Chicago-Latrobe 55441 118 Degree Silver & Deming Drill 41/64 in

Chicago-Latrobe 55441 41/64 Drill Bit

The Chicago-Latrobe 55441 is a Silver & Deming drill bit with a 41/64 inch diameter and a 118 degree point angle. It is made from high speed steel with a black oxide finish for durability in general-purpose metal drilling. The reduced 1/2 inch shank allows it to fit standard drill chucks. This bit suits maintenance and fabrication tasks requiring a specific large-hole size.

Installation And Common Issues

The reduced shank inserts directly into a 1/2 inch chuck without a special adapter. Tighten the chuck securely to prevent the bit from spinning under load. A common issue is excessive heat buildup when drilling thick steel without cutting fluid. Using lubrication and moderate speed reduces wear and prevents the cutting edges from dulling prematurely.

Capacity And Headroom

This bit comfortably handles drilling 41/64 inch holes in mild steel, cast iron, and non-ferrous metals. The high speed steel construction provides adequate wear resistance for repetitive shop use. It runs out of effective cutting life in hardened alloys or abrasive materials where cobalt or carbide tooling is required. The 118 degree point is not suited for precision starting on curved surfaces without a centre punch.