ISO 702-4:2004

Overview

ISO 702-4:2004 (Machine tools - Connecting dimensions of spindle noses and work holding chucks - Part 4: Cylindrical connection) specifies the sizes required for interchangeability between cylindrical spindle noses and the corresponding connecting faces of face plates or work holding chucks. This part of ISO 702 defines dimensional references, hole patterns and designation conventions used by manufacturers and machine shops to ensure compatible, repeatable workholding.

The standard was prepared by ISO/TC 39 (Machine tools), Subcommittee SC 8 (Work holding spindles and chucks) and forms part of the multi-part ISO 702 series covering conical, camlock, bayonet and cylindrical connections.

Key Topics

• Scope and purpose: Establishes sizes for interchangeability of cylindrical connections on spindle noses and matching chucks/face plates.
• Size range: Dimensions and interchange data are provided for size numbers specified in the standard (reference sizes No. 3 to No. 28), with nominal diameters and detailed dimension tables.
• Bolt circle and hole patterns: The standard addresses a single bolt circle per spindle nose, specifying the number of holes (for example, 6 holes for Size No. 3 and 12 holes for Sizes No. 4 to No. 28) and requirements so that the chuck pitch is a multiple of 30° to match spindle holes.
• Connecting-face details: Tables and figures show the required mating-face dimensions for face plates and work holding chucks to ensure correct fit and function.
• Designation: A cylindrical connection is designated by the part number and nominal size (for example, ISO 702-4 - No. 8).

Applications

• Retrofit and replacement of chucks, face plates and spindle-mounted accessories without custom rework.
• Standardized manufacturing of spindles and workholding equipment to ease supply-chain compatibility.
• Maintenance planning and parts procurement for machine shops and production facilities.
• Design of new machine tools where consistent, repeatable mounting and interchangeability of tools and chucks are required.

Benefits include reduced downtime, simplified inventory of spare parts, improved interchangeability across equipment from different manufacturers, and clearer specification for suppliers and OEMs.

Related Standards

• ISO 702-1 - Conical connection
• ISO 702-2 - Camlock type
• ISO 702-3 - Bayonet type

Note: ISO 702-4:2004 includes figures and tables that give exact dimensions and tolerances for each size. Users should consult the full published standard for precise numeric data and implementation details, and be aware of any applicable patents or national adaptations before production or procurement.