Metal twist drill Wolfcraft 7258000 HSS 4 mm, overall length 53 mm, working length 20 mm, DIN 338, 1/4" hex shank

Straight HSS metal twist drill by Wolfcraft with a 4 mm diameter, overall length 53 mm and working length 20 mm. The drill is precision ground to DIN 338 standards with a 118° point angle, reduced-diameter spiral and reinforced core designed to increase tool life and ensure stable drilling performance in a range of materials. The 1/4" (6.3 mm) hex shank allows fast bit changes and secure use with bit holders and quick-change chucks.

Advantages

The high-speed steel (HSS) construction provides good hardness and heat resistance for general metalworking. Precision grinding to DIN 338 ensures accurate concentricity and cutting geometry for clean holes and consistent drilling. A reduced-diameter spiral improves chip evacuation in short-working-length applications, while the reinforced core increases rigidity and reduces the risk of breakage during side loads. The 1/4" hex shank offers compatibility with common bit holders and quick-change systems for faster tool changes on drills, drivers and screwdrivers with hex adapters.

Suitable for

• Drilling holes in steel and cast steels
• Working with gray iron and non-ferrous metals (aluminum, brass)
• Drilling in plastics and composite materials
• Use in handheld drills, drill presses and cordless drivers with hex adapters

Key specifications

• Material: High-speed steel (HSS)
• Cutting diameter: 4 mm
• Overall length: 53 mm
• Working (flute) length: 20 mm
• Point angle: 118°
• Shank type: 1/4" (6.3 mm) hex shank
• Flute design: Reduced-diameter spiral with reinforced core

How to use

Mark the drilling position and secure the workpiece to prevent movement. Select the appropriate drill speed for the material; lower speeds for harder metals and higher speeds for softer metals and plastics. Use light feed pressure and allow the drill to cut without forcing to avoid overheating. For deeper holes or hard materials, apply cutting fluid or lubricant to extend tool life and improve chip evacuation. Install the drill into a compatible 1/4" hex holder or chuck, verify secure seating, and start drilling with steady, controlled motion.

Usage recommendations

Use appropriate personal protective equipment (safety glasses, gloves) and clamp workpieces securely. For prolonged drilling in steel or cast materials, use cutting fluid and periodically withdraw the drill to clear chips. Store drills in a dry place and protect cutting edges from knocks to maintain performance.