ISO 9270-1:2010

Overview

ISO 9270-1:2010 specifies the dimensions and tolerances for 7/24 taper spindle noses with tenons used in automatic tool changers. It covers spindle nose forms S and SF, intended to mate with corresponding tool shanks of forms A, AD, AF, U, UD and UF as defined in ISO 7388-1. All dimensions are given in millimetres and tolerancing follows ISO GPS principles.

Key topics and technical requirements

• Spindle nose forms: Definitions and dimensional drawings for form S (standard) and form SF (with provisions for inner coolant supply).
• Dimensional tables: Detailed diameter, length and tenon dimensions for standard shank sizes (e.g., N°30, 40, 45, 50, 60) as shown in the standard’s tables and figures.
• Tenon geometry: Dimensions and fits for tenons and tenon slots to ensure secure mechanical engagement and repeatability.
• Tolerancing and measurement:
  • All tolerancing in accordance with ISO 8015 (GPS fundamentals).
  • Non-specified linear/angular tolerances per ISO 2768‑1 and geometrical tolerances per ISO 2768‑2.
  • Thread requirements referenced to ISO 68‑1 and ISO 965‑2 where applicable.
• SF variant: Option to add two holes in the spindle nose face for inner coolant supply, with specified diameters and positions.
• Materials and heat treatment: Requirements to ensure adequate strength, hardness, toughness and wear resistance of spindle noses.
• Designation rules: Standardized naming (example: Spindle nose ISO 9270-1 – S40) to ensure unambiguous identification.

Applications and who uses this standard

ISO 9270-1 is essential for:

• Machine tool and spindle manufacturers designing automatic tool changers and spindle noses.
• Toolholder and tooling vendors ensuring interchangeability with standard tool shanks (ISO 7388-1).
• CNC machine integrators and OEMs specifying compatible spindle/tool interfaces.
• Quality, metrology and procurement teams validating part conformity to international dimensions and tolerances.
• Maintenance and retrofit engineers selecting replacement spindle noses or upgrading coolant-through features.

Related standards

• ISO 7388-1 (tool shanks with 7/24 taper - compatibility)
• ISO 68-1, ISO 965-2 (thread definitions/tolerances)
• ISO 2768-1 / ISO 2768-2 (general tolerances)
• ISO 8015 (GPS fundamentals)
• ISO 898-1 and ISO 4762 (fixing screws and properties)

Keywords: ISO 9270-1:2010, 7/24 taper spindle noses, automatic tool changers, spindle nose dimensions, spindle nose tolerances, form S, form SF, tool shanks, tenon dimensions, inner coolant supply, ISO 7388-1.