Drilling, tapping, milling, and broaching

No matter the application, we can get it done.

Dunham Products continues its tradition of strength with drilling, tapping, milling, and broaching for bolts, studs, rods, and fasteners. We have the expertise and capacity for high volume production drilling with hole diameters from .020 to .750 up to 6.00 deep in a variety of fasteners, as well as headed, turned, bent and cast parts.


With drilled fasteners, safety wire (or lockwire) can be used as a positive locking device that prevents fasteners from coming loose due to vibration and other forces. Typically, the wire is threaded through a hole drilled into a fastener and secures together two or more fasteners.

Dunham Products also can handle through, blind, cross, core, pointed and flat bottom drilling with automatic feeders with flow and depth testing. Dunham Products can drill hole diameters .020 thru .750 up to 6.00 deep.


Tapping is the process of producing internal threads using a tool (tap) that has teeth on its periphery to cut threads in a predrilled hole. A combined rotary and axial motion between the tap and component forms the internal threads. Dunham Products helps with advanced tapping methods and machinery.


Milling is a material removal process which can create a variety of features on a part by cutting away unwanted material.

Dunham Products uses milling to produce parts that are not axially symmetric and have many features, such as pockets, holes, slots, and surface contours. Milling can create custom designed prototypes, and is also frequently used as a secondary process to add or refine features on parts previously manufactured, perhaps using an entirely different process. 


Broaching uses a toothed tool, called a broach, to remove material, and is used when precision is required, especially for unusual or irregular shapes. We can broach circular and non-round holes, keyways, splines, as well as flat surfaces on small and medium sized castings, forgings, and screw machine parts.

Dunham Products would love to hear about your next project! If you have a project or challenge, we’ll help you get it done!