{"id":2779,"date":"2026-06-12T15:49:17","date_gmt":"2026-06-12T13:49:17","guid":{"rendered":"https:\/\/www.efsfasteners.com\/products\/screws\/industrial-socket-head-cap-screws\/"},"modified":"2026-07-17T15:57:21","modified_gmt":"2026-07-17T13:57:21","slug":"industrial-socket-head-cap-screws","status":"publish","type":"page","link":"https:\/\/www.efsfasteners.com\/en\/products\/screws\/industrial-socket-head-cap-screws\/","title":{"rendered":"Industrial Socket Head Cap Screws"},"content":{"rendered":"

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PRODUCTS<\/a> | SCREWS<\/a><\/p>\n<\/div>

Industrial Socket Head Cap Screws<\/h1><\/div><\/div><\/div>
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Industrial socket head cap screws are used in applications requiring high tightening torque, assembly precision and reduced space requirements. Thanks to the recessed hex socket drive, they allow high tightening torques to be applied while maintaining a compact geometry, a feature particularly valued in the machinery, heavy-duty automotive, energy, railway and power transmission sectors.<\/p>\n

Compared to traditional hex head screws, socket head cap screws provide greater accessibility in confined spaces and better integration into complex mechanical assemblies. In addition to UNI, DIN and ISO standard versions, special made-to-drawing configurations are widely used, with fine threads, calibrated shanks, non-standard lengths, integrated locking systems and dedicated surface treatments.<\/p>\n

Socket head fasteners are used both in standardised assemblies and in special production, where aspects such as traceability, material certifications, dimensional inspections and consistent mechanical performance over time are essential.<\/p>\n

EFS supports standard and special supplies with certified materials of European origin, dedicated machining operations and quality controls for applications subject to high mechanical stress.<\/p>\n<\/div><\/div><\/div>

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Characteristics of Socket Head Cap Screws<\/h2><\/div>

Socket head cap screws are mainly used when the available space does not allow the use of traditional hex head screws, or when precise and repeatable tightening is required.<\/p>\n

The most common configuration is the hexagon socket head cap screw according to UNI 5931, DIN 912 and ISO 4762, widely used in the machinery, power transmission, heavy-duty automotive and machine tool sectors. This geometry allows high tightening torques and high reliability, even in applications subject to vibration and dynamic loads.<\/p>\n<\/div>

UNI 5931 Socket Head Cap Screws<\/h3><\/div>

UNI 5931 identifies hexagon socket head cap screws<\/a> with coarse thread. They are among the most widely used types in industrial mechanics thanks to their combination of high mechanical strength, ease of assembly and reduced space requirements.<\/p>\n

They are used in gearboxes, transmission assemblies, presses, automatic machines and heavy-duty automotive components.<\/p>\n<\/div>

UNI 5932 Fine-Thread Socket Head Cap Screws<\/h3><\/div>

UNI 5932 identifies hexagon socket head cap screws with fine metric thread.<\/p>\n

Fine thread is selected when more precise preload adjustment is required or when greater resistance to loosening caused by vibration and cyclic loads is needed. Thanks to the larger contact surface between the threads, this configuration helps improve tightening stability over time.<\/p>\n

UNI 5932 screws are used in mechanical transmissions, rotating assemblies, heavy-duty automotive applications and industrial applications subject to continuous dynamic stress.<\/p>\n<\/div>

Socket Head Cap Screws with Calibrated Shank<\/h3><\/div>

Versions with calibrated shank are used when the fastener also performs a centring function or transmits shear loads.<\/p>\n

This configuration is used in kinematic mechanisms, precision mechanical assemblies, shaft-hub connections, transmission systems and assemblies subject to high dynamic loads.<\/p>\n<\/div>

Countersunk Screws with Hexagon Socket<\/h3><\/div>

Countersunk screws with hexagon socket allow flush fastening and are used when the head must not interfere with moving components or functional surfaces.<\/p>\n

The main reference standards are:<\/p>\n