Chicago-Latrobe 45710 #40 135° Jobber Drill Bit

Chicago-Latrobe #40 Jobber Drill Bit

This Chicago-Latrobe drill bit is a #40 size jobber-length tool designed for general-purpose drilling in metal and other materials. It suits machinists, maintenance technicians and DIY users who need a precise small-diameter hole. The split-point tip helps start the cut cleanly without a centre punch. Buyers who need a larger diameter or a different point angle should choose another bit.

135° Split Point with Black Oxide

The 135-degree split-point geometry reduces walking and lowers thrust force during normal drilling, which can ease load on the drill motor. Black oxide surface treatment adds lubricity and corrosion resistance for longer cutting life. No coolant-through holes are present, so external cooling or peck drilling may be required in deep holes. High-speed steel construction handles typical workshop heat without premature dulling.

Decimal Size 0.0980 Inch Identification

The bit is marked with its decimal equivalent of 0.0980 inch alongside the wire-gauge number 40 for quick size verification. This clear marking helps operators select the correct tool from a mixed set without calipers. No additional accessories, coatings or software are bundled with the bit. The plain shank fits standard three-jaw chucks and collets.