S-91280A798 M14 x 120 mm ISO 4014, DIN 931, ISO 898 Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 110,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Class 8.8 strength grade provides a robust balance of strength and ductility, ideal for general engineering and construction uses.
• Zinc plating finish offers excellent corrosion resistance, extending the screw's service life in various environmental conditions.
• Partially threaded design allows for secure clamping on unthreaded sections, improving joint stability and vibration resistance.
• Coarse metric thread (M14x2mm) enables quicker installation and reduced cross-threading risks, saving time during assembly.
• External hex drive and hex head facilitate easy installation and removal with standard tools, enhancing maintenance efficiency.
• Rockwell C21 hardness ensures good wear resistance and durability under mechanical stress, supporting long-term use.

Professional Applications & Engineering Value

This M14 hex head screw is engineered from Class 8.8 steel to address common industrial challenges such as joint loosening and corrosion in heavy machinery, structural frameworks, and automotive assemblies. The partially threaded configuration ensures that the unthreaded shank bears shear loads effectively, while the coarse thread with 2mm pitch provides strong holding power in brittle materials or high-vibration environments. The zinc-plated surface treatment combats rust, making it suitable for outdoor or humid conditions. By conforming to ISO 4014 and DIN 931 standards, it guarantees dimensional accuracy and interchangeability, reducing downtime and replacement costs in industrial and construction projects.

Specification Summary & Compliance

This fastener adheres to precise metric dimensions, including a thread size of M14 with a coarse pitch of 2mm, thread fit of Class 6h for standard tolerance, and a length of 120mm with a minimum thread length of 34mm. It meets manufacturing specifications per ISO 4014, DIN 931, and ISO 898, ensuring consistent quality and performance. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various markets without hazardous substances.