TS 11705

TS 11705 is a standard concerned with the radius values to be used when rounding sharp corners and edges in technical drawings. Because the geometry of a workpiece affects manufacturing, assembly, and how a part is interpreted on the drawing, the consistent notation of rounding radii is an important part of technical drawing practice.

How rounding radius is understood in technical drawing

A rounding radius describes a controlled curved transition instead of a sharp corner. In general technical drawing practice, such transitions are not just visual details: they can influence manufacturability, fit, and contact behavior. By covering the radius values to be used according to the type of workpiece, this standard helps bring more consistency to how these edge conditions are specified on drawings.

What the scope means in practice

• Focuses on radius values for rounding sharp corners and edges.
• Indicates that the chosen radius depends on the type of workpiece.
• Supports consistent representation of similar edge conditions in technical drawings.
• Is linked to DIN 250 (1972) and to established technical drawing conventions.

Standards of this kind are useful for keeping dimensioning and shape description aligned across drawings. When rounding values are shown with the same logic, the risk of different interpretations during production and inspection is reduced.

The standard supports the general technical framework for treating sharp corners, but it does not by itself define every design detail of a part. In practice, rounding is considered together with function, surface transition, and the manufacturing method.