Overview
ISO 3937-2:2008 - "Cutter arbors with tenon drive - Part 2: Dimensions of 7/24 taper" specifies dimensional, tolerance and basic material requirements for cutter arbors with a tenon drive using a 7/24 taper. The standard covers both regular and enlarged contact surface arbors and provides separate provisions for arbors intended for manual and automatic tool changers. All dimensions are metric (millimetres) and tolerances follow ISO 2768 series unless otherwise stated.
Key topics and requirements
- Scope: Dimensions of cutter arbors with tenon drive featuring a 7/24 taper; includes enlarged contact-surface designs.
- Manual vs automatic: Separate dimensional tables and schematic figures for arbors intended for manual changing (conforming to ISO 297) and automatic tool changers (conforming to ISO 7388-1).
- Interchangeability: Milling cutter bearing dimensions and retaining screw sizing are in conformity with ISO 2780 to ensure interchangeability between cutters and arbors.
- Tolerances: Unspecified tolerances default to tolerance class “m” (linear/angular) per ISO 2768‑1 and class “mk” (geometrical) per ISO 2768‑2.
- Material / mechanical: Material selection is at the manufacturer’s discretion, but minimum tensile strength 800 N/mm² and hardness 56 (+4) HRC are required.
- Documentation: The standard provides figures and tabulated dimension sets (for various nominal diameters and tenon/thread sizes) to guide manufacture and inspection.
Practical applications
- Ensures consistent tool-holder / milling-cutter interchangeability in machining centres, manual milling machines and automatic tool changer systems.
- Guides tooling manufacturers in designing and producing tenon-drive cutter arbors with correct 7/24 taper dimensions.
- Supports machine-tool designers, maintenance engineers and workshop managers when specifying compatible arbors and cutters.
- Used by metrology and quality assurance teams for dimensional inspection, acceptance testing and supplier audits.
Who should use this standard
- Tool and arbor manufacturers
- CNC and milling machine builders
- Tooling distributors and procurement teams
- Quality/control and metrology departments
- Maintenance and production engineers in machining operations
Related standards
- ISO 2780 - Milling cutters with tenon drive (interchangeability)
- ISO 297 - 7/24 tapers for tool shanks (manual changing)
- ISO 7388-1 - Tool shanks with 7/24 taper for automatic tool changers
- ISO 2768-1 / ISO 2768-2 - General tolerances (linear/angular and geometrical)
Keywords: ISO 3937-2:2008, cutter arbors, tenon drive, 7/24 taper, tool holders, milling cutters, interchangeability, ISO 2780, ISO 297, ISO 7388-1, tolerances, hardness, tensile strength.