Overview
SIST EN ISO 1479:2011 is the European adoption of the international standard ISO 1479:2011, published by CEN. It specifies the characteristics and dimensions of hexagon head tapping screws with thread sizes ranging from ST 2.2 up to ST 9.5. These screws are designed primarily for metal fastening applications, offering reliable and standardized mechanical properties.
This standard ensures uniformity in the manufacturing, testing, and designation of hexagon head tapping screws, helping engineers, manufacturers, and quality controllers to achieve consistent product performance and interoperability. It supersedes the previous version, EN ISO 1479:1994, and incorporates the latest technical revisions to improve specification clarity and relevance.
Key Topics
- Scope: Defines the thread sizes covered (ST 2.2 to ST 9.5 inclusive) and the types of hexagon head tapping screws.
- Dimensions: Detailed in Table 1 of the standard, specifying critical parameters such as pitch, head size, thread diameter, and length tolerances.
- Types:
- Type C (cylindrical)
- Type F (flat)
- Type R (rounded end)
- Materials: Standards reference key materials such as:
- Steel (per ISO 2702 for heat-treated steel tapping screws)
- Stainless steel (per ISO 3506-4)
- Mechanical Properties: Specifications include hardness classes and product grades in accordance with ISO 2702 and ISO 3506-4.
- Thread Specifications: According to ISO 1478, which defines the tapping screw thread profile and dimensions.
- Finishes and Coatings:
- Electroplated coatings as per ISO 4042
- Zinc flake coatings following ISO 10683
- Passivation treatments conform to ISO 16048 for corrosion resistance
- Tolerances and Acceptability:
- Designation System: Includes thread size, nominal length, material type, and the screw type (C, F, or R), e.g.,
Tapping screw ISO 1479 - ST 3.5 × 16 - A4-20H - R
Applications
Hexagon head tapping screws conforming to SIST EN ISO 1479:2011 are widely utilized in various industries requiring secure fastening solutions for metal components, including but not limited to:
- Automotive Manufacturing: Assembly of vehicle panels and components.
- Electrical Equipment: Fastening enclosures and frames.
- Construction: Installation of metal fixtures and supports.
- Machinery and Industrial Equipment: Assembly and maintenance of metal parts.
- Metalworking: General sheet metal fastening where reliable tapping screws are essential.
By adhering to this standard, manufacturers and users can ensure:
- Uniform thread engagement and mechanical performance.
- Compatibility with existing fasteners and tools.
- Enhanced durability through proper material selection and coatings.
- Facilitated quality control and inspection processes.
Related Standards
SIST EN ISO 1479:2011 references and harmonizes with several other key international standards to ensure comprehensive coverage of fastener properties:
- ISO 225 – Symbols and dimension descriptions for fasteners.
- ISO 1478 – Thread profiles for tapping screws.
- ISO 2702 – Mechanical properties of heat-treated steel tapping screws.
- ISO 3269 – Acceptance inspection criteria for fasteners.
- ISO 3506-4 – Mechanical properties of stainless-steel tapping screws.
- ISO 4042 – Electroplated coatings on fasteners.
- ISO 4759-1 – Tolerances for bolts, screws, and nuts.
- ISO 8992 – General requirements for bolts, screws, studs, and nuts.
- ISO 10683 – Zinc flake coatings for corrosion protection.
- ISO 16048 – Passivation of stainless-steel fasteners.
Adopting SIST EN ISO 1479:2011 facilitates the use of hexagon head tapping screws that meet stringent international specifications, enhancing product reliability and interchangeability for industrial and commercial applications worldwide.
