Walter-titex 5058402 Jobber Drill Bit 0.4mm Hss

Product Description

The WALTER-TITEX 5058402 is a jobber-length twist drill bit designed for precision drilling in small-diameter applications. Built from high-speed steel (HSS) with an oxide finish, it measures 0.4 mm (0.0157 inches) in diameter with an overall length of 20.00 mm (approximately 25/32 inches). The 118-degree standard point angle and two-flute spiral geometry provide clean entry and efficient chip evacuation. The straight-cylindrical shank is sized at 0.0157 inches in diameter for direct chuck mounting. This bit is suited for work requiring tight tolerances, with a diameter tolerance of h8. Licensed tradespeople and precision machinists working with small-diameter holes in metal substrates will find this bit appropriate for production and repair tasks alike.

This drill bit is intended for use in cast iron and steel workpieces in both blind hole and stack drilling applications. The regular spiral type and web-thinned, tapered web construction help reduce thrust force and improve centering on entry, making it a practical choice for small-diameter hole work in sheet metal, fixtures, and fabricated components. The series A1211 classification places it within a standardized product family conforming to ANSI, ISO, BS, and DIN specifications. No coolant-through capability is present, so conventional flood or mist cooling at the cutting zone is the standard approach.

Key Features

• 0.4 mm (0.0157 inch) diameter with h8 tolerance for tight dimensional control
• 118-degree standard point angle for general-purpose metal drilling
• High-speed steel construction with oxide coating for wear resistance
• Web-thinned, tapered web design reduces entry thrust and improves bit stability
• Right-hand cut, regular spiral flute for efficient chip removal
• Conforms to ANSI, ISO, BS, and DIN standards; Series A1211

Compatibility

Designed for drilling cast iron and steel workpieces. Suitable for blind hole and stack drilling operations. Fits any standard drill chuck or collet sized to accept a 0.0157-inch straight-cylindrical shank.

Installation Notes

Installation and use should be performed by machinists or qualified tradespeople familiar with small-diameter drill bit handling. Secure the straight-cylindrical shank firmly in a precision drill chuck or collet before operation to prevent runout. At 0.4 mm diameter, bit breakage risk increases significantly with excessive feed rate, lateral force, or improper chuck seating. Follow machine manufacturer guidelines for spindle speed and feed rate when drilling small-diameter holes in ferrous materials.