ISO 2351-2:2002

Overview

ISO 2351-2:2002 is an international standard established by the International Organization for Standardization (ISO) that specifies technical requirements for machine-operated screwdriver bits designed for cross-recessed head screws. These screws are commonly used across various industries for assembly purposes due to their reliable engagement and torque transmission capabilities.

This part of the ISO 2351 series focuses exclusively on screwdriver bits compatible with cross-recessed screw heads, including Phillips (PH) and Pozidriv (PZ) types, ensuring standardized dimensions, drive methods, and performance criteria. It applies specifically to bits with male hexagon drives or cylindrical flat end drives as defined in ISO 1173, as well as to screwdriver tips per ISO 8764-1.

By adhering to ISO 2351-2, manufacturers and users can ensure compatibility, performance, and safety in machine-operated screw fastening applications involving cross-recessed screws.

Key Topics

• Scope and Application
  ISO 2351-2 covers machine-operated screwdriver bits intended for cross-recessed head screws and defines their dimensional and mechanical specifications. The standard supports bits with male hexagon or cylindrical flat end drives that engage with assembly equipment.

• Dimensions and Combinations
  The standard details recommended combinations between screwdriver tips (PH and PZ forms) and driver ends conforming to ISO 1173, providing guidance on proper matching to optimize torque transmission and fit. This harmonization ensures reduced wear and increased tool durability.

• Technical Requirements
  All bits require comprehensive heat treatment to meet durability standards. ISO 2351-2 aligns technical characteristics of bits with those of screwdriver tips specified in ISO 8764-1, ensuring uniform quality in terms of size, shape, and hardness.

• Torque Testing
  Bits undergo torque testing following the protocols set in ISO 8764-1, confirming their ability to transmit adequate torque without failure, which is critical for assembly line performance and screw joint integrity.

• Marking and Identification
  To ensure traceability and correct usage, bits must be permanently marked with the manufacturer’s name, tip form (PH or PZ), and size designation, supporting quality control and inventory management.

Applications

• Industrial Assembly Lines
  ISO 2351-2 standardized screwdriver bits are essential for automated screwdriving equipment used in mass production and assembly processes across automotive, electronics, appliance manufacturing, and aerospace sectors.

• Maintenance and Repair Operations
  The standardized bits allow maintenance technicians to replace and interchange tools efficiently, reducing downtime and ensuring consistent screw fastening quality.

• Tool Manufacturing
  Manufacturers of machine-operated screwdriver bits utilize ISO 2351-2 to design products that meet international compatibility and quality standards, facilitating access to global markets.

• Quality Assurance
  Companies adopt ISO 2351-2 to establish procurement specifications and quality benchmarks for screwdriver bits, enhancing operational reliability and reducing the risk of screw or tool damage.

Related Standards

• ISO 1173 – Specifies dimensions and drive ends for hand- and machine-operated screwdriver bits, ensuring compatibility of the drive mechanism.

• ISO 8764-1 – Details screwdriver tips for cross-recessed head screws, establishing form and size criteria for Phillips and Pozidriv tips.

• ISO 2351-1 – Covers machine-operated screwdriver bits for slotted head screws, complementing part 2 by addressing another common screw type.

• ISO 2351-3 – Specifies screwdriver bits for hexagon socket screws, rounding out the ISO 2351 series for various screw head configurations.

• ISO 1703 – Provides nomenclature and terminology related to assembly tools for screws and nuts, supporting consistent communication in industry.

Adopting ISO 2351-2:2002 ensures that machine-operated screwdriver bits for cross-recessed screws meet recognized international quality and dimensional standards. This facilitates efficient screwdriving operations, enhances tool durability, and optimizes assembly accuracy in industrial applications globally.