Overview
ISO 9013:2017 - Thermal cutting: Geometrical product specification and quality tolerances defines how to classify and measure the geometric quality of thermal cuts produced by oxyfuel (flame), plasma and laser cutting. The standard sets common definitions, inspection methods and acceptance tolerances for cut surfaces and dimensions when referenced on technical drawings or delivery conditions. It applies to:
- Flame (oxyfuel) cuts: 3 mm to 300 mm thickness
- Plasma cuts: 0.5 mm to 150 mm thickness
- Laser cuts: 0.5 mm to 32 mm thickness
Note: flatness defects are not directly addressed; use only when explicitly referenced in documentation.
Key topics and technical requirements
- Terms & definitions: standardized vocabulary such as kerf width, cut thickness, drag, burr/dross, gouging, melting of top edge (r), and profile element height (Zt).
- Cut quality parameters:
- Perpendicularity/Angularity tolerance (u) - tolerance band for cut profile inclinations and included flatness deviations.
- Mean height of the profile (Rz5) - arithmetic mean over five profile elements used to quantify surface roughness of cut faces.
- Form and location tolerances: straightness, parallelism and perpendicularity tolerances for cut features referenced in drawings.
- Dimensional tolerances: rules for parts with and without subsequent finishing, including machining allowances.
- Measurement & inspection procedures: measuring points, evaluation lengths, and instrument requirements. Example instrument error limits given in the standard: u = 0.02 mm; Rz5 = 0.002 mm; n = 0.05 mm; r = 0.05 mm; straightness = 0.2 mm.
- Documentation and designation: how to indicate cut quality and tolerances on technical drawings and in title blocks (Sections 9–10).
- Informative annexes: achievable cut qualities for different processes (Annex A) and process principles (Annex B).
Practical applications
- Specifying cut quality and acceptance criteria on engineering drawings and purchase orders.
- Selecting an appropriate cutting process (oxyfuel, plasma, laser) based on achievable tolerances and surface quality.
- Setting inspection procedures and measurement methods for quality control and incoming part verification.
- Defining machining allowance and finishing requirements for subsequent manufacturing steps.
- Reducing ambiguity in supplier communication and ensuring consistent part interchangeability.
Who should use ISO 9013:2017
- Mechanical and structural designers preparing fabrication drawings
- Manufacturing engineers and CNC programmers choosing cutting processes
- Quality inspectors and metrology labs performing surface and dimensional checks
- Procurement and supply chain professionals specifying delivery conditions
- Standards engineers and compliance teams implementing geometrical product specifications (GPS)
Related standards
Normative references used in ISO 9013:2017 include ISO 1302, ISO 3274, ISO 4288, and ISO 8015 for surface texture, measurement methods and GPS fundamentals.
ISO 9013:2017 is essential when you need standardized, measurable tolerances and clear specification of thermal cut quality for design, procurement and inspection workflows.