TS EN ISO 3040

TS EN ISO 3040 is a standard in the geometrical product specifications (GPS) field that addresses how cones are dimensioned and toleranced. The topic is important because cone geometry is used in many precision parts, from locating and centring features to tapered fits and machine components, and it must be described on drawings in a way that is consistent, unambiguous and suitable for manufacture and inspection.

Why cone geometry needs specific notation

Unlike a cylindrical surface, a cone changes diameter along its length, so a single size value is not enough to define the feature clearly. In general engineering practice, the cone’s axial length, included angle or half-angle, orientation and reference relationships all influence how the part is made and verified. Within the GPS concept, this kind of terminology helps transfer the designer’s intent from the drawing into production and metrology without unnecessary interpretation.

General technical context for design and inspection

Standards on cone dimensioning support the consistent presentation of tapered features on technical drawings, including how the feature is identified and how tolerances are associated with it. Clear cone definition is valuable in assembly situations where seating, self-centring or controlled taper contact matters. This listing is a withdrawn standard, but the subject remains a familiar and practical part of mechanical drawing and geometric tolerancing practice.

• Focuses on clear and unambiguous identification of conical features on drawings.
• Size, angle and datum relationships must be considered together.
• Relevant to tapered fits, centring features and precision alignment.
• Uses the common language of the GPS system for engineering documentation.