Chicago-Latrobe 11172 #48 135° NAS aircraft extension drill

Chicago-Latrobe 11172 #48 Aircraft Extension Drill

This Chicago-Latrobe 11172 extension drill is a high-performance cutting tool designed for precision drilling in aerospace applications. It features a #48 wire gauge size and a 135-degree split point for accurate starts and reduced walking. The black oxide finish on high-speed steel provides durability and corrosion resistance for demanding machining tasks.

Suited for deep-hole drilling in tight access areas

This drill suits machinists and technicians creating deep holes up to 1 inch in confined spaces where a standard bit cannot reach. The 4xD length and 28-degree helix angle support efficient chip evacuation in deep drilling operations. It is not for buyers who need larger diameter holes or standard-length bits for general-purpose fastening work.

135-degree split point geometry

The 135-degree split point is the critical specification that determines suitability for hard materials and precision starts. This geometry centres the drill instantly without a centre punch, reducing thrust and heat generation in high-performance machining grades. Verify that your application requires this specific point angle and #48 wire size before purchasing.