Value Collection 01378215 Size 21 Cobalt Drill Bit

Product Description

The VALUE COLLECTION 01378215 is a screw machine length cobalt drill bit sized at wire gauge number 21, equivalent to 0.1590 inches in diameter. The shortened overall length of 2.125 inches makes it well-suited for close-quarter drilling where standard-length bits would be impractical. The 135-degree split point reduces walking on entry and requires less feed pressure to initiate a cut. Cobalt construction provides elevated heat resistance compared to standard high-speed steel, making this bit appropriate for drilling harder metals including stainless steel, cast iron, and high-alloy steels. Right-hand cutting with a regular spiral flute pattern ensures efficient chip evacuation during operation.

This bit is used in metalworking and fabrication applications where stub-length reach is required. The screw machine length format is common in drill press, CNC turret, and hand-drill setups where a shorter cutting tool reduces deflection and improves hole accuracy. It is suitable for production environments drilling through mild steel, stainless, and similar ferrous materials. Heavy-duty grade designation indicates it is built for repetitive industrial use rather than light-duty occasional cutting. Machinists, pipefitters, ironworkers, and general fabricators are the primary users of this bit style.

Key Features

• Wire gauge size 21, 0.1590 inch diameter for precise hole sizing
• Cobalt construction for heat resistance in hard-metal drilling
• 135-degree split point reduces entry walking and lowers required feed pressure
• Screw machine (stub) length at 2.125 inches overall for close-clearance applications
• Regular spiral flute with 1.0625-inch flute length promotes chip removal
• Straight shank compatible with standard drill chucks and collets

Compatibility

Designed as an OEM-style replacement or production-use drill bit for metalworking applications requiring a wire gauge size 21 straight-shank stub-length bit in any standard drill chuck accepting the 0.1590-inch shank diameter.

Installation Notes

Installation of this bit is performed by machinists or metalworking trades using standard keyless or keyed drill chucks. Secure the straight shank fully in the chuck before operation to prevent runout or slippage. Always wear appropriate eye protection and ensure the workpiece is properly clamped before drilling. Use cutting fluid or coolant appropriate to the workpiece material to extend bit life, particularly when drilling stainless or high-alloy steel.