Osg 570025011 Screw Machine Drill Bit 0.25in Solid Carbide

Product Description

The OSG 570025011 is a solid carbide screw machine length drill bit designed for high-performance drilling in ferrous materials. Built to Series 5700 specifications, it features a 0.25 inch (1/4 inch, Letter E, 6.35 mm) diameter with a 180-degree flat drill point, making it well suited for flat-bottomed holes and precision spot drilling. The two-flute spiral design with a web-thinned, tapered web configuration reduces thrust and improves chip evacuation. At 70 mm overall length with a 30 mm flute length, this short-length geometry provides rigidity for high-feed applications. Licensed HVAC, plumbing, or mechanical contractors and machining professionals install this bit for demanding production work.

The OSG 570025011 is intended for use in steel, alloy steel, and cast iron workpieces. The screw machine length profile — shorter than jobber length — delivers added stiffness in CNC machining centers, drill presses, and manual machine work where deflection must be minimized. The 2xD flute-to-diameter ratio and right-hand cut geometry suit it for through-hole and blind-hole drilling in production and maintenance environments alike. It ships as a single-piece unit.

Key Features

• 0.25 inch (1/4 inch) diameter with a 180-degree flat drill point for flat-bottomed and flush-start drilling
• Solid carbide construction for extended tool life in ferrous materials
• Web-thinned tapered web reduces entry thrust and improves chip flow
• Two-flute spiral geometry with regular spiral type for balanced cutting action
• Screw machine (stub) length — 70 mm overall, 30 mm flute — maximizes rigidity
• Straight-cylindrical shank fits standard drill chucks and collets without modification

Compatibility

Designed for drilling steel, alloy steel, and cast iron workpieces. Straight-cylindrical shank is compatible with standard drill chucks, ER collet holders, and Weldon-style tooling that accepts a 0.25 inch shank. Part of the OSG Series 5700 screw machine length carbide drill line.

Installation Notes

Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits for the application. Use appropriate cutting fluid or coolant directed at the cutting zone when drilling steel or cast iron to manage heat buildup; this bit does not feature coolant-through channels. Follow machine manufacturer guidelines for spindle speed and feed rate based on workpiece hardness and depth of cut. Inspect the cutting edge and web condition before each use and replace when wear affects hole tolerance or surface finish.