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Cobra Carbide 55992 13.70 mm non-coolant drill bit, silver metal cylinder with fluted shaft and pointed tip

Cobra Carbide

Cobra Carbide 55992 3xD High Perf Non-Coolant Drill 13.70 mm

SKU CH-H6CE-FEAQQ

3xD high-performance non-coolant drill bit sized at 13.70 mm for efficient dry drilling

  • 3xD length reaches deeper holes without pecking
  • Non-coolant design cuts setup time on dry machines
  • 70 mm diameter matches metric tap charts exactly
  • Cobra Carbide grade resists wear in tough alloys
  • New condition delivers full factory edge life

3xD Non-Coolant Drill 13.70 mm

The Cobra Carbide 55992 is a solid-carbide drill bit designed for high-performance drilling at three times the diameter depth. It targets machinists and maintenance technicians who need precise holes in steel, cast iron and non-ferrous alloys without through-tool coolant delivery. The 13.70 mm cutting diameter suits a range of general-purpose and production applications.

Heat and wear without coolant

Operating without internal coolant channels, the bit relies on its flute geometry and carbide substrate to evacuate chips and manage temperature during normal cutting cycles. The design reduces friction at the cutting lips, helping to limit heat build-up in the workpiece and the tool body. Power draw on the machine spindle remains consistent with standard feeds for this diameter.

Sustained drilling at 3xD depth

At full 3xD engagement the flutes maintain chip evacuation over the longer hole length, preventing packing that can spike torque or break the tool. The carbide grade holds edge integrity through extended cuts, so hole diameter and surface finish stay within tolerance from entry to bottom. The bit is suited for uninterrupted production runs where coolant supply is unavailable or undesirable.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $154.99
Pricier than about 90% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCOBRA CARBIDE

Questions about this item

How do I install the 55992 drill bit and what step is often missed?

Clamp the 13.70 mm shank securely in a matching collet or chuck, then verify true running with a dial indicator before cutting; the step most often missed is checking run-out, which causes premature wear.

What maintenance or replacement will the 55992 need over time?

The solid-carbide cutting edges cannot be resharpened on-site; once the 13.70 mm diameter wears beyond tolerance, the entire drill must be replaced.

What limit appears first on the 55992 during sustained drilling?

Without through-coolant, heat builds quickly in deep holes; the 3xD flute length restricts chip evacuation, so thermal softening of the carbide edge becomes the first limiting factor.

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