1. Product Specifications

This document details twist drills with internal coolant designed specifically for steel drilling. The drills are made from high-quality micrograin carbide (HM) grades K20-K40 and conform to the DIN 6527 standard. Key geometric features include a 30° helix angle and a 140° point angle (HA). The drills are available in length variants expressed as multiples of the diameter: 3XD, 5XD, 8XD, and 12XD, enabling selection based on drilling depth requirements. Internal coolant channels enhance cooling efficiency and chip evacuation.

2. Dimensional Data and Tolerances

The drills cover diameters (Dc) from 1.00 mm up to 20.00 mm, with increments as fine as 0.10 mm or less. Diameter tolerances are primarily m7 or h7 classes, ensuring high precision. Length parameters include L1 (overall length) and L2 (flute length), both increasing with diameter and length variant. Shank diameters (D2) range from 3 mm to 20 mm, matching drill sizes for compatibility with tool holders.

3. Product Coding System

Each drill is identified by a unique alphanumeric code encoding diameter, tolerance, and length variant (e.g., 178.030062062F). This system facilitates precise ordering and inventory management.

4. Usage and Application Recommendations

• Designed for precision steel drilling requiring durability and accuracy.
• Internal coolant channels improve tool life by efficient heat dissipation and chip removal.
• Micrograin carbide construction ensures wear resistance and toughness.
• Selection of drill size and length should consider hole diameter, depth, and series designation (e.g., 12XD, 15XD) to match length-to-diameter ratios.

5. Summary of Key Parameters

6. Drill Length Variants

The length variants 3XD, 5XD, 8XD, and 12XD represent multiples of the drill diameter, affecting flute and overall lengths. Longer drills (e.g., 12XD) provide extended flute and overall lengths for deeper hole drilling.

7. Drill Series and Sizes

The drills are grouped into series such as 178 12XD, 178 15XD, 178 20XD, 178 25XD, and 178 30XD, each covering specific diameter and length ranges:

• 178 12XD: Small diameters (1.0 mm to ~2.9 mm), shorter lengths.
• 178 15XD: Medium diameters (3.0 mm to ~12.0 mm), medium lengths.
• 178 20XD: Larger diameters (2.0 mm to ~12.0 mm), longer lengths.
• 178 25XD and 30XD: Largest diameters and lengths for deep or large hole drilling.

8. Material and Standards

All drills are manufactured from micrograin carbide (HM) grades K20-K40, ensuring high hardness, wear resistance, and toughness. They comply with DIN 6527, which specifies requirements for twist drills with internal coolant channels.

9. Design Features

• 30° helix angle optimizes chip evacuation and cutting efficiency.
• 140° point angle (HA) is ideal for steel drilling, providing good centering and minimizing walking.
• Internal coolant channels enhance cooling and chip removal, improving tool life and performance.

10. Recommendations and Usage

These drills are recommended for precision steel drilling applications requiring durability and high accuracy. The internal coolant supply extends tool life and improves drilling quality. Selection should be based on hole diameter, depth, and required length-to-diameter ratio, considering the appropriate drill series and length variant.

Summary

This document serves as a comprehensive technical catalog for selecting twist drills with internal coolant for steel drilling. It provides detailed dimensional data, tolerance classes, length variants, and material specifications to support precise and durable drilling operations.