Precision Twist Drill 040820 Hss Stub Drill 5/16 in

Product Description

The PRECISION TWIST DRILL 040820 is a high-speed steel (HSS) stub-length drill bit designed for heavy-duty boring applications where rigidity and accuracy are the priority. With a 5/16-inch tip diameter and a 2.5-inch depth of cut, this drill bit operates at a total length of 2-13/16 inches. The shortened flute and overall stub geometry reduce deflection and chatter, giving drilling operations tighter tolerances than standard-length bits. It is suited for machinists, maintenance technicians, and tradespeople who need a dependable, rigid bit for demanding metal-drilling work.

The 040820 is used in applications where a standard jobber-length drill would be prone to flexing or walking, such as drilling into plate steel, structural members, or hard stock in confined spaces. The stub format keeps the bit close to the chuck, maximizing stiffness throughout the cut. This makes it a practical choice for drill press work, CNC setups, and hand-drill use in metal fabrication or maintenance environments where hole placement accuracy matters.

Key Features

• Stub-length design reduces bit flex and increases drilling accuracy
• High-speed steel (HSS) construction handles hard metals and repeated use
• 5/16-inch diameter tip for standard fastener and passage-hole sizing
• 2.5-inch depth of cut accommodates typical plate and structural stock thicknesses
• Compact 2-13/16-inch overall length fits tight clearances and short-throat chucks

Compatibility

Designed as an OEM-style stub drill replacement compatible with standard 3-jaw drill chucks and collet systems accepting 5/16-inch shank tooling across drill presses, hand drills, and CNC drilling applications.

Installation Notes

Installation and use should be performed by qualified machinists or tradespeople familiar with rotating cutting tools. Always secure the workpiece before drilling and confirm the chuck is properly tightened before operation. Use appropriate cutting fluid for metal applications to extend bit life and improve cut quality. Inspect the cutting edges for wear or chipping before each use and replace the bit if damage is observed.

Technical Specifications

• Tip Diameter: 5/16 inches
• Depth of Cut: 2.5 inches
• Overall Length: 2-13/16 inches
• Material: High-Speed Steel (HSS)
• Drill Type: Stub Length
• Weight: 0.3 pounds
• UPC: 086071408204

Standard Information

• Brand: PRECISION TWIST DRILL
• Manufacturer Part Number: 040820