Milwaukee 48-89-2775 x Black O...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$15.97
Milwaukee 48-89-2775 x Black Oxide Aircraft-Length Drill Bit

Milwaukee 48-89-2775 x Black Oxide Aircraft-Length Drill Bit

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Model: 48-89-2771

In Stock (leaves warehouse same day if ordered before 3pm ET)

$15.97
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Milwaukee 48-89-2775 7/16" x 12" Black Oxide Aircraft-Length Drill Bit

The Milwaukee 48-89-2775 is a 7/16" x 12" aircraft-length drill bit finished in black oxide, built for extended-reach drilling where a standard-length bit simply cannot reach. Aircraft-length bits get their name from their traditional use in aircraft manufacturing and maintenance, where technicians need to bore accurate holes deep into airframe structures, wing spars, and other thick assemblies. At 12" overall, this Milwaukee bit gives tradespeople the same long-reach capability for drilling through thick lumber, wall cavities, engine bays, HVAC chases, and other hard-to-access work areas. The 7/16" diameter delivers a consistent, repeatable hole size for applications that demand dimensional accuracy, and the black oxide finish helps the bit resist heat buildup and corrosion over repeated use. This combination of length, diameter, and finish makes the 48-89-2775 a dependable choice for professionals who need a longer, extended-reach bit that still delivers precise, repeatable results.

Key Features

  • Trade Size: 7/16" diameter provides precise, consistent hole sizing for drilling tasks that require dimensional accuracy.
  • Aircraft Length: 12" overall length gives the reach needed to drill through thick stock, wall cavities, engine compartments, and other deep or hard-to-access work areas where standard-length bits fall short.
  • Black Oxide Finish: The black oxide coating creates a durable, low-friction surface that helps dissipate heat and resist corrosion, extending the working life of the bit compared to uncoated steel.
  • Color: Finished in black for easy visual identification when sorting through a mixed set of bits.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Extended-Reach Drilling Applications in Deep or Confined Spaces
  • Deep Hole Drilling Through Metal, Wood, or Plastic Stock
  • Automotive, HVAC, and Mechanical Installation Work
  • Wall Cavity and Framing Penetrations Requiring Extra Reach
  • Access-Limited or Hard-to-Reach Job Sites

Why Milwaukee?

Milwaukee designs the 48-89-2775 aircraft-length drill bit with a black oxide finish to stand up to the demands of professional trade work, giving users the extended 12" reach and 7/16" precision needed to get tough drilling jobs done in a single pass. Whether working through thick framing, engine bays, or other hard-to-reach spaces, this bit is built to deliver dependable, repeatable performance that tradespeople can count on. Backed by Milwaukee's reputation for durable, trade-tested tooling, the 48-89-2775 is designed to hold up under the demands of daily use on the jobsite, making it a smart addition to any professional's drill bit set.

Manufacturer Resources

Product Specs

Product Type:
Twist Drill Bit
Product Finish:
Black Oxide
Department:
Electrical
Product Subgroup:
Drill & Driver Bits
list_batch:
MWK-20260918
Product Color:
Black
Product Group:
Power Tools & Accessories
Product Length:
12 in
Series:
Milwaukee® S&D Black Oxide Aircraft drill bits

Milwaukee 48-89-2771 – Frequently Asked Questions

1) What diameters do Milwaukee aircraft-length black oxide drill bits come in?
Milwaukee's 12-inch aircraft-length black oxide bits run in seven diameters: 1/8 inch (48-89-2770), 3/16 inch (48-89-2771), 1/4 inch (48-89-2772), 5/16 inch (48-89-2773), 3/8 inch (48-89-2774), 7/16 inch (48-89-2775) and 1/2 inch (48-89-2776). Every one of them is 12 inches overall, so the only thing changing between part numbers is hole size.
2) Will a 12-inch aircraft-length bit reach through a stud bay or a double top plate?
Yes. At 12 inches overall the bit has far more reach than a standard jobber bit, which is the whole point of the aircraft length. For an electrician running cable, that is enough to pass through a 2x4 wall cavity, bore a double top plate from an awkward angle, or get into an HVAC chase without pulling the drill back and resetting. Keep in mind the 12 inches is total length, so usable depth is less once the shank is in the chuck.
3) Can I use these black oxide aircraft bits in steel, or are they for wood only?
They work in metal, wood and plastic. The black oxide finish is a low-friction coating that helps shed heat and resist corrosion, which is what lets the bit hold up in metal rather than just timber. Typical use runs from deep holes in thick lumber and framing to engine bay and mechanical work.
4) What size Milwaukee aircraft bit do I need for 1/2 inch EMT connectors or a 1/2 inch anchor?
Pick the bit by the hole you need, not the conduit trade size. The range tops out at 1/2 inch (48-89-2775 is the 7/16 inch, 48-89-2776 the 1/2 inch), so anything requiring a hole larger than 1/2 inch needs a different tool, such as a hole saw or step bit. For clearance holes where you want a little slip, the 7/16 and 1/2 inch sizes are the two largest in the family.
5) How is an aircraft-length drill bit different from a standard jobber or an auger bit?
Aircraft length means an extended overall length, 12 inches here, for boring deep into thick assemblies or reaching into spots a standard-length bit cannot get to. A jobber bit is much shorter and stiffer, better for accuracy in open work. An auger or ship auger is a wood-only design with an aggressive screw point; these Milwaukee bits are twist bits that will cut metal and plastic as well as wood. If you only drill wood framing, an auger clears chips faster; if you mix materials, the aircraft-length twist bit is the one that covers both.
6) Is a Lenox 12111-10DGHS diamond grit bit a substitute for a 7/16 inch aircraft-length black oxide bit?
No. The Lenox 12111-10DGHS is a 5/8 inch diamond grit drill bit in the D/S-10Dg series, a grit-edge bit sized at 5/8 inch rather than a fluted twist bit. Milwaukee's 48-89-2775 is a 7/16 inch black oxide aircraft-length twist bit with a 12 inch overall length for extended-reach drilling in wood, metal, and plastic. Different diameter, different cutting edge, and no long-reach capability, so the two are not interchangeable.
7) If 7/16 inch is larger than the hole I need, what other aircraft-length black oxide sizes are there?
The same 12 inch aircraft-length black oxide bit runs in 1/8, 3/16, 1/4, 5/16, 3/8, 7/16, and 1/2 inch diameters, under Milwaukee part numbers 48-89-2770 through 48-89-2776. Stepping down to 48-89-2774 gives you 3/8 inch x 12 inch with the identical reach and black oxide finish, and 48-89-2776 steps up to 1/2 inch x 12 inch if you need a larger hole in the same long-reach format.
8) Are these Milwaukee aircraft bits sold individually or as a set?
Each diameter is its own part number, from 48-89-2770 at 1/8 inch through 48-89-2776 at 1/2 inch, so you order the size you need. Facilities crews standardizing a cart usually take the full spread of seven; a contractor replacing one burned bit just orders that one number.
9) Why are these bits black, and does the color mean anything?
The black comes from the black oxide finish itself, not paint. Beyond the look, the coating cuts friction, helps the bit shed heat and resists corrosion in a damp truck box. It also makes the bits easy to pick out of a mixed index of bright finish and titanium bits.
How fast can I get the Milwaukee 48-89-2771 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Milwaukee 48-89-2771 come with a warranty?
Absolutely. The Milwaukee 48-89-2771 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Milwaukee 48-89-2771?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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