Overview
ISO 7048:2011 is an International Standard developed by the International Organization for Standardization (ISO) that specifies the characteristics of cross-recessed cheese head screws. These screws belong to product grade A, covering thread sizes from M2.5 to M8 inclusive. The standard defines the precise dimensions and properties of screws featuring cross recesses of types H and Z. The design of these screws ensures compatibility with specific tooling and mechanical demands in various industrial applications.
This standard replaces the earlier edition ISO 7048:1998 with minor revisions and is essential for manufacturers, engineers, and purchasers seeking consistency and quality in cheese head screws with cross recesses.
Key Topics
- Scope and Application: Specifies cross-recessed cheese head screws with threads ranging M2.5 to M8, product grade A, types H and Z cross recess.
- Dimensional Specifications: Detailed dimensions such as thread pitch, head height, head diameter, and recess penetration based on screw nominal size.
- Material and Mechanical Properties: Includes requirements for steel, stainless steel, and non-ferrous metal screws with defined property classes (e.g., 4.8 or A2-70).
- Tolerances and Thread Standards: Conformance to ISO 261 for metric screw threads and ISO 965-2 for size tolerances, ensuring interchangeability.
- Surface Finishes and Coatings: Electroplated coatings are specified in ISO 4042; additional zinc flake coatings as per ISO 10683; surface discontinuities are controlled per ISO 6157-1.
- Cross Recess Types: Defines two main types of cross recesses:
- Type H: Standard cross recess
- Type Z: Improved penetration and torque transmission
Applications
ISO 7048:2011 cross-recessed cheese head screws are widely used in manufacturing and assembly applications where secure fastening with high precision is required. Typical use cases include:
- Mechanical Engineering: Fastening components in machinery and equipment that demand reliable torque transmission and repeatable assembly.
- Electronics and Electrical Equipment: Compact screws for circuit boards and device enclosures where space and head profile are critical.
- Automotive Industry: Assembly of vehicle parts requiring standardized screws with consistent mechanical properties.
- Furniture and Fixtures: Durable fastening for metal and wooden components needing clean aesthetics due to the cheese head design.
- General Industrial Use: Anywhere a precise, robust cross-recessed screw is necessary for optimal fastening performance.
Related Standards
ISO 7048:2011 works in conjunction with the following related ISO standards:
- ISO 1207: Specifies slotted cheese head screws, which share identical head dimensions with ISO 7048 screws.
- ISO 261 & ISO 965-2: Define metric screw thread dimensions and tolerances that apply to the screws covered by ISO 7048.
- ISO 898-1 & ISO 3506-1: Outline mechanical properties for carbon steel/alloy and stainless steel fasteners, respectively.
- ISO 4757: Details specifications for cross recesses on screws.
- ISO 4042 & ISO 10683: Standards for electroplated and zinc flake coatings for corrosion resistance and surface protection.
- ISO 4759-1: Provides tolerance limits for fastener dimensions and product grades.
- ISO 3269: Acceptance inspection procedures for fasteners.
For special requirements not covered by ISO 7048, users can refer to the broader range of ISO fastener standards, ensuring compliance with industry best practices.
Keywords: ISO 7048, cross-recessed cheese head screws, cheese head screws, product grade A screws, ISO fastener standards, metric screws, thread size M2.5 to M8, cross recess type H, cross recess type Z, mechanical properties screws, ISO 1207, screw dimensions standards, electroplated coatings fasteners, zinc flake coatings screws, ISO technical committee.
