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Long silver drill bit with black oxide finish, 12 inches overall length

Westward

Westward 5TVL3 Aircraft Extension Drill 3/8 in 12 in HSS Black Oxide 135° Split Point

SKU CH-NWEQ-FNFA0 MPN 5TVL3

High-speed steel drill bit with 135-degree split point and black oxide finish for deep-hole drilling

  • Product typeDrill Accessories
  • Main materialHigh speed steel
  • 12-inch reach accesses deep cavities
  • 135-degree split point starts holes cleanly
  • High-speed steel resists heat during drilling
  • Black oxide finish reduces friction and wear
  • 3/8-inch diameter suits standard chucks

Aircraft Extension Drill 3/8 in 12 in

The Westward 5TVL3 is a high-speed steel aircraft extension drill with a 3/8 inch diameter and 12 inch overall length. Its 135 degree split point reduces walking and starts holes cleanly. The black oxide finish adds corrosion resistance and helps retain lubricant. It is built for deep-hole drilling in metal and composite structures.

Mechanics and fabricators needing reach

This bit suits technicians who need to drill through bulkheads, spars or other deep workpieces where a standard jobber drill cannot reach. The fractional inch sizing matches common aerospace fastener holes. Shops that only drill shallow holes in thin sheet metal will not need the extra length and should choose a shorter bit.

Black oxide HSS under sustained load

The high-speed steel body with black oxide coating resists heat buildup during extended drilling cycles. The 135 degree split point maintains centering even when the bit flexes at depth. Chip evacuation remains steady because the flute geometry is designed for 4xD material removal. The cutting edges stay sharp longer in tough alloys.

How it compares

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

Price $12.99
Cheaper than about 82% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWestward
Model name5TVL3
Product typeDrill Accessories
Size & build
Main materialHigh speed steel

Questions about this item

What chuck size is needed to hold the 3/8 in shank on this drill bit?

A 3/8 in or larger drill chuck is required to grip the 3/8 in shank of this aircraft extension drill.

Will the 12 in overall length reach through the same deep holes as my shorter jobber bits?

The 12 in overall length provides extended reach for deep-hole drilling where standard jobber bits cannot reach.

How can I confirm the 135 degree split point is centring correctly on first contact?

The split point should self-centre on contact without wandering, producing a clean entry hole with minimal pressure.

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