Sub Connection | 3-1/2 API REG PIN |
| Eff. Length (in / mm) | 42.78 / 1087 |
| OD (in / mm) | 5 / 121 |
| Hammer Weight (lbs / kg) | 165 / 74.8 |
| Piston Weight (lbs / kg) | 25 / 11.3 |
| Working Pressure (PSI / Bar) | 150-350 / 10.3-24.1 |
| Application Bit (in / mm) | 5-6 1/4 / 127-152 |
| Rotation Speed (RPM) | 15-40 |
| Make-Up Torque (lb·Ft / N·m) | 4500 / 6100 |
| Rotation Torque (lb·Ft / N·m) | 725 / 983 |
| Frequency (blows / min) | 1540 |
Exploded View — A50QHD (QL50 H.D.)
HPDK- A50S
Drill King’s 5″ air hammer with SD5-style shank. Built for high penetration rates, efficiency, and durability across a variety of applications.
Top Sub Connection
3-1/2 API REG PIN
Eff. Length
43.64 in / 1108.4 mm
OD
4.76 in / 121 mm
Hammer Weight
137 lbs / 62.1 kg
| No | Part Name | Qty | Part Number |
|---|---|---|---|
| 1 | Top Sub | 1 | HPDK-A5002 |
| 2 | Top Sub O-Ring | 1 | HPDK-A5003 |
| 3 | Choke Set | 2 | HPDK-A5008 |
| 4 | Check Valve | 1 | HPDK-A5007 |
| 5 | C.V. Spring | 1 | HPDK-A5009 |
| 6 | Spring Washer | 1 | HPDK-A5005 |
| 7 | Make Up Ring | 1 | HPDK-A5006 |
| 8 | Air Distributor | 1 | HPDK-A5010 |
| 9 | Air Dis. O-Ring | 1 | HPDK-A5011 |
| 10 | Cylinder | 1 | HPDK-A5012 |
| 11 | Piston | 1 | HPDK-A5014-S |
| 12 | Wear Sleeve | 1 | HPDK-A5001-S |
| 13 | Snap Ring | 1 | HPDK-A5021 |
| 14 | Bit Ret. Ring | 1 | HPDK-A5018-S |
| 15 | Bit Ret. Ring O-Ring | 1 | HPDK-A5019 |
| 16 | Bit Bearing | 1 | HPDK-A5020-S |
| 17 | Drive Sub | 1 | HPDK-A5022-S |
| Sealkit (Items 2, 9, 16) | 1 | HPDK-A50SEALKIT | |
| Complete Hammer | 1 | HPDK-A50S | |
| Top Sub Connection | 3-1/2 API REG PIN |
| Eff. Length (in / mm) | 43.64 / 1108.4 |
| OD (in / mm) | 4.76 / 121 |
| Hammer Weight (lbs / kg) | 137 / 62.1 |
| Piston Weight (lbs / kg) | 25 / 11.3 |
| Working Pressure (PSI / Bar) | 150-350 / 10.3-24.1 |
| Application Bit (in / mm) | 5-6 / 127-152 |
| Rotation Speed (RPM) | 15-40 |
| Make-Up Torque (lb·Ft / N·m) | 4500 / 6100 |
| Rotation Torque (lb·Ft / N·m) | 725 / 983 |
| Frequency (blows / min) | 1540 |
Exploded View — A50S (SD5)
