RMT NAS Grade HSS Stub Drill Black Oxide 135°.Manufactured at the foot of the Rocky’s in Montana USA, Rocky Mountains heavy duty JH501 Black Oxide Finish HSS stub drill bits feature a 135° split point. A split point drill penetrates the work surface on contact. The split point also self-centres, with both properties helping stop the drill from walking and minimising the need for an initial spotting operation.
Black oxide drill surfaces are treated with enhanced corrosion resistance and increased lubricity. Rocky Mountain drill flutes are precision ground using the latest CNC technology for faster and more efficient swarf and chip removal. Ground precisely to tight quality standards, the flutes deliver superior cutting performance and accuracy. Like all RMT drill bits, these black oxide stub drill bits are manufactured from industrial grade NAS (National Aerospace Standard) High Speed Steel.
Material ApplicationCast Iron, Alloy Steels
SizesImperial diameters; including fractional drill sizes from 1/16” (.0625) to ½” (.5000), wire drill sizes from #1 (.2280) to #60 (.0400) and letter drill sizes from A (.2340) to Z (.4130).