Overview
ISO 9259:1991 - "Passenger cars - Windscreen wiper systems - Wiper arm-to-blade connections" defines the main dimensions and general requirements for the mechanical connections between wiper arms and blades used on passenger cars. The standard covers preferred hook types (A1, A2), alternative connection types (Terel, pin-on-blade, pin-on-arm, twin‑screw) and includes Annex A (normative) with additional connection sizes in current use. It applies primarily to passenger cars but may be used for other vehicles when no specific standard exists. Details not specified in the standard are left to the manufacturer’s choice.
Key Topics and Requirements
- Connection types specified
- Hook connection (preferred) - Types A1 and A2 for nominal arm sizes 8 mm × 3 mm and 9 mm × 3 mm.
- Terel connection
- Pin-on-blade and pin-on-arm connections
- Twin‑screw connection
- Annex A lists non‑preferred hook sizes (B1, B2, B3) and additional dimensions for C, D and E types.
- Dimensional requirements
- Main hook and blade opening dimensions are given by figures and tables in the standard (manufacturer to follow specified drawings).
- For certain designs, the standard requires it to be possible to insert a cylinder of 6.7 mm diameter (rotational-axis clearance). Some Annex A types reference a 5 mm cylinder requirement.
- Functional requirements
- Clips for hook‑type connections shall latch positively with the arm.
- The lateral angular movement between blade assembly and arm shall not exceed the limit shown in the standard (measured between the arm and the blade main lever).
- The torque required to rotate the blade about its rotational axis on the arm must not exceed 0.1 N·m, ensuring free movement under vehicle operation.
- For specially driven wiper systems, additional fastening means are required beyond the standardized connections.
- Manufacturer discretion
- Any details not defined by ISO 9259 are left to the manufacturer’s choice; preferred types A1/A2 should be mutually agreed with the user.
Applications and Users
- Automotive OEMs and suppliers designing and producing wiper arms and blades
- Aftermarket wiper blade manufacturers and distributors
- Vehicle design and body engineers integrating wiper systems
- Test laboratories and quality engineers verifying dimensional conformity and functional torque/clearance
- Regulatory bodies and procurement teams specifying compatible wiper interfaces
Related Standards
- Prepared by ISO/TC 22 (Road vehicles), Subcommittee SC 3 (Electrical equipment). For full system requirements, consult other ISO standards for complete windscreen wiper system performance and vehicle-specific regulations.
Keywords: ISO 9259:1991, windscreen wiper arm-to-blade connections, wiper arm hook dimensions, wiper blade connection standards, passenger car wiper systems.
