Chicago-Latrobe 40580 11/32 in 135 Degree NAS Aircraft Extension Drill

Aircraft Extension Drill 11/32 in

The Chicago-Latrobe 40580 is an aircraft extension drill with a fractional size of 11/32 in. It features a 135-degree split point made from high speed steel with a black oxide finish. The material grade is machining high performance. This drill suits maintenance and assembly tasks requiring extended reach in aerospace or general metalwork.

135 Degree Split Point Limits

The 135-degree split point reduces walking on hard surfaces but demands rigid setups to prevent chatter. Maximum drilling depth is 63/64 in at a 4xD ratio, so deeper holes need peck cycles or a shorter bit. High speed steel withstands moderate heat yet dulls faster than cobalt in abrasive alloys. The 28-degree helix angle optimises chip evacuation in aluminium and mild steel.

High Speed Steel Build and Shank

Black oxide coating adds lubricity and corrosion resistance during repeated use. The straight shank fits standard drill chucks and quick-change adapters without special collets. Extended length allows access inside wing spars or fuselage frames where a stubby bit cannot reach. Buyers who need carbide wear life or coolant-through capability should select a different tool class.