Chicago-latrobe 53871 Jobber Drill Bit Letter C Tin Hss

Product Description

The CHICAGO-LATROBE 53871 is a jobber-length drill bit designed for professional metalworking and heavy-duty drilling applications. Built from high speed steel with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction when cutting through steel alloy and similar ferrous materials. The bit features a 135-degree split point for fast penetration and reduced walking on contact, paired with a parabolic flute geometry that efficiently evacuates chips during through-hole drilling. At 0.2420 inches in diameter (Letter C) with a 4-inch overall length, this bit fits standard drill chucks and is suited for use by machinists, maintenance technicians, and tool-and-die professionals.

This drill bit is engineered for drilling steel alloy workpieces in production and maintenance environments. The parabolic flute design handles deeper cuts with fewer pecking cycles, making it practical for both through-hole and deeper-bore work on structural steel, plate, and machined components. The straight-cylindrical shank seats reliably in keyless or keyed drill chucks across a range of drill presses, CNC machines, and heavy-duty hand drills. It is sold individually and belongs to the Chicago-Latrobe Series 150DHT, which is rated as a heavy-duty grade product line.

Key Features

• Letter C size, 0.2420 inch diameter with a tolerance of -0.0007 to 0.0000 inches for accurate hole sizing
• 135-degree split point reduces thrust and eliminates center-punch requirement on most steel surfaces
• Parabolic flute geometry promotes efficient chip evacuation in deeper cuts
• Titanium nitride (TiN) coating increases surface hardness and extends cutting life compared to uncoated HSS
• Web-thinned, tapered web construction reduces cutting resistance at the chisel edge
• Right-hand cut with straight-cylindrical shank for compatibility with standard drill chucks

Compatibility

Designed as an OEM-style replacement or direct-use jobber-length drill bit for applications requiring a Letter C (0.2420 inch) diameter hole in steel alloy and similar materials. Fits any standard drill chuck accepting a 0.2420-inch straight-cylindrical shank.

Installation Notes

This bit should be installed by a qualified machinist or maintenance technician familiar with proper chuck tightening procedures and safe drill press or hand-drill operation. Ensure the drill is fully powered down and unplugged before changing bits. Use appropriate cutting fluid or lubricant when drilling steel alloy to maintain coating integrity and extend bit life. Secure the workpiece with a vise or clamp before drilling to prevent rotation and maintain hole accuracy.