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 high-speed steel aircraft extension drill bit, 135-degree split point, black oxide finish

Chicago-Latrobe

Chicago-Latrobe 11018 135 Degree NAS-Type Aircraft Extension Drill 5/16 in

SKU CH-549A-NA5AC

Aircraft extension drill with a 135-degree split point, high-speed steel and black oxide finish for deep-hole precision

  • 135-degree split point starts holes cleanly on contact
  • High-speed steel construction resists wear during repetitive drilling
  • Black oxide finish reduces friction and chip welding
  • 28-degree helix angle clears chips efficiently from deep holes
  • 3 3/16 in maximum drilling depth reaches confined workpieces

Chicago-Latrobe 11018 Aircraft Extension Drill

The Chicago-Latrobe 11018 is a 5/16 inch NAS-type aircraft extension drill made from high-speed steel with a black oxide finish. It features a 135-degree split point for accurate starting and reduced thrust. The tool is designed for deep-hole drilling applications in aviation maintenance and precision metalworking where extended reach is required.

Suited for aviation technicians and metalworkers

This drill suits professionals drilling deep holes in tough materials who need the rigidity and chip clearance of a 4xD design with a 28-degree helix angle. It is not for buyers who need a standard jobber-length bit for shallow holes or a carbide-tipped tool for abrasive composites.

135-degree split point geometry

The 135-degree split point is the critical specification that enables self-centering on curved or hard surfaces without a pilot hole. This geometry reduces walking and lowers the force needed to penetrate high-strength alloys common in aircraft structures.

How it compares

Measured against everything we stock in Power Drills, Drivers & Cutting Bits, at today’s prices. Recalculated every night.

Price $15.99
Cheaper than about 88% of the 2,412 comparable items (median $81.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

What does the 135-degree split point do for drilling?

The 135-degree split point reduces walking and provides faster penetration in metal without a centre punch.

What shank size fits my drill chuck?

The 5/16 inch fractional shank fits standard three-jaw chucks that accept that diameter.

How deep can I drill in one pass?

Maximum drilling depth is 3 3/16 inches, so clear chips before reaching that limit.

More in Power Drills, Drivers & Cutting Bits

Similar items