TS ISO 5419

TS ISO 5419 is a terminology standard for twist drills, bringing together the terms, definitions and common types used to describe these tools. Its focus is not on proving a drill’s performance, but on giving precise names to the geometric features that distinguish one twist drill form from another.

Core geometry terms used for twist drills

Twist drills are cutting tools that advance into a workpiece while removing material as chips, and their behaviour is strongly shaped by geometry. In this technical field, distinctions such as point angle, helix angle, diameter, cutting lips, flutes and related features matter because small differences can change cutting action, chip evacuation and the intended application. A terminology standard like this provides the common language needed to describe those differences consistently.

What this standard covers

According to the supplied scope, the standard presents the most commonly used types of twist drills and the associated geometrical definitions. In other words, it is a naming and classification reference for understanding drill forms, rather than a document that prescribes manufacturing methods or test procedures. The listing is based on ISO 5419:1982 with Technical Corrigendum 1:1996, so the TS edition reflects that established international terminology framework.

• Helps harmonise terminology when different manufacturers or workshops use different names for the same drill form.
• Separates drill type designation from geometric features, improving clarity in technical communication.
• Supports cataloguing, drawings, training materials and engineering documentation for drilling tools.