1. Product Specifications

This document details technical specifications for twist drills with internal coolant channels, designed specifically for steel drilling. The drills conform to DIN 6527 standards and are made from micrograin carbide (HM) with hardness grades K20-K40. Key geometric features include a 30° helix angle and a 140° point angle, optimized for efficient cutting and chip evacuation.

• Diameter (Dc): Ranges from 1.00 mm to 20.00 mm, with increments of 0.10 or 0.20 mm depending on series.
• Tolerance: Primarily m7 or h7 classes, ensuring precision diameter control.
• Dimensions: Overall length (L1) varies from 55 mm to 243 mm; cutting length (L2) ranges from 15 mm to 190 mm; shank diameter (D2) matches drill diameter, typically 3 mm to 20 mm.
• Material: Micrograin carbide (HM) grades K20-K40 for high wear resistance and durability.
• Design: Twist drill geometry with internal coolant channels for improved cooling and chip removal.

2. Product Series and Length Variants

Drills are grouped into series based on cutting length multiples of the diameter:

• 178 3XD Series: Standard length, cutting length ~3× diameter.
• 178 5XD Series: Longer drills, cutting length ~5× diameter, for deeper holes.
• 178 8XD Series: Extra-long drills, cutting length ~8× diameter, for very deep drilling.
• 178 12XD Series: Ultra-long drills, cutting length ~12× diameter, specialized for deep hole drilling.

3. Standards and Quality

• Manufactured according to DIN 6527, ensuring dimensional accuracy and compatibility.
• Micrograin carbide material provides high wear resistance and durability.
• Internal coolant channels enhance tool life and drilling efficiency by effective cooling and chip evacuation.

4. Key Parameters and Dimensions Summary

The following summarizes typical diameter ranges, tolerances, and corresponding dimensions:

5. Recommendations and Usage Notes

• Select drill series (3XD, 5XD, 8XD, 12XD) based on required hole depth.
• Match tolerance class (m7 or h7) to precision requirements of the application.
• Use internal coolant supply to maximize tool life and drilling performance.
• Drills are optimized for steel materials, leveraging micrograin carbide properties.

6. Additional Technical Details

• Drill series codes (e.g., 178 12XD, 178 15XD, 178 20XD, 178 25XD, 178 30XD) correspond to diameter ranges and length variants, facilitating selection for specific drilling depths and diameters.
• Helix angle of 30° and point angle of 140° are designed for efficient cutting and chip evacuation in steel.
• Extensive part codes are provided for ordering and inventory management.

This structured information supports engineers and machinists in selecting the appropriate twist drill for steel drilling tasks, ensuring optimal performance, precision, and tool longevity.