American Heller's MBU Drills are used for Solid Drilling operations. Solid Drilling is a deep hole drilling process used when only one operation is desired to obtain the required bore diameter. Solid Drilling tools remove all the material from the bore in just one pass. Additionally due to the quality of the bore finish the majority of operations require no additional machining to 'clean up' the bore. MBU drills are ideal for very small holes (less than 1/2") and their carbide inserts can be resharpened when they are worn.

Consider these unique advantages of American Heller's Brazed Micro Drilling Heads (MBU)

• Tools sizes between .315-.582" are stocked for quick delivery
• Tools produced to an accuracy of ±.0005" on diameter resulting in closer tolerance holes
• Carbide inserts can be resharpened when they are worn
• Various grades available for drilling different materials
• 4 premium grades of coating for optimum tool life

General Information

American Heller's MBU drills are for use with the STS/BTA drilling system. For more information on the STS/BTA drilling system please refer to our Drilling Information Page . Additionally they have an external thread and chips are ID exhausted through the drilling bar/drill tube. The following table shows the different tool ranges and the standard drilling bar/drill tube that they are used with.

American Heller's MBU Drill Heads are available in a variety of different grades for drilling different materials. The table below shows the available grades and the part material that they should be used with. The TF grade is the default grade for American Heller's MBU Drills. Coatings are available upon request.