S-91280A548 M8 x 55 mm ISO 4014, DIN 931, SAE J1199, ISO 898 Medium-Strength Metric Class 8.8 Steel Hex Head Screws
Medium-Strength Metric Class 8.8 Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc plating, extending service life in demanding industrial environments
- High tensile strength of 110,000 psi ensures reliable performance under heavy loads and vibration
- Class 8.8 strength grade provides excellent mechanical properties for critical structural applications
- External hex drive design allows for easy installation and removal with standard tools
- Coarse thread pitch (1.25mm) enables faster assembly and better performance in softer materials
- Partial threading offers optimal grip length while reducing material costs
- Rockwell C21 hardness maintains thread integrity and prevents stripping during installation
Professional Applications & Engineering Value
This M8 hex head screw delivers exceptional engineering value across industrial applications where reliability is paramount. The Class 8.8 steel construction combined with zinc plating addresses common challenges of structural integrity and environmental corrosion in machinery assembly, construction frameworks, and equipment manufacturing. The metric coarse threading provides superior holding power in steel-to-steel connections while the external hex drive ensures secure tool engagement during high-torque installations. With partial threading optimizing the fastener's grip range, engineers can achieve precise clamping force distribution while minimizing weight and material usage in heavy-duty applications requiring high tensile strength and consistent performance.
Specification Summary & Compliance
This fastener maintains Class 6h thread fit tolerance and meets multiple international standards including ISO 4014, DIN 931, and SAE J1199. The manufacturing specifications adhere to ISO 898 mechanical properties requirements. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and material sustainability for global industrial applications.
