HSS-E Cobalt 5% Drill Bit DIAGER 731, Fully Ground, Cylindrical Shank

DIAGER 731 HSS-E Cobalt 5% Drill Bit, Fully Ground, is engineered for demanding metalworking applications. With a 5% cobalt alloyed HSS-E construction, this drill bit maintains hardness and sharpness even under high temperatures. The fully ground design ensures consistent accuracy and smooth cutting, while the split point 135° tip delivers precise, self-centering starts without wandering on contact.

The cylindrical shank, compatible with chucks up to 12.7 mm, offers versatility for both handheld and bench drilling machines. The DIAGER 731 series is suitable for materials with tensile strength up to 1200 N/mm², including stainless steel, alloy steel, and cast iron. The N-type flute geometry and h8 diameter tolerance further enhance chip evacuation and dimensional accuracy, supporting high-quality hole finishes in challenging materials.

Meeting DIN 338 standards, this drill bit is designed for users who require reliable performance and dimensional precision. The robust cobalt-enriched steel composition helps resist wear and deformation, especially during prolonged drilling in hard metals. The range includes a variety of diameters and lengths, allowing users to select the right tool for each specific job.

DIAGER 731 HSS-E Cobalt 5% Drill Bit, Fully Ground

Technical Features of DIAGER 731 HSS-E Cobalt 5% Drill Bit, Fully Ground

This steel drill bit is optimized for high-performance drilling in tough metals. The 5% cobalt content increases heat resistance, while the fully ground construction ensures a precise and stable drilling process. The split point 135° tip improves centering and reduces the risk of walking, making it suitable for applications where accuracy is critical.

• Material: HSS-E with 5% cobalt
• Tip geometry: Split point, 135° angle
• Shank type: Cylindrical, up to 12.7 mm diameter
• Flute type: N-type spiral
• Diameter tolerance: h8
• Standard: DIN 338
• Suitable for materials with tensile strength up to 1200 N/mm²

The combination of these features allows for effective drilling in stainless steel, alloy steels, and cast iron. The split point tip reduces the need for pilot holes and helps achieve clean starts, even on smooth or hard surfaces.

Available Sizes and Variants

The DIAGER 731 series is available in a wide range of diameters and lengths, supporting diverse industrial and workshop requirements. Each variant maintains the same technical standards and construction quality, ensuring consistent results across different sizes.

• Diameter range: 2.0 mm to 13.0 mm
• Corresponding flute and overall lengths per model
• SKU-specific details available for each size

This flexibility allows users to match the drill bit to the specific thickness and hardness of the workpiece, optimizing both tool life and hole quality.

Common Applications

The DIAGER 731 HSS-E Cobalt 5% Drill Bit, Fully Ground, is used for drilling in:

• Stainless steel (inox)
• Alloy steel
• Non-alloy steel
• Grey cast iron
• Ductile cast iron

It is suitable for both manual and machine drilling operations in maintenance, fabrication, and metalworking industries. The design supports precise starts and stable drilling, especially on hard or smooth surfaces.

Catalog Technical Content

According to catalog data, the DIAGER 731 series features HSS-E steel with 5% cobalt, fully ground construction, split point 135° tip, DIN 338 compliance, N-type spiral flutes, h8 diameter tolerance, and a cylindrical shank. The drill bit is engineered for materials with tensile strength up to 1200 N/mm² and is available in multiple diameters and lengths. For best results, use moderate speeds, steady feed, and coolant when drilling hard metals.