Value Collection 01379106 Letter J Cobalt Drill Bit

Product Description

The VALUE COLLECTION 01379106 is a screw machine length cobalt drill bit sized at Letter J (0.2770 inches decimal equivalent) with a 135-degree split point. Screw machine length bits are shorter than jobber-length equivalents, providing increased rigidity and reduced deflection when drilling in drill presses, CNC machines, and screw machines. The cobalt construction handles elevated heat generated when cutting hard ferrous metals, stainless steel, and high-alloy materials. The split point geometry starts on contact without a center punch, reducing walking and improving hole location accuracy. The straw finish indicates a heat-treated cobalt alloy rather than a coated surface.

This bit is suited for production machining environments, fabrication shops, and maintenance operations where hard or tough materials require a more durable cutting edge than standard high-speed steel provides. Typical applications include drilling stainless steel, hardened alloys, cast iron, and other difficult-to-machine metals. The short overall length of 2-11/16 inches makes it well suited for tight-clearance setups and rigid machine-spindle work where a longer jobber bit would introduce chatter or deflection.

Key Features

• Letter J size, 0.2770 inches decimal equivalent, within the 0.2500 to 0.3000 inch size range
• 135-degree split point starts on contact without center punching and reduces walking
• Cobalt tool material retains hardness under high cutting temperatures
• Screw machine length body provides greater rigidity than jobber-length bits
• Right-hand cutting direction, regular spiral flute for standard chip evacuation
• Straight shank fits standard drill chucks and collets without adapters
• Heavy-duty grade construction for demanding production and fabrication use

Compatibility

Designed as a standard replacement or production-stock screw machine length drill bit for use in drill presses, CNC drilling centers, turret lathes, and screw machines accepting straight-shank bits in the 0.2500 to 0.3000 inch size range.

Installation Notes

Installation is performed by machinists and toolroom technicians following standard tooling change procedures. Secure the straight shank fully in the chuck or collet and verify runout before drilling. Power down and lock out the machine spindle before changing tooling per applicable machine safety procedures. Do not exceed the recommended feed and speed parameters for the workpiece material and bit diameter to avoid premature edge wear or breakage.