Overview
EN ISO 1580:2011 / ISO 1580:2011 specifies the characteristics of slotted pan head screws - product grade A with metric external threads from M1.6 to M10 inclusive. Adopted by CEN in 2011 (superseding EN ISO 1580:1994), the standard defines dimensions, materials, mechanical property classes and key acceptance/tolerance requirements for this common fastener type.
Key topics and technical requirements
- Scope and sizes: Covers slotted pan head screws with threads M1.6 to M10 and a range of nominal lengths; preferred lengths and thread-up-to-head rules are given (see Table 1 and figure in the standard).
- Dimensions and profiles: Head, shank and slot dimensions specified (symbols per ISO 225). The shank diameter is approximately equal to the pitch diameter or the permissible major thread diameter.
- Materials and property classes: Steel (property classes 4.8, 5.8), stainless steel (e.g. A2-50, A2-70) and non‑ferrous metals are referenced with applicable mechanical standards (ISO 898-1, ISO 3506-1, ISO 8839).
- Threads and tolerances: General metric thread references (ISO 261, ISO 965-2) and tolerance class 6g for external threads.
- Product grade and tolerances: Product grade A dimensions and tolerances per ISO 4759-1.
- Surface and coatings: Electroplating and surface finish requirements referenced (e.g. ISO 4042 for electroplated coatings, ISO 10683 for zinc flake coatings); surface discontinuity limits per ISO 6157-1.
- Inspection and acceptance: Acceptance inspection principles referenced to ISO 3269.
- Designation example: Pan head screw ISO 1580 - M5 × 20 - 4.8
Applications and who uses it
- Manufacturers and fastener suppliers use EN ISO 1580:2011 to produce slotted pan head screws that meet recognized dimensional, material and quality standards.
- Product designers and mechanical engineers rely on the documented dimensions, thread forms and property classes when specifying fasteners for assemblies.
- Quality inspectors and procurement teams reference the standard during incoming inspection, acceptance testing and supplier contracts.
- Typical industries: electronics, appliances, automotive subcomponents, machinery and general engineering where small to medium metric pan head screws are used.
Related standards
EN ISO 1580:2011 is a practical, widely adopted specification for ensuring compatibility, interchangeability and quality of slotted pan head screws in metric sizes (M1.6–M10).