Chicago-latrobe 53186 Taper Shank Drill Bit 1.3438in 4MT Hss

Product Description

The CHICAGO-LATROBE 53186 is a taper shank drill bit designed for heavy-duty drilling in metal, steel, and similar materials. It carries a 4MT (Morse Taper 4) shank for use in compatible taper-socket spindles on drill presses, lathes, and milling machines. The bit measures 1.3438 inches in diameter with a 118-degree standard point angle and a web-thinned tip to reduce thrust and improve chip evacuation at entry. Constructed from high speed steel with an oxide finish for lubricity and corrosion resistance, this bit suits general-purpose production and maintenance drilling in machine shops and fabrication environments. Machinists and toolroom technicians are the primary installers.

The 53186 is built for stationary machine tool applications requiring a large-diameter, positive-drive shank connection. The 4MT taper shank locks into the spindle socket without a chuck, transmitting torque directly and minimizing runout on deep-hole cuts. With a flute length of 8.75 inches and an overall length of 14.375 inches, it handles through-hole work in heavy plate and thick-section workpieces. The regular spiral flute promotes consistent chip clearing throughout the cut. This bit is suited to right-hand rotation only and is not rated for coolant-through delivery.

Key Features

• 1.3438-inch diameter with a diameter tolerance of +0.0000 to -0.0015 inches for accurate hole sizing
• 4MT Morse Taper shank for direct spindle engagement on compatible machine tools
• 118-degree standard point angle with web thinning to lower entry thrust
• High speed steel construction rated for general-purpose ferrous and non-ferrous drilling
• Oxide finish reduces friction and provides light corrosion protection
• Regular right-hand spiral flute with 8.75-inch flute length for effective chip removal in deep cuts

Compatibility

Designed for use in machine tool spindles and drill press quills fitted with a No. 4 Morse Taper socket. Verify spindle taper designation before installation. No specific OEM model compatibility was provided by the manufacturer for this part number.

Installation Notes

Installation is performed by qualified machinists. Power down and lock out the machine before seating or removing the taper shank. Clean both the shank taper and the spindle socket with a lint-free cloth to remove chips, oil, and debris before insertion — any contamination will prevent full seating and cause runout. Drive the shank firmly into the socket with a soft-face mallet; use the correct drift and drift slot to remove it. Never force the shank with steel hammers directly on the bit body.