Overview
SIST EN ISO 7045:2011 is an international standard developed by CEN and ISO that specifies the characteristics of pan head screws with type H or type Z cross recess, classified under product grade A. Covering thread sizes from M1,6 to M10 inclusive, this standard sets the detailed dimensions, mechanical properties, and tolerances essential for manufacturing and quality control of these screws. The standard ensures uniformity and interchangeability in fastener applications across various industries.
This standard supersedes the previous EN ISO 7045:1994 and aligns with related ISO standards governing fasteners, thread profiles, and material specifications. It is applicable in contexts where precise mechanical and surface requirements are crucial for fasteners to perform reliably.
Key Topics
- Screw Types: Defines pan head screws with two types of cross recess - type H and type Z - optimizing for torque application and screw driving efficiency.
- Product Grade A: Focuses on high-quality screws suitable for general-purpose fastening with strict tolerances on dimensions and finish.
- Thread Sizes: Covers metric threads from M1,6 up to M10 inclusive, with detailed dimensional tables for shank diameter, pitch, recess penetration, and head geometry.
- Mechanical Properties: Reference to ISO 898-1 for carbon steel screws and ISO 3506-1 for stainless steel screws regarding property classes, ensuring mechanical strength and corrosion resistance.
- Tolerance and Quality: Adheres to tolerance classes per ISO 4759-1 and limits for surface discontinuities as per ISO 6157-1 to guarantee consistency and reliability.
- Coatings and Finish: Defines requirements for electroplated coatings (ISO 4042), non-electrolytically applied zinc flake coatings (ISO 10683), and passivation of stainless steel screws (ISO 16048).
- Designation and Identification: Provides a clear system for screw identification to convey size, property class, and recess type in procurement and manufacturing.
Applications
SIST EN ISO 7045:2011 pan head screws with cross recess type H or Z are commonly used in:
- Electronics Assembly: Small-size screws (M1,6 to M4) facilitate precise fastening in compact electronic devices.
- Automotive Industry: Medium-sized screws (M5 to M10) deliver reliable assembly in vehicle components requiring high mechanical strength.
- Mechanical Engineering: Fasteners meeting strict dimensional and mechanical specs enable safe and efficient assembly in machinery and equipment.
- Consumer Goods Manufacturing: Standardized screws ensure consistent quality in household appliances and furniture.
- Corrosion-Resistant Fastening: Stainless steel screws per this standard comply with corrosion resistance requirements essential in outdoor or harsh environments.
The uniform specifications enable manufacturers and users to select screws that guarantee mechanical integrity, interchangeability, and quality assurance across different sectors.
Related Standards
SIST EN ISO 7045:2011 works in conjunction with several international standards for comprehensive fastener specification and quality control:
- ISO 261 & ISO 965-2: Define general purpose metric screw thread dimensions and tolerances.
- ISO 898-1: Specifies mechanical properties for carbon and alloy steel fasteners.
- ISO 3506-1: Addresses mechanical properties of corrosion-resistant stainless steel fasteners.
- ISO 4757: Covers dimensions for cross recess types including H and Z.
- ISO 4759-1: Tolerance classes for bolts, screws, and nuts of different product grades.
- ISO 4042: Electroplated coating requirements for fasteners.
- ISO 10683: Guidelines for non-electrolytically applied zinc flake coatings.
- ISO 16048: Passivation treatment for stainless steel fasteners.
- ISO 6157-1: Surface discontinuity limits.
- ISO 3269: Acceptance inspection and quality evaluation.
By referencing these interconnected standards, SIST EN ISO 7045:2011 provides a solid framework ensuring that pan head screws with cross recess types H or Z meet global industry expectations for quality and performance.
Keywords: SIST EN ISO 7045:2011, pan head screws, type H cross recess, type Z cross recess, product grade A, metric screws, ISO fastener standards, screw dimensions, mechanical properties, stainless steel screws, tolerance class, fastener coatings, manufacturing standard, screw specifications.
