Kovai 6″ KH Series DTH Hammer is developed for intensive drilling environments, integrating refined internal engineering and long-stroke piston technology for consistent high-impact performance across mining and geothermal sectors.
Hammer OD
143 - 148 (mm)
5.6" - 5.8"
Bit size
152 - 203 (mm)
6" - 8"
Shank Types
Mission & QL
DTH Hammers
Our core piston design is optimized for longer stroke, higher impact, and durability. Using FEA simulations, we refine geometry to maximize efficiency and minimize wear. Backed by deep expertise and proven North American field performance, KDA builds next-generation drilling systems
14 Components
DTH Hammers
| Hammer Name | KH600M | KH600QL | KH650M CBH | KH650QL CBH |
|---|---|---|---|---|
| Suitable Shank Type | M60 | QL60 | M60 | QL60 |
| Outside Diameter | 143mm | 143mm | 148mm | 148mm |
| Hammer Length | 1056mm | 1092mm | 1056mm | 1092mm |
| Hammer Weight | 184lbs | 189lbs | 204lbs | 208lbs |
| Piston Weight | 40lbs | 45lbs | 40lbs | 45lbs |
| Bit Size Min | 152mm | 152mm | 158mm | 158mm |
| Bit Size Max | 190mm | 190mm | 203mm | 203mm |
| Backhead Thread | 3 1/2” API Reg Pin | 3 1/2” API Reg Pin | 31/2″ API Reg Pin | 31/2″ API Reg Pin |
| Footvalve | NO | NO | NO | NO |
| Catalogue |  Download | Download | Download | Download |
AIRFLOW GRAPH
Kovai DTH hammers combine high-impact piston technology with precision internal engineering to push drilling performance beyond what off-the-shelf solutions can offer.
DTH Hammers
Our Finite Element Analysis refined piston geometry maximizes stroke length and energy transfer to the bit. The result is higher impact force per cycle, faster penetration rates, and measurable reduction in time on hole even in hard, abrasive formations.
Every piston is engineered for precise stress distribution across contact zones, minimizing fatigue-induced failure. Tighter tolerancing and optimized mass distribution translate directly into longer service intervals and lower cost-per-meter.
Testimonials
The Kovai 6" class hammer performs excellently at all depths. In my 36 years of hard rock drilling experience, I feel it is quite possibly the fastest penetrating hammer on the market today!!
In the hard, abrasive iron ore at Mont-Wright Mine, the Kovai DTH hammer delivers excellent penetration with outstanding reliability. It handles tough conditions with ease and keeps our drilling efficient and consistent.
We tested Kovai DTH hammers against major brands in multiple quarries. They delivered strong penetration, reliable performance, and excellent service life in tough rock conditions. Based on their overall performance and durability, we adopted 5-inch and 6-inch Kovai hammers for our South Carolina drilling operations.
We recently had a multiwater well project near Pinnacles National Park, east of Soledad, CA. The lithology consisted of upper sandstone and decomposed granite followed by hard, weathered granitic rock. Prior to the Kovai hammer with 7.5" bit, we were averaging 140' per day with 6" button bits and drill collars and various other hammers. Once we switched to the Kovai hammer, our production increased to 120' per hour average. With auxiliary air, we were able to reach 660' on multiple holes that were producing in excess of 60 gallons per minute. We look forward to Kovai launching larger hammers and we appreciate their local distributorship and assistance
We've been using Kovai's 8-inch DTH hammer for the past two years, and it's performed very well in our water well drilling operations. It has delivered reliable performance while saving us money compared to some of the bigger brands. I'd definitely recommend giving Kovai a try if you're looking for quality and value