Overview
ISO 7575:1993 is an International Standard developed by ISO Technical Committee ISO/TC 22, Subcommittee SC 19, which focuses on road vehicle wheels. This standard specifies the essential dimensions of hexagon nuts with flat seats and captive washers designed for commercial road vehicles. It applies specifically to wheel fixing nuts used on flat attachment wheels for studs measuring 18 mm, 20 mm, and 22 mm. The standard ensures compatibility and interchangeability in fastening commercial vehicle wheels with flat attachments that center on a central bore as defined in ISO 4107.
By defining precise dimensions and tolerances, ISO 7575:1993 provides manufacturers, engineers, and maintenance professionals with reliable specifications for producing and selecting flat attachment wheel fixing nuts that guarantee fitment, safety, and performance.
Key Topics
- Standard Scope: Essential dimensions of flat seat hexagon nuts with captive washers for commercial vehicle wheel studs of 18 mm, 20 mm, and 22 mm diameters.
- Design Specifications: Includes detailed dimensional parameters such as width across flats, radial width of washer contact surface, overall washer height, and inner and outer washer diameters.
- Interchangeability: Dimensions ensure nuts can be reliably interchanged across commercial vehicle flat attachment wheels conforming to ISO 4107.
- Nut Technology Flexibility: While critical dimensions are standardized, the design of the nut relative to the washer remains manufacturer-dependent, allowing innovation around fastening performance and materials.
- Manufacturing Tolerances: Specifies dimensional tolerances to maintain uniformity in production and facilitate consistent assembly.
Applications
ISO 7575:1993 is crucial for industries involved in the manufacture, assembly, and maintenance of commercial road vehicles’ wheels. Common practical applications include:
- Commercial Vehicle Assembly: Ensures wheel fixing nuts meet dimensional standards to enable proper mounting of flat attachment wheels on trucks, buses, and other heavy vehicles.
- Automotive Component Suppliers: Assists fastener manufacturers in producing hexagon nuts and captive washers that comply with international requirements for commercial vehicles.
- Maintenance and Repair Operations: Provides guidelines to select correct replacement wheel nuts to maintain vehicle safety, proper wheel mounting, and compliance with regulatory standards.
- Quality Control: Enables inspectors to verify dimensions and tolerances during manufacturing and final inspection procedures, promoting consistent product quality.
- Design Engineering: Facilitates automotive designers in specifying wheel fixation components compatible with standardized fasteners for flat attachment wheels.
Related Standards
ISO 7575:1993 is interconnected with other ISO standards related to commercial vehicle wheels and fasteners, including:
- ISO 4107: Road vehicles – Wheels for commercial vehicles – Dimensional characteristics of attachment on hub. This standard defines the dimensional requirements for flat attachment wheels that ISO 7575 wheel fixing nuts are designed to secure.
- ISO 4014 / ISO 4017: General standards for hexagon bolts and screws that may relate to stud specifications for fastening applications.
- ISO 898 series: Mechanical properties of fasteners, often referenced to ensure strength and performance compliance.
- ISO 4759: Tolerances for fasteners, complementary in defining manufacturing and inspection limits.
Keywords: ISO 7575, flat attachment wheel fixing nuts, commercial road vehicles, hexagon nuts, captive washer, wheel studs, vehicle wheels fasteners, ISO 4107, automotive wheel nuts, commercial vehicle maintenance, fastener standards, wheel fixation nuts dimensions