Kennametal 3894825 Drill Bit Letter E 0.2500 in Solid Carbide

Product Description

The KENNAMETAL 3894825 is a stub-length (screw machine length) solid carbide drill bit in Letter E size, equivalent to 0.2500 inches in diameter. It features a 180-degree flat bottom point geometry, making it well suited for drilling flat-bottomed holes and applications where a conventional conical point would be problematic. The two-flute regular spiral design promotes efficient chip evacuation, while the bright/uncoated finish leaves the carbide substrate exposed for use in a wide range of workpiece materials. The overall length is 3.1102 inches (79.00 mm), and the flute length is 1.3386 inches (34.00 mm). This bit is installed and operated by machinists and toolroom technicians working with CNC machining centers, drill presses, and screw machine setups.

This drill bit is designed for precision machining environments where stub-length rigidity and tight hole tolerances are required. The short overall length reduces deflection under high feed rates and is a common choice for production drilling in metal components. The straight cylindrical shank diameter of 0.3150 inches (8.00 mm) seats in standard drill chucks and collet systems. The maximum drilling depth is 0.9449 inches (24.00 mm). Applications include general metalworking, screw machine operations, and any setup that demands a flat bottom entry or exit condition in the bore.

Key Features

• Solid carbide construction for hardness and wear resistance in metalworking applications
• 180-degree flat bottom point eliminates the conical drill point, producing flat-floored holes
• Stub/screw machine length body increases rigidity and reduces runout compared to jobber-length bits
• Coolant-through capability supports high-pressure internal coolant delivery for deep or high-speed drilling
• Bright/uncoated finish - no coating buildup means consistent dimensional performance across the cutting edge
• Drill bit diameter tolerance of +0.0002 to +0.0008 inches ensures precise hole sizing for close-tolerance work
• Tapered web configuration and regular spiral flutes promote controlled chip flow and reduced thrust force

Compatibility

The 3894825 belongs to KENNAMETAL Series B707A-FBS and conforms to DIN 6535 shank specification. It fits standard drill chucks and collet holders accepting a 0.3150-inch straight cylindrical shank. Suitable for use in CNC machining centers, turret lathes, screw machines, and drill presses equipped for stub-length tooling.

Installation Notes

This drill bit is installed and removed by machinists following standard toolroom lockout and machine-stop procedures before any tool change. Ensure the chuck or collet is clean and within tolerance before seating the straight shank to prevent runout. When using the coolant-through feature, verify that coolant pressure and flow rate are within the machine spindle specifications before operation. Inspect the cutting edges for chipping before each use, as solid carbide is hard but brittle and can chip if dropped or mishandled during setup.