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
Twist drill bit, 7/32 inch, black oxide finish, 135 degree split point

Chicago-Latrobe

Chicago-Latrobe 40572 135 Degree NAS-Type Aircraft Extension Drill 7/32 in High Speed Steel Black Oxide

SKU CH-Z18S-JEB5B

A 135-degree split-point aircraft extension drill in 7/32-inch high-speed steel with black oxide finish

  • Product typeDrill Bits
  • Main materialHAWA
  • 135-degree split point starts holes cleanly on contact
  • High-speed steel construction resists wear during repetitive drilling
  • Black oxide finish reduces friction and heat buildup
  • 28-degree helix angle clears chips efficiently from deep holes
  • 7/8-inch maximum drilling depth reaches through thick workpieces

Chicago-Latrobe 40572 Extension Drill

This Chicago-Latrobe 40572 is a NAS-type aircraft extension drill made from high speed steel with a black oxide finish. It features a 135-degree split point and a 7/32 inch fractional size. The tool is designed for deep-hole drilling tasks where extended reach is necessary.

Suited for precision drilling in aviation

This drill suits machinists and maintenance technicians who need a 4xD reach and a 135-degree split point for accurate starting in tough materials. It is not for buyers who need a standard jobber-length bit or a different point angle for general-purpose work. Shops requiring carbide or cobalt substrates should look elsewhere.

135-degree split point angle

The 135-degree split point is the critical specification that determines if this bit matches the required hole geometry and material hardness. Verify that your application calls for this specific angle and a maximum drilling depth of 7/8 in before purchasing.

How it compares

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

Price $6.99
Cheaper than about 92% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits
Size & build
Main materialHAWA

Questions about this item

Will the 135-degree split point on the 7/32-inch drill bit start cleanly in existing rivet holes without a centre punch?

The 135-degree split point is designed to self-centre and reduce walking, so it should engage existing rivet holes cleanly without a separate centre punch.

How can I verify the black-oxide coating is intact and the split point is sharp after first use?

Inspect the flute and tip under good light; the black-oxide finish should appear uniform with no bare steel showing, and the two cutting lips of the 135-degree split point should meet cleanly with no visible nicks.

Does the package contain only the single 7/32-inch aircraft extension drill or are additional bits included?

The listing describes a single aircraft extension drill bit sized 7/32 inch; no extra bits, pilots or accessories are mentioned as included.

More in Bits, Hole Saws & Accessory Kits

Similar items