We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver cobalt steel aircraft extension drill bit 3/16 inch diameter 12 inches long

Drill America

Drill America Cobalt Aircraft Extension Drill Bit 3/16in x 12in

SKU CH-40TK-542ZM

Cobalt steel aircraft extension bit drills 3/16 inch holes at 12 inch reach with split-point precision

  • Product typeDrill Accessories
  • 3/16-inch cobalt bit drills hard alloys with heat-resistant steel
  • Split-point tip starts on contact without centre-punching
  • 12-inch overall length reaches deep or confined holes
  • 1875-inch decimal size matches precise engineering specs

3/16in 12in Cobalt Aircraft Extension Bit

This cobalt aircraft extension drill bit measures 3/16in in diameter with a 12in overall length and a flute length of 2-5/16in. It is made from cobalt steel and features a heavy-duty split point for accurate starting. The decimal equivalent of the size is .1875.

Suited for deep-hole drilling in tough metals

The extended length and cobalt construction suit users drilling deep holes in stainless steel, titanium and other hard alloys where heat resistance matters. Builders who need a shorter bit for confined spaces or a different diameter for other hole sizes should look at other options.

How it compares

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

Price $8.99
Cheaper than about 90% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Product typeDrill Accessories

Questions about this item

How does the .1875 decimal size translate when the bit is in a real machine?

The .1875 decimal equivalent matches a standard 3/16 inch drill chuck, so the bit seats securely in any drill that accepts that shaft diameter.

What does the 12 inch overall length cap in practice when drilling deep holes?

The 12 inch overall length allows reach into deep cavities, while the 2-5/16 flute length limits the continuous chip clearance depth per plunge.

More in Bits, Hole Saws & Accessory Kits

Similar items