Norseman Hole Hog Bits Optimize Heavyduty Drilling Performance

Norseman's Type 134-AG "Hole Hog" line of four-flute super premium core drills is engineered for large-diameter holemaking in heavy metalworking and precision drilling, where tool choice bears directly on throughput and hole quality. The series combines a rigid four-flute geometry with a premium-grade build intended for demanding industrial environments. The specifications below outline the six currently available diameters, from 3/8 inch to 3/4 inch, along with list pricing.

The 134-AG series uses a four-flute design that increases the cross-sectional area of the tool body, raising rigidity during cuts that place substantial load on the drill. That added stiffness helps stabilize the tool as it advances through the workpiece, reducing vibration and yielding a more consistent hole diameter and a smoother bore wall.

Norseman classifies the line as Super Premium, a designation aimed at high-intensity operating conditions rather than general-purpose shop work. The drills are positioned for core-hole drilling in industrial manufacturing and maintenance operations, where interrupted cuts, deep bores and repeated cycling place a premium on tool life.

Flute count also affects chip evacuation. The four-flute configuration is intended to clear chips efficiently from large-diameter bores, limiting the recutting and heat buildup that can shorten tool life in extended drilling runs.

Six sizes are listed, spanning 3/8 inch through 3/4 inch in sixteenth-inch increments except for the 9/16 inch and 11/16 inch steps, which round out the mid-range. Pricing rises with diameter, from $24.21 at the smallest size to $55.02 at the largest.

Because the range covers only a defined band of diameters, buyers should confirm that the required bore matches one of the six listed models rather than assuming intermediate sizes are available. Diameter selection should also take into account the power and torque limits of the drilling equipment, as well as the hardness of the material being machined.

Matching the drill to the machine and the workpiece is the central factor in achieving expected tool life and dimensional accuracy. A diameter that exceeds the torque capacity of the spindle or drill press can lead to stalling, chatter or premature wear, while an undersized choice fails to meet drawing requirements.

Shank and fixture compatibility should be verified before a tool is placed in service, since the holding method affects runout and, in turn, hole quality. When the 134-AG series is applied to extremely hard steels or specialty alloys, controlled feed rates and appropriate coolant are advisable to extend service life.