{"id":1815,"date":"2025-10-07T15:06:47","date_gmt":"2025-10-07T13:06:47","guid":{"rendered":"https:\/\/www.efsfasteners.com\/?post_type=avada_portfolio&p=1815"},"modified":"2025-10-07T15:46:45","modified_gmt":"2025-10-07T13:46:45","slug":"partially-threaded-hex-head-bolt-uni-5737-white-zinc-plated","status":"publish","type":"avada_portfolio","link":"https:\/\/www.efsfasteners.com\/en\/portfolio-items\/partially-threaded-hex-head-bolt-uni-5737-white-zinc-plated\/","title":{"rendered":"Partially threaded Hex Head Bolt UNI 5737 White Zinc Plated"},"content":{"rendered":"

The partially threaded hex head bolts UNI 5737<\/strong> (DIN 931) in Class 8.8 featured in this case study were supplied by EFS \u2013 European Fasteners Solutions according to the specific dimensions requested by the customer.
\nThese bolts are standard fasteners, frequently used in steel structures<\/strong>, industrial machinery and a wide range of structural assemblies.
\nIn this 420 mm length version, however, they fall within the category of extra-long<\/strong> components that require special care during manufacturing, inspection and handling.<\/p>\n

Hot forging and heat treatment<\/strong><\/h2>\n

These bolts were produced through hot forging<\/strong>, a process that ensures a dense and homogeneous metal structure while maintaining dimensional precision even on oversized lengths.<\/p>\n

After forging, each piece undergoes heat treatment<\/strong> (quenching and tempering) to achieve the mechanical properties defined by strength class 8.8<\/strong>, in full compliance with ISO 898-1 standards.<\/p>\n

This treatment provides the bolt with excellent toughness, tensile strength and load-bearing capacity\u2014essential characteristics for applications exposed to high stress or vibration.<\/strong><\/p>\n

White zinc electroplating<\/strong><\/h2>\n

The next step is white zinc electroplating, chosen to protect the bolt against oxidation and ensure long-term durability.
\nThis thin and uniform coating produces a bright and regular surface,<\/strong> reducing friction during assembly and improving the aesthetic finish of the component.<\/p>\n

White zinc plating is widely used in plant engineering and structural applications<\/strong>, especially where bolts remain visible or exposed to varying environmental conditions.<\/p>\n

Straightness inspection<\/strong><\/h2>\n

With a total length of 420 mm, even a slight deviation from the axis can compromise the performance of the joint.
\nFor this reason, each bolt undergoes a straightness inspection<\/strong> using precision gauges<\/strong> to verify the alignment between the head and the bolt end.
\nThe goal is to ensure that the axis remains perfectly co-axial, preventing any bending that could affect assembly accuracy or load distribution.<\/p>\n

This type of inspection is particularly important for extra-long bolts, <\/strong>where even minimal deviations are amplified along<\/strong> the length, directly impacting the quality of the final installation.<\/strong><\/p>\n

Explore all fasteners services <\/a>that EFS can deliver.<\/p>\n

Applications in structural and industrial fields<\/strong><\/h2>\n

An M10x420 bolt is typically used in industrial and structural environments requiring long, strong fasteners to connect thick materials.<\/p>\n

Some common applications include:<\/p>\n

    \n
  • Steel construction and metal frameworks<\/strong> \u2013 fastening beams, frames, uprights, and longitudinal elements.<\/li>\n
  • Macchinari e attrezzature industriali<\/strong>: unioni strutturali in presse, stampi o macchine utensili di grandi dimensioni.<\/li>\n
  • Industrial machinery and equipment<\/strong> \u2013 structural joints in presses, moulds, and large machine tools.<\/li>\n
  • Foundations and anchoring systems <\/strong>\u2013 tie rods and connections subjected to tension or bending.<\/li>\n
  • Bridges and metal infrastructures <\/strong>\u2013 joints between beams, decks, and stiffening elements.<\/li>\n<\/ul>\n

    A standard component with precision-level requirements<\/strong><\/h2>\n

    Although the UNI 5737 hex head bolt is a standard product, in the extra-long 420 mm version<\/strong> it becomes a precision-engineered component.<\/strong>
    \nEach production phase \u2013 from hot forging<\/strong> to heat treatment, <\/strong>followed by zinc plating<\/strong> and straightness inspection<\/strong> \u2013 contributes to ensuring the bolt\u2019s reliability and assembly safety.<\/p>\n

    For EFS, supplying fasteners like this is a tangible example of how even a standard component can be customised, controlled and certified<\/strong> to meet specific customer requirements, while maintaining high quality standards and full compliance with international regulations.<\/p>\n

    Partially threaded hex head screw UNI 5737 Technical Summary<\/strong><\/h2>\n
      \n
    • Reference standards: UNI 5737 \/ DIN 931<\/li>\n
    • Size: M10 \u00d7 420 mm<\/li>\n
    • Strength class: 8.8<\/li>\n
    • Material: quenched and tempered alloy steel<\/li>\n
    • Finish: white zinc electroplated<\/li>\n
    • Manufacturing process: hot forged<\/li>\n
    • Quality control: straightness verification with precision gauges<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

      The partially threaded hex head bolts UNI 5737 (DIN 931) in Class 8.8 featured in this case study were supplied by EFS \u2013 European Fasteners Solutions according to the specific dimensions requested by the customer.
      \nThese bolts are standard fasteners, frequently used in steel structures, industrial machinery and a wide range of structural assemblies.<\/p>\n","protected":false},"author":1,"featured_media":1806,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"portfolio_category":[27],"portfolio_skills":[],"portfolio_tags":[],"class_list":["post-1815","avada_portfolio","type-avada_portfolio","status-publish","format-standard","has-post-thumbnail","hentry","portfolio_category-plants"],"yoast_head":"\nPartially threaded hex head bolt UNI 5737 - EFS Srl European Fasteners Solutions<\/title>\n<meta name=\"description\" content=\"By EFS: M10x420 hex head bolts uni 5737 class 8.8, hot-forged and white zinc plated, tested for straightness and strength in structural applications.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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