Hertel C.E11.0556 Extra Length Drill Bit 0.2188 in Hss

Product Description

The HERTEL C.E11.0556 is an extra length high-speed steel drill bit designed for deep-hole drilling applications that standard length bits cannot reach. It features a 0.2188 inch diameter cutting edge with a 118-degree split point angle for accurate starting and reduced walking on entry. The 12-inch flute length handles chip evacuation through extended cuts, while the full 18-inch overall length gives reach into deep cavities, structural members, or through stacked material. An oxide finish reduces friction and provides mild corrosion resistance during use. This bit is a general-purpose grade suited for drilling into mild steel, aluminum, wood, and similar materials.

This extra length drill bit is used across mechanical, HVAC, plumbing, and electrical trades wherever standard jobber-length bits fall short. Typical applications include drilling through wall studs, joists, or deep flanges when routing conduit, pipe, or ductwork. Electricians and plumbers frequently reach for extended bits when fishing lines through framing bays or thick structural sections. The 0.2188 inch diameter corresponds closely to a 7/32 inch or number-equivalent bore size commonly needed for anchors, fasteners, and pilot holes in light fabrication work.

Key Features

• 0.2188 inch cutting diameter suitable for close-tolerance bore work in general-purpose materials
• 18-inch overall length provides extended reach beyond standard jobber bits
• 12-inch flute length promotes chip clearing in deep drilling operations
• 118-degree point angle for positive engagement and self-starting entry
• High-speed steel construction maintains edge hardness during extended use
• Oxide finish reduces friction and provides light surface protection
• Two-flute design balances material removal with rigidity in an extra length profile

Compatibility

Designed as a general-purpose extra length drill bit compatible with standard three-jaw drill chucks and magnetic drill press setups accepting 0.2188 inch shank diameters.

Installation Notes

This bit is installed and operated by machinists, mechanical contractors, electricians, and plumbers using corded or cordless drills and drill presses. Secure the workpiece before drilling and use appropriate cutting fluid when drilling into steel to extend bit life and control heat. Extra length bits are more susceptible to deflection than jobber-length bits - use a center punch or pilot hole to maintain positional accuracy. Inspect the cutting edges before each use and replace immediately if chipping or excessive wear is observed.