{"id":2799,"date":"2026-06-12T16:33:34","date_gmt":"2026-06-12T14:33:34","guid":{"rendered":"https:\/\/www.efsfasteners.com\/products\/screws\/industrial-bi-hexagonal-screws\/"},"modified":"2026-07-17T15:58:16","modified_gmt":"2026-07-17T13:58:16","slug":"industrial-bi-hexagonal-screws","status":"publish","type":"page","link":"https:\/\/www.efsfasteners.com\/en\/products\/screws\/industrial-bi-hexagonal-screws\/","title":{"rendered":"Industrial Bi-Hexagonal Screws"},"content":{"rendered":"

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

Industrial Bi-Hexagonal Screws<\/h1><\/div><\/div><\/div>
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Industrial 12-point screws, also known as double-hex screws or 12-point bolts, are fastening components designed for applications requiring high mechanical performance, tightening accessibility and long-term reliability.<\/p>\n

The distinctive feature of this type of fastener is the 12-point head, obtained by overlapping two hexagons. This configuration provides a greater number of tool engagement positions compared to traditional hex head screws, making assembly operations easier even in confined spaces or where components are positioned close together.<\/p>\n

12-point screws are particularly common in the Oil & Gas, energy, industrial plant engineering, high-pressure valve, turbine and offshore sectors, where the fastening system must ensure consistent performance under high loads, vibration and severe environmental conditions.<\/p>\n<\/div><\/div><\/div>

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Characteristics of 12-Point Screws<\/h2><\/div>

The geometry of the 12-point head is designed to combine high tightening torque with operational practicality. Compared to a traditional hex head, it offers better accessibility during assembly and reduces the rotation required to reposition the wrench.<\/p>\n

This feature is particularly useful in industrial valves, heat exchangers, turbines and process equipment, where the space available for maintenance operations may be limited.<\/p>\n

Star screws are frequently manufactured in high-strength alloy steels or in special materials intended for corrosive environments or high-temperature applications. Depending on the application, they can be produced with full or partial thread, standard or fine metric thread and fully customized geometries.<\/p>\n

In the most demanding sectors, property classes 10.9 and 12.9 are often used, as well as ASTM materials intended for energy and petrochemical plant engineering.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

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Industrial Applications of 12-Point Screws<\/h2><\/div>

12-point screws are used in many industrial sectors where the fastening system is a critical component for plant safety and operational continuity.<\/p>\n

In the Oil & Gas sector, they are used for tightening valves, flanges, pumping systems and equipment subject to high operating pressures. The ability to apply high tightening torques in confined spaces is one of the main advantages of this configuration.<\/p>\n

In the energy sector, they are used on turbines, generators, thermoelectric plants and equipment intended for energy production and distribution. In these contexts, material quality, raw material traceability and the availability of specific certifications become essential.<\/p>\n

Star screws are also used in the chemical, offshore, marine and heavy machinery industries, where mechanical strength and tightening reliability must be guaranteed over long periods of operation.<\/p>\n<\/div><\/div><\/div>

ISO, DIN and UNI Standards<\/h2><\/div>

12-point screws can be manufactured according to international dimensional standards or produced entirely to drawing according to the customer\u2019s specifications.<\/p>\n

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