Overview
ISO 225:2010 - Fasteners: Bolts, screws, studs and nuts - Symbols and descriptions of dimensions defines the standardized symbols and descriptions of dimensions used to represent common fasteners. The publication provides these definitions in English, French and Russian for direct use in product standards and engineering drawings, and gives equivalent terms in Chinese, German, Italian, Japanese, Spanish and Swedish. Illustrative figures are included as examples only.
This standard helps ensure consistent dimension notation and multilingual terminology across design, manufacturing and documentation for fasteners such as bolts, screws, studs and nuts.
Key topics and technical scope
- Standardized symbols for dimensional features of fasteners (heads, shanks, threads, points, etc.).
- Descriptions of dimensions applicable to a wide range of fastener types rather than specific size tables.
- Coverage of many product forms, including:
- Hexagon head bolts and screws (with and without flange)
- Hexagon socket, hexalobular (Torx) and other socket head screws
- Slotted and cross‑recessed head screws; cup head and square neck bolts
- Studs, set screws and headless/partial‑shank screws
- Thread types and special ends (points), plus thread‑forming, thread‑cutting, tapping and drilling screws
- Nuts: hexagon, prevailing‑torque and slotted/castle styles
- Multilingual terminology for consistent labeling in international documentation.
- Figures provided as examples only - the standard specifies symbols/terms rather than prescribing manufacturing dimensions.
Practical applications and users
ISO 225:2010 is intended for use in:
- Mechanical and product designers preparing engineering drawings and CAD models
- Technical writers and documentation teams creating multilingual specification sheets
- Fastener manufacturers and suppliers standardizing product catalogs and labels
- Quality, procurement and compliance teams referencing standard terminology in contracts
- Standards committees and technical libraries aligning product standards with common symbols
Benefits include improved clarity in drawings, reduced ambiguity in international procurement, and consistent cross‑language communication of fastener dimensions.
Related standards
- ISO 225:2010 is intended to be referenced by product standards and technical drawings for fasteners. For complete dimensional or strength requirements, consult specific ISO fastener product standards and thread standards used in design and manufacturing.
Keywords: ISO 225, ISO 225:2010, fasteners, bolts, screws, studs, nuts, symbols, dimensions, engineering drawings, multilingual terminology, fastener standards.