The World's Leaders in Rock Drilling Equipment

Patriot, Champion and Challenger Hammers
Made in the USA

Down The Hole Hammers, DTH Hammers and DTH Bits

Numa is the world’s leading designer, manufacturer, and US provider of drilling equipment with the best rock drilling hammers and horizontal drilling equipment for drilling holes from 3½ – 50½ inches (89 – 1283mm) in diameter

Down The Hole Hammers

Down the hole hammers, usually called DTH hammers, is basically a mini jackhammer screwed on the bottom of drill strings. The fast hammer action breaks hard rock into small flakes and dust and is blown clear by the air exhaust from the DTH hammer bits. DTH drills are one of the fastest ways to drill hard rock. It was only when down the hole hammers came along that many of the problems associated with the other systems were overcome – with the DTH system and dth drilling tools, the energy source is constantly behind the drill bit with copious amounts of air passed through the drill string to operate the DTH Hammer which is then used to efficiently flush the bore hole clean.

Numa DTH products and down the hole drills are designed to drill holes in hard rock, overburden, or loose strata formations in many different types of drilling applications. These markets are commonly found in the construction, oil & gas, mining, quarry, geothermal, water well, horizontal and other rock drilling industries. Operators of DTH products and rock drilling equipment drill holes from a few feet to 1000’s of feet deep. In fact, one of the deepest holes on record was drilled to 17,600 feet (5364 m) below the surface. If you are interested in our DTH Hammers, DTH bits, or other products, contact us today.

Our commitment gives our customers the peace of mind that we’ll always be the DTH manufacturer leader in rock drilling equipment with the industry’s best performing, most reliable DTH rock drilling products and the industry’s best service and support.

  • horizontal directional drilling
    Precision Engineering

    Numa offers one of the largest ranges of down the hole hammers, made in USA drills, large diameter drills, DTH drill bits, large diameter bits, hammer bits, and best rock drilling bits available in the drilling industry today. You can be sure when looking at drilling manufacturers that we have the best DTH hammer and drilling tools to meet your construction drilling needs with the best rock drilling bits.

  • horizontal drilling
    Exceptional Customer Support

    With a dedicated field staff traveling to drill sites around the world, an expert sales team, and in-house engineers, we are the best DTH manufacturer capable of delivering your exact DTH drilling tool and quality DTH products–anywhere in the world to fit your horizontal drilling, horizontal directional drilling, or drilling and casing at same time needs.

  • Best DTH Hammer
    Innovative Solutions

    Numa consistently conducts research and development in order to improve DTH drilling system technologies for the future. We are US makers of the best dth bits and drilling equipment that continue to be instrumental in the development of new technology.

The Best Horizontal Directional Drilling Tools for Your Needs

Horizontal Directional Drilling (HDD) is a method of installing underground pipelines, cables and service conduit through trenchless methods. Our horizontal directional drilling tools are a good fit when you installing infrastructure such as telecommunications and power cable conduits, water lines, sewer lines, gas lines, oil lines, product pipelines, and environmental remediation casings. Our tools are used when crossing waterways, roadways, shore approaches, congested areas, environmentally sensitive areas, and areas where other methods are costlier or not possible.

The equipment used in horizontal drilling depends on the outer diameter of the pipe, length of the run, ground conditions and the surroundings above ground. Horizontal directional drilling is done with the help of a viscous fluid known as drilling fluid. a mixture of water and, usually, bentonite or polymer continuously pumped to the cutting head or drill bit to facilitate the removal of cuttings, stabilize the bore hole, cool the cutting head, and lubricate the passage of the product pipe.

  • The first stage consists of drilling a small diameter pilot hole. Drilling fluid is pumped through the drill pipe to the drill bit where high pressure jets and the bit will grind the soils ahead of the drill stem.
  • The second step is to pre-ream the pilot hole and enlarge it to a size sufficient to safely install the product lines.
  • The final step is the pullback of the pipe within the pre-reamed hole. The drill rod and reamer will be attached to a swivel, which is utilized between the product line and the reamer to prevent any torsional stress from the rotating drill string being transferred to the product pipe.

All Numa HDD hammers are constructed Made in the USA, premium steel allowing drillers to use our products longer than competing brands. Furthermore, the single bore design allows for a maximum bore diameter in conjunction with optimum life against abrasion. Quite simply, the Numa HDD product line provides performance and dependability without sacrificing tool life.

Numa Technology Around the Globe

See Us in Action

With nearly half of our sales overseas, Numa products are at work on every continent and tough job site there is.


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