Overview
EN ISO 7048:2011 specifies the standardized characteristics of cross-recessed cheese head screws belonging to product grade A. These screws accommodate metric thread sizes ranging from M2.5 up to M8 inclusive and feature cross recess types H and Z. Developed by ISO Technical Committee ISO/TC 2 in collaboration with CEN/TC 185, this standard ensures interchangeability, quality, and performance consistency across manufacturing and industrial applications.
Cross-recessed cheese head screws combine the precision of metric threading with specialized head designs, making them essential components in mechanical assemblies requiring reliable fastening and easy screwdriver access. This standard supersedes EN ISO 7048:1998 and aligns with corresponding European and international fastener regulations.
Key Topics
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Scope and Specification
Defines dimensions, mechanical properties, and cross recess types for cheese head screws. The screws have cylindrical heads with cross-shaped slots enabling drivers of types H and Z for optimal torque transfer.
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Dimensions and Tolerances
Provides detailed dimensional tables specifying screw lengths, thread pitches, head heights, and recess penetration depths. It references ISO 225 for dimension symbols and includes tolerances per ISO 4759-1 ensuring accurate manufacturing.
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Material and Mechanical Properties
Supports screws made from steel, stainless steel, and non-ferrous metals, referencing ISO 898-1 and ISO 3506-1 for property classes like 4.8 and A2-70. The standard ensures torsional strength and performance in typical engineering environments.
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Surface Treatments and Coatings
Specifies electroplating requirements according to ISO 4042 and optional non-electrolytical zinc flake coatings per ISO 10683. Surface integrity controls follow ISO 6157-1 and acceptability inspections per ISO 3269.
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Designation Guidelines
Details standardized screw designation to include thread size, length, property class, and cross recess type-for example, "Cheese head screw ISO 7048 - M5 × 20 - 4.8 - Z" to clearly communicate specifications.
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Referenced Standards
Integrates related international standards such as ISO 261 (thread general plan), ISO 965-2 (thread tolerances), ISO 4757 (cross recesses), and ISO 8992 (general fastener requirements) to provide comprehensive technical coverage.
Applications
EN ISO 7048 cross-recessed cheese head screws are widely used in:
- Automotive assembly where consistent torque and reliable fastening are critical.
- Electronics and electrical appliances requiring compact screw heads with efficient driver engagement.
- Machinery manufacturing for components subject to vibration and dynamic loading.
- Construction and cabinetry where standardized fasteners simplify maintenance and replacements.
- Precision engineering sectors such as instrumentation and robotics relying on standardized screw dimensions and mechanical properties.
These screws facilitate assembly with cross-recessed drivers, reduce cam-out risk, and maintain aesthetic consistency thanks to their cheese head profile.
Related Standards
- ISO 1207 - Slotted cheese head screws dimensions similar to EN ISO 7048 but with a single slot recess.
- ISO 4757 - Specifies cross recess types for screws, critical for matching driver tools.
- ISO 898-1 - Mechanical properties of bolts and screws made from carbon and alloy steel.
- ISO 3506-1 - Properties for stainless steel fasteners suitable for corrosion resistance.
- ISO 4042 - Electroplated coating requirements ensuring corrosion protection.
- ISO 10683 - Non-electrolytically applied zinc flake coatings for enhanced durability.
Keywords
Cross-recessed cheese head screws, EN ISO 7048, metric screws M2.5 to M8, product grade A screws, cross recess type H and Z, standardized fasteners, mechanical properties, electroplated coating screws, screw dimensions, ISO fastener standards, precision fastening solutions.