Value Collection 01378280 Size 28 Cobalt Screw Machine Drill Bit

Product Description

The VALUE COLLECTION 01378280 is a screw machine length drill bit designed for high-speed, close-tolerance drilling in metal and hard materials. Built from cobalt high-speed steel, it handles heat and wear better than standard HSS bits, making it a reliable choice for production drilling, repair shops, and maintenance work. The 135-degree split point geometry starts on contact without a center punch and reduces walking on hard surfaces. At 1-15/16 inches overall length, the stub-style body provides rigidity and minimizes deflection in short setups. Decimal size is 0.1405 inches, corresponding to wire gauge size 28.

This bit is suited for drilling ferrous metals, stainless steel, cast iron, and other tough materials where heat buildup degrades standard HSS tooling. The screw machine length profile makes it a common choice for drill press work, CNC setups, and manual machining operations where rigidity matters more than reach. The straight shank fits standard three-jaw drill chucks across a wide range of machines. It is sold individually with a minimum order quantity of 12 units.

Key Features

• Cobalt construction resists heat buildup during prolonged or high-speed drilling cycles
• 135-degree split point reduces thrust and eliminates center-punch requirements on most metals
• Stub screw machine length increases rigidity and reduces bit deflection compared to jobber-length bits
• Right-hand cutting direction compatible with standard drill presses, mills, and hand drills
• Regular spiral with 2 flutes provides efficient chip evacuation in through-hole drilling
• Straight shank fits standard drill chucks without adapters

Compatibility

Designed as a standard screw machine length drill bit for use in any drill press, CNC machining center, or hand drill equipped with a straight-shank chuck capable of accepting a 0.1405-inch diameter tool.

Installation Notes

Secure the shank fully in a properly tightened three-jaw chuck before operation. Ensure the workpiece is clamped or fixtured to prevent rotation during drilling. Apply cutting fluid when drilling stainless steel or hardened alloys to extend tool life. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point shows damage.