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
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.
Open preview (PDF)7/24 taper spindle noses for automatic tool changers — Part 1: Dimensions and designation of spindle noses of forms S and SF