M.a. Ford 20634380 Screw Machine Drill Bit 0.3438 in

Product Description

The M.A. FORD 20634380 is a solid carbide screw machine length drill bit with a 0.3438 inch (11/32 inch) diameter and a 118-degree faceted point angle. Designed for short-reach, high-rigidity drilling applications, this bit runs at the Series 206 specification with a web-thinned, parallel-web construction that reduces thrust and improves chip evacuation at entry. The straight-cylindrical shank seats directly into standard drill chucks or collet holders. With a 2.5 inch overall length and a 1.25 inch flute length, this bit is well-suited for CNC machining centers, drill presses, and manual machines where a compact cutting tool is required. No coolant-through feature; external flood or mist coolant is recommended for best tool life.

This bit is rated for use on cast iron, non-ferrous metals, stainless steel, and steel workpieces. The screw machine length format is common in production machining, sheet metal shops, and tool rooms where hole depth is modest and setup rigidity matters. The bright uncoated finish and right-hand spiral flute design make this a general-purpose carbide drill suitable for skilled machinists and tooling professionals who need consistent hole tolerance and repeatable results across moderate-to-high production runs.

Key Features

• Solid carbide construction for rigidity and wear resistance in steel, stainless, cast iron, and non-ferrous applications
• 118-degree faceted point with web-thinning reduces entry thrust and improves centering
• Screw machine (short) length format — 2.5 inches overall — maximizes stability in tight setups
• Straight-cylindrical shank at 0.3438 inches diameter fits standard chucks and collet holders
• 2-flute right-hand spiral design with regular spiral for efficient chip removal
• Diameter tolerance of +0.0000 to -0.0005 inches for close-tolerance hole requirements

Compatibility

Designed as an OEM-style replacement or direct sourcing option for screw machine length carbide drill bits in the 0.3000 to 0.3500 inch diameter range. Fits any machine spindle or drill chuck accepting a 0.3438 inch straight-cylindrical shank.

Installation Notes

Installation and use should be performed by qualified machinists familiar with carbide tooling. Secure the shank fully in the collet or chuck before spindle engagement, and verify runout is within acceptable limits for the intended tolerance. Carbide is brittle — avoid interrupted cuts at high feed rates without confirming setup rigidity. External coolant or cutting fluid is recommended since this bit does not include a coolant-through feature.