ISO 3365:2016

Overview

ISO 3365:2016 defines the dimensions of indexable hardmetal (carbide) inserts with wiper edges, without fixing hole. The standard covers the geometry and dimensional tolerances for inserts primarily intended to be mounted on milling cutters by top or wedge clamping. It standardizes common triangular and square insert types (symmetrical and asymmetrical), clearance and wiper-edge angles, and recommended sizes to ensure interchangeability across manufacturers.

Key topics and technical requirements

• Types and shapes: Symmetrical and asymmetrical triangular and square inserts with specific cutting-edge angles (e.g., 90°, 75°, 45°) and defined normal clearance/wiper-edge normal clearance (0°, 11°, 15°, 20°).
• Dimensions covered: Primary dimensions such as inscribed circle diameter (d), thickness (s), and the critical locating dimension m. Recommended values and common sizes are listed in tables (Clause 7).
• Tolerances & interchangeability: Inserts are provided in tolerance classes A, C, and K (per ISO 1832). Annex A gives tolerances for d, m, and s (for example, Class A: d ±0.025 mm, m ±0.005 mm, s ±0.025 mm; Class C: m ±0.013 mm). Class usage depends on insert type and coating.
• Measurement method: Annex B specifies the method to measure dimension m - using a precision roller, vee‑block (60° for triangular, 90° for square), and dial gauge for direct error reading.
• Designation & marking: Conforms to ISO 1832; may include group-of-application symbols (ISO 513) or carbide grade commercial designation. Inserts with wiper edges are standardized without chip breakers.
• Recommended sizes: Clause 7 restricts common dimensions to standardized tables for ease of selection and interchangeability.

Practical applications - who uses ISO 3365:2016

• Tool manufacturers specifying and producing indexable carbide inserts with wiper edges for milling.
• CNC and milling tooling designers ensuring correct insert geometry for surface finish (wiper edges) and cutter clamping methods.
• Purchasing and specification engineers who select standardized insert sizes for interchangeability and supply chain consistency.
• Quality and metrology teams performing dimensional inspection and conformity checks using the measurement method in Annex B.
• Machine shops and end users selecting inserts for improved surface finish and productivity in face milling and peripheral milling operations.

Related standards

• ISO 1832 - designation and tolerance classes for indexable inserts (normative reference).
• ISO 513 - classification of hard cutting materials (group-of-application symbols).
• ISO 13399 - digital representation of cutting tool data (relationship noted in Annex D, informative).

Keywords: ISO 3365:2016, indexable carbide inserts, wiper edges, dimensions, milling cutters, tolerance classes, measurement of m, interchangeability, ISO 1832, ISO 513.