ISO 2402:1972

Overview

ISO 2402:1972 is an international standard that specifies the dimensions and fitting requirements for shell reamers with taper bore featuring a taper ratio of 1:30 (included), equipped with slot drives and corresponding arbors. Developed by ISO Technical Committee ISO/TC 29, which focuses on small tools, this standard ensures consistency and interchangeability of shell reamers and their arbors across international markets.

This standard covers shell reamers with outside diameters from 19.9 mm (0.7835 inch) up to 101.6 mm (4 inches), detailing both metric and inch dimensional series. It also provides guidelines on slot drive dimensions, fitting tolerances, and methods for checking taper elements.

Key Topics

• Shell Reamers with Taper Bore (1:30): Specifies general and fitting dimensions for shell reamers designed with a taper bore of 1:30, accommodating diameters above 19.9 mm.
• Slot Drive and Arbor Design: Defines precise dimensions for the slot drives on the taper bores and the tenon drives on compatible arbors to ensure secure fitting and torque transmission.
• Dimensional Tables: Includes comprehensive tables listing dimensional data in both metric and imperial units for:
  • Outside diameters, taper bore diameters, and overall lengths of shell reamers.
  • Corresponding arbor dimensions including Morse taper shanks and tenons.
  • Slot and tenon interchangeability dimensions to ensure compatibility.
• Tolerances and Fits: Provides specified tolerances for critical diameters (e.g., diameter d and d1 of taper bores and arbor ends) and permissible variations to maintain optimal clearance and tight fit between shell reamers and arbors.
• Methods of Checking Taper Elements: Outlines procedures for verifying taper bore and arbor dimensions using taper plug gauges and taper ring gauges, ensuring conformity to the specified positioning and limiting clearance values.
• Interchangeability: Ensures that shell reamers and their arbors manufactured according to ISO 2402 are fully interchangeable, with dimensional ranges carefully chosen to maintain sufficient reamer wall thickness for durability.

Applications

ISO 2402:1972 is essential for manufacturers, suppliers, and users of shell reamers and tool arbors involved in a wide range of precision machining and metalworking operations. Key applications include:

• Machining Operations: Facilitates accurate hole finishing using shell reamers that can be securely mounted on matching arbors with taper drives.
• Tooling Standardization: Enables toolmakers to produce shell reamers and arbors that meet internationally recognized dimensional and tolerance requirements.
• Maintenance and Replacement: Assures that replacement shell reamers or arbors fit consistently into existing machines or tool setups, minimizing downtime.
• Global Trade and Compatibility: Supports cross-border supply and interchange of tooling components due to universally accepted dimensional standards.

The standard's focus on slot drive and arbor tenon interchangeability also enhances safety and performance during high-speed rotation and machining stresses by ensuring proper torque transmission and robust fitting.

Related Standards

ISO 2402:1972 complements and supplements several related ISO standards on reamers and tooling, including:

• ISO/R 236: Hand reamers and long fluted machine reamers with Morse taper shanks – provides dimensions for different types of reamers using Morse taper connections.
• ISO/R 240: Interchangeability dimensions for milling cutters and cutter arbors or cutter mandrels, offering guidelines for related rotary cutting tool fittings.
• ISO/R 521: Machine chucking reamers with parallel shanks – covers reamers with non-tapered shanks and their fitting dimensions.
• ISO/R 522: Special tolerances for reamers – defines tighter tolerance limits for high-precision reamers which may be referenced when special tolerances are required for shell reamers.

Together, these standards create a comprehensive framework for the design, manufacture, and inspection of reamers and their mounting accessories, facilitating global consistency in tooling components.

Keywords: ISO 2402, shell reamers, taper bore reamers, taper 1:30, slot drive, arbor dimensions, Morse taper, tooling standards, reamer interchangeability, machining tool standards, reamer tolerances, international tooling standard.