Overview
ISO 4028:2026 specifies the characteristics for hexagon socket set screws with dog point, providing essential requirements for design, dimensions, mechanical properties, tolerances, and marking. This standard covers set screws with metric coarse pitch threads, ranging from M1.6 to M30 for steel fasteners and M1.6 to M24 for stainless steel fasteners. The screws are manufactured to product grade A and are not intended for use under tensile load. Where additional material or dimensional specifications are needed, these can be selected from referenced ISO standards such as ISO 898-5, ISO 3506-3, ISO 888, ISO 965-1, or ISO 4753.
Key Topics
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Product Scope:
- Hexagon socket set screws with dog point
- Thread sizes: M1.6–M30 (steel), M1.6–M24 (stainless steel)
- Product grade A
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Material and Mechanical Properties:
- Material options include steel and corrosion-resistant stainless steel
- Hardness classes and grades may be defined per ISO 898-5 (steel) or ISO 3506-3 (stainless steel)
- Not intended for tensile loading applications
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Dimensional Requirements:
- Specific dimensions for lengths, thread pitch, and dog point profiles
- Reference to ISO 225 for symbols and descriptions of dimensions
- Dimensional tolerances in accordance with ISO standards
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Surface and Finish Options:
- Steel fasteners: as processed, electroplated coatings per ISO 4042, or zinc flake coating per ISO 10683
- Stainless steel fasteners: clean and bright or passivated finishes
- Additional finishes, coatings, or requirements by agreement between purchaser and supplier
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Marking and Labelling:
- Product marking is optional, based on agreement
- Mandatory labelling for packaging, including reference to ISO 4028, size, grade, finish, manufacturer, lot number, and quantity
Applications
Hexagon socket set screws with dog point are widely utilized across various industrial sectors for secure, precise locating and locking of components without imposing tensile stress. Key application areas include:
- Machine building and assembly: Used for axial or radial positioning of parts, retaining collars, gears, and pulleys on shafts, or serving as permanent stops.
- Automotive and transportation: Effective in assemblies where precise part location and vibration resistance are crucial.
- Industrial equipment and furniture: Applied where non-protruding fastening and repeatable positioning are needed.
By specifying ISO 4028-compliant set screws, manufacturers and design engineers ensure compatibility, interchangeability, and reliability in critical assemblies, as well as clarity in procurement and quality assurance processes.
Related Standards
To complement ISO 4028:2026, several additional international standards provide further detailed requirements for fastener design, material properties, and quality:
- ISO 898-5: Mechanical properties for steel set screws
- ISO 3506-3: Mechanical properties for stainless steel fasteners
- ISO 888: Nominal and thread lengths for bolts, screws, and studs
- ISO 965-1: Thread tolerance principles and data
- ISO 4753: Ends of externally-threaded parts
- ISO 4042: Electroplated coating systems for fasteners
- ISO 10683: Non-electrolytically applied zinc flake coating systems
- ISO 8991: Designation system for fasteners
- ISO 8992: General fastener requirements
- ISO 6157-1: Surface discontinuities and integrity
- ISO 3269: Acceptance inspection for fasteners
Adhering to ISO 4028 and related standards supports standardization, efficient sourcing, and global interoperability in fastener applications.