ISO7380 Hexagon Socket Button Head Screws
ISO 7380 Hexagon Socket Button Head Screws are chosen when the fastening point needs to remain functional without giving the assembly the pronounced appearance of a conventional hexagon head or tall socket head. Their rounded button head creates a smoother transition above the surface of the component, while the recessed hexagon socket keeps the drive interface within the head rather than adding an external tool profile. The result is a fastening point that combines a finished appearance with straightforward mechanical installation.
The shape of the button head also makes ISO 7380 different from a standard cylindrical socket head cap screw. Instead of relying on a taller head for heavy-duty clamping, the design provides a compact, rounded head suited to exposed joints, panels, covers, brackets, guards, and assembled components where the fastener remains visible after installation. The internal hexagon drive allows the screw to be tightened from the head, while the standardized geometry provides consistent fit and repeatable assembly across production batches. Material selection allows the same button head design to be adapted to different service conditions. Carbon or alloy steel versions can be selected for general mechanical assemblies where strength and cost are important, while stainless steel versions are suitable when the fastening point is exposed to moisture or corrosive surroundings. This combination of a rounded external profile, recessed drive, and standardized construction makes ISO 7380 a useful option when both the mechanical function and finished appearance of the fastening point matter.
Specification:
ISO 7380 Hexagon Socket Button Head Screws are specified by the geometry of the button head, internal hexagon drive, threaded shank, and applicable dimensional requirements. The rounded head profile determines the external envelope of the fastener, while the internal hexagon size defines the compatible installation tool. The threaded portion is produced to the specified metric thread dimensions to ensure compatibility with standard mating threads.
For different mechanical and environmental requirements, ISO 7380 screws can be supplied in carbon steel, alloy steel, or stainless steel grades. Common steel property classes include 8.8, 10.9, and 12.9, while stainless steel options such as A2-70 and A4-70 can be selected where corrosion resistance is required. Depending on the material and application, surface finishes may include plain, black oxide, zinc plating, zinc flake, or other specified coatings. Diameter, length, head dimensions, socket size, material grade, and finish can be controlled according to the applicable ISO specification and customer requirements.
| Item | Specification |
|---|---|
| Standard | ISO7380 |
| Product Type | Hexagon Socket Button Head Screw |
| Head Type | Button Head |
| Drive | Internal Hexagon Socket |
| Thread Type | Metric Coarse |
| Thread | M3-M16 |
| Material | Carbon Steel,Alloy Steel,Stainless Steel |
| Surface Treatment | Plain,Black Oxidation,Zinc Plated,Dacromet,Hdg,Bright Finish,Passivation |
Dimension Chart of ISO7380 Hexagon Socket Button Head Screws:
The ISO 7380 dimension chart provides the key measurements needed to select the appropriate button head screw for a specific joint. The nominal diameter and screw length determine the threaded engagement, while the head diameter and head height define the amount of space occupied above the assembled surface. These dimensions are particularly relevant when the screw head remains exposed and its external profile forms part of the finished assembly.
Key dimensions include the nominal thread diameter (d), screw length (l), button head diameter (dk), head height (k), and internal hexagon socket size (s). The socket dimensions should be checked against the selected Allen key or hex bit, while the head diameter and height can be compared with the surrounding component geometry to prevent interference. Reviewing these dimensions together allows engineers and purchasers to select an ISO 7380 screw that provides suitable thread engagement, correct tool compatibility, and an appropriate finished head profile.
| Thread Diameter | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M16 |
| P | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 |
| da max | 3.6 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 17.7 |
| dk max | 5.7 | 7.6 | 9.5 | 10.5 | 14 | 17.5 | 21 | 28 |
| dk min | 5.4 | 7.24 | 9.14 | 10.07 | 13.57 | 17.07 | 20.48 | 27.48 |
| e min | 2.303 | 2.873 | 3.443 | 4.583 | 5.723 | 6.863 | 9.149 | 11.429 |
| k max | 1.65 | 2.2 | 2.75 | 3.3 | 4.4 | 5.5 | 6.6 | 8.8 |
| k min | 1.4 | 1.95 | 2.5 | 3 | 4.1 | 5.2 | 6.24 | 8.44 |
| r min | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 |
| s max | 2.08 | 2.58 | 3.08 | 4.095 | 5.14 | 6.14 | 8.175 | 10.175 |
| s min | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 | 10.025 |
| t min | 1.04 | 1.3 | 1.56 | 2.08 | 2.6 | 3.12 | 4.16 | 5.2 |
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Application of ISO7380 Hexagon Socket Button Head Screws:
Exposed Fastening Points with a Rounded Profile
ISO 7380 button head screws are well suited to assemblies where the fastener remains visible after installation and a rounded, unobtrusive head is preferred. They can be used for equipment covers, access panels, machine guards, mounting plates, fabricated brackets, and protective structures. The rounded head reduces the visual prominence of the fastening point compared with conventional hexagon head bolts, while the recessed hexagon drive maintains a practical installation method.
Small Components and Precision Assemblies
Smaller ISO 7380 sizes can be selected for instrument frames, camera mounts, laboratory equipment, display structures, compact mechanisms, and electronic mounting components. These applications often require a relatively compact fastening point without the external corners of a conventional bolt head. Screw length should be selected according to the thickness of the joined components and the required thread engagement.
Mechanical Fixtures and Moving Components
Medium and larger sizes are suitable for tooling fixtures, adjustable brackets, conveyor components, machine guards, mechanical linkages, furniture mechanisms, and equipment frames. The button head provides a smooth external profile on components that may be handled, adjusted, or positioned during normal operation. Higher-strength versions can be selected when the joint is subjected to greater tensile or clamping loads.
High-Strength Mechanical Applications
For connections where mechanical performance is more important than corrosion resistance, 8.8, 10.9, and 12.9 property classes can be selected according to the joint requirements. These grades can be used in tooling plates, clamping mechanisms, die and mold components, mechanical adjustment systems, heavy-duty brackets, and industrial fixtures. The required property class should be determined from the applied load, preload, joint design, and base material rather than from screw diameter alone.
Stainless Steel Applications
A2-70 stainless steel ISO 7380 screws are suitable for general moisture-exposed assemblies, including commercial equipment, outdoor fixtures, food-service fittings, and stainless steel fabrications. Where greater resistance to chloride-containing or marine environments is required, A4-70 can be considered for applications such as marine fittings, coastal equipment, chemical-service assemblies, and outdoor structures.
Products Where the Fastener Remains Accessible
The button head design is also useful on products where the fastening point may be frequently handled or seen by the end user. Examples include adjustable furniture hardware, sports equipment frames, display fixtures, access hardware, recreational equipment, and mobile equipment assemblies. In these applications, the rounded head provides a more suitable external profile while the internal hexagon socket allows straightforward tightening and maintenance.