RMT BlackGold 135° Parabolic Heavy Duty Imperial Jobber Drill.The Rocky Mountain Twist BlackGold imperial sized parabolic flute drill bit is a heavy-duty performance cutting tool. The parabolic flute is specifically designed with a 32° high helix which enhances swarf lift and reduces chip turbulence. The RMT JH522-P series is an extremely robust parabolic drill with a heavy-duty web that improves strength and structural stability.
The drill features a 135° split point for improved accuracy and control. Split points also have an increased cutting edge which ensures instant cutting on contact with the workpiece.
The flatter web taper and parabolic high helix flute make the JH522-P a superior performer in deep hole drilling.
A precisely engineered drill bit, the BlackGold range allows for less torque and operator load. The ground split point penetrates the material surface on contact and prevents drill bit walking. Manufactured from Industrial-Grade National Aerospace Standard (NAS) High Speed Steel (HSS).
Rocky Mountain drill flutes are precision ground using the latest CNC technology at the foot of the Rocky’s in Montana. Ground precisely to tight quality standards, the flutes deliver superior cutting performance and accuracy.
Material ApplicationCarbon steels, alloy steels, stainless steels and strength alloys
SizesImperial drill diameters; including fractional drill sizes from 1/16” (.0625) to ½” (.5000), wire drill sizes from #10 (.1935) to #40 (.0980) and letter drill sizes from A (.2340) to Z (.4130).