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Chicago-Latrobe #28 135° split-point drill bit, black oxide finish

Chicago-Latrobe

Chicago-Latrobe 11152 #28 135° NAS aircraft extension drill

SKU CH-QZTG-EHFC4

#28 aircraft extension drill with 135° split point in high-speed steel for deep-hole precision

  • 135° split point starts on contact for accurate holes
  • High-speed steel with black oxide resists wear in tough alloys
  • NAS-type geometry meets aircraft extension drilling standards
  • #28 wire size drills precise 1-3/4 in depth at 4xD
  • Chicago-Latrobe 11152 built for professional machining performance

NAS-Type Aircraft Extension Drill

The Chicago-Latrobe 11152 #28 drill bit is engineered for precision drilling in aerospace applications. Its 135-degree split point ensures accurate starting and reduced walking on tough alloys. This new tool targets maintenance technicians and manufacturers who require NAS-compliant hole preparation.

High-Speed Steel Construction and Black Oxide Finish

The high-speed steel body with black oxide coating delivers hardness and corrosion resistance for extended service life. A 4xD flute geometry supports efficient chip evacuation during deep-hole drilling. The straight shank fits standard drill chucks and CNC tool holders for quick changes on the shop floor.

Practical Limits of the 135-Degree Split Point

The 135-degree point angle excels in hard materials but may produce excessive burrs in soft aluminium or plastics. Maximum drilling depth is limited to 1 3/4 inches, restricting use to thinner workpieces or stepped operations. The #28 wire gauge diameter suits specific fastener holes but cannot accommodate larger rivet sizes.

How it compares

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

Price $8.99
Cheaper than about 94% of the 2,412 comparable items (median $81.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

What drill bit size and point angle does the 11152 extension drill use?

The 11152 uses a #28 drill bit with a 135 degree split point for self-centering starts.

What shank style and flute length suit the 11152 for aircraft extension drilling?

The 11152 features a straight shank and 1 3/4 inch maximum drilling depth for deep-hole access.

How is the 11152 installed in a drill motor, and what step avoids runout?

Insert the straight shank fully into a matching collet or chuck, then tighten securely to prevent wobble.

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