What is an Allen screw and how does It work?
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An Allen screw, technically known as an internal hex screw or socket head cap screw, is a fastening element whose head incorporates a six-sided cavity on the inside. This geometry allows the Allen key to fit completely inside the screw, transmitting force in a distributed and secure manner.
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Hexagonal geometry: The key to its superiority<\/h3>\n\n\n\n
Unlike slotted or Phillips screws, where the tool contacts the surface tangentially, the Allen key wraps around all six sides of the internal cavity. This means force is distributed evenly, the risk of slipping is minimized, and the screw head withstands much more torque without deteriorating.
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- Higher torque:<\/strong> The hexagonal geometry allows reaching torsion values that other profiles cannot sustain.
<\/li>\n\n\n\n- No lateral slipping:<\/strong> The key is retained inside the hexagon, making the slippage that ruins other heads impossible.
<\/li>\n\n\n\n- Low, compact profile:<\/strong> The head does not protrude excessively, allowing use in very tight spaces.
<\/li>\n\n\n\n- Clean appearance:<\/strong> Ideal for visible assemblies where aesthetics also matter.<\/li>\n<\/ul>\n\n\n\n
<\/div>\n\n\n\nTypes of Allen screws by head<\/h2>\n\n\n\n
Not all Allen screws are the same. The variety of available heads allows this type of fastener to be adapted to virtually any technical or aesthetic need. Knowing the types of Allen screws is essential for choosing the right one for each project.
<\/p>\n\n\n\n\n\nCylindrical Head (Socket)<\/h3>\n\n\n\n
This is the most widely used model. Its cylindrical head, slightly wider than the shank, provides a very firm fastening. Standardized under DIN 912 and ISO 4762, it is the preferred choice in industrial machinery, robotics, and metal structures where high mechanical resistance is required.
<\/p>\n<\/div>\n\n\n\n\n![\"Cylindrical](\"https:\/\/estampacionenfrio.com\/wp-content\/uploads\/2026\/05\/Tornillo-Allen-cabeza-cilindrica-Socket.jpg\")
<\/figure>\n<\/div><\/div>\n<\/div>\n\n\n\n\n\n\n![\"\"](\"https:\/\/estampacionenfrio.com\/wp-content\/uploads\/2026\/05\/Tornillo-Allen-tipo-cabeza-de-boton-Button-Head.jpg\")
<\/figure>\n<\/div><\/div>\n\n\n\n\nButton Head<\/h3>\n\n\n\n
With a rounded, low profile, this variant eliminates sharp edges. It is recommended in areas with pedestrian traffic, conveyor belts, or any application where a protrusion could pose a snagging or injury hazard.
<\/p>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n\n\nFlat or Countersunk Head
<\/h3>\n\n\n\nDesigned to sit completely flush with the surface once installed. It is the perfect choice for electronic equipment, medical devices, metal carpentry, and any application where a smooth profile is essential. Standardized under ISO 10642 and DIN 7991.
<\/p>\n<\/div>\n\n\n\n\n![\"\"](\"https:\/\/estampacionenfrio.com\/wp-content\/uploads\/2026\/05\/Gemini_Generated_Image_vuai0bvuai0bvuai.jpg\")
<\/figure>\n<\/div><\/div>\n<\/div>\n\n\n\n\n\n\n![\"Set](\"https:\/\/estampacionenfrio.com\/wp-content\/uploads\/2026\/05\/Tornillo-Allen-tipo-Prisionero-o-tornillo-sin-cabeza.jpg\")
<\/figure>\n<\/div><\/div>\n\n\n\n\nSet Screw (Headless)<\/h3>\n\n\n\n
A fully threaded rod with the internal hex at one end. It is used to secure internal parts against a shaft, such as pulleys, gears, or couplings. Very common in the food industry and in high-temperature applications. <\/p>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
\n\n\nShoulder Screw
<\/h3>\n\n\n\nFeatures a smooth, precision-ground section between the head and the thread. This section allows rotational or sliding movement of another part, functioning as a precision shaft or pin. Used in linear guides, actuators, and positioning systems. <\/p>\n<\/div>\n\n\n\n
\n![\"Shoulder](\"https:\/\/estampacionenfrio.com\/wp-content\/uploads\/2026\/05\/Tornillo-Allen-tipo-hombro-o-guia.jpg\")
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Need help?<\/strong><\/p>\n\n\n\n
Contact our technical office<\/strong> and tell us about your project.<\/p>\n\n\n\n
We will study your case and propose a solution to manufacture them.<\/p>\n\n\n\n
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- No lateral slipping:<\/strong> The key is retained inside the hexagon, making the slippage that ruins other heads impossible.