ISO 3860:2011

Overview

ISO 3860:2011 - "Bore cutters with key drive - Form milling cutters with constant profile" specifies the dimensional and tolerance requirements for bore form milling cutters with a key drive. The standard covers three main form milling cutter types with constant profile: convex milling cutters, concave milling cutters, and corner‑rounding cutters. All dimensions and tolerances in the standard are given in millimetres and are presented as drawings and dimension tables for consistent manufacturing and interchangeability.

Key topics and requirements

• Scope and types: Defines dimensions for bore cutters with key drive in three types: convex, concave and corner‑rounding cutters.
• Dimensional data: Contains figures and tabulated dimensions for each cutter form to ensure repeatable geometry and fit.
• Tolerances: Unspecified tolerances default to tolerance class "m" (ISO 2768‑1) for linear/angular and class "K" (ISO 2768‑2) for geometric tolerances.
• Interchangeability: Arbor and cutter interchangeability dimensions are specified to be in accordance with ISO 240 (milling cutter arbors/mandrels).
• Normative references: References ISO 240 and ISO 2768 (Parts 1 and 2) as essential for correct application.
• Publication context: Second edition (2011) - a minor revision of the 1976 edition, prepared by ISO/TC 29/SC 2 (small tools).

Applications and practical value

• Ensures manufacturing consistency for bore form milling cutters used in producing shaped bores, radiused corners and profile features.
• Supports tool designers and cutter manufacturers by providing standardized dimensions for production drawings and quality control.
• Helps machine shops and CNC programmers select compatible cutters and arbors, reducing setup time and ensuring interchangeability.
• Useful for procurement and inspection teams to specify and verify conformity of purchased cutters against internationally accepted dimensional standards.
• Reduces design ambiguity and minimizes rejected parts or tooling mismatches across suppliers.

Who should use this standard

• Tool and cutter manufacturers
• Mechanical designers and tooling engineers
• CNC programmers and machinists
• Quality assurance and inspection personnel
• Procurement teams specifying tooling requirements

Related standards

• ISO 240 - Milling cutters: interchangeability dimensions for cutter arbors or mandrels
• ISO 2768‑1 / ISO 2768‑2 - General tolerances for linear/angular and geometric features

Keywords: ISO 3860:2011, bore cutters, form milling cutters, key drive, convex milling cutters, concave milling cutters, corner‑rounding cutters, dimensions, tolerances, ISO 240, ISO 2768.