S-91280A281 M8 x 55 mm ISO 4014, DIN 931 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
- Exceptional tensile strength of 110,000 psi ensures reliable performance in demanding industrial applications, reducing the risk of fastener failure.
- Class 8.8 steel construction provides superior durability and resistance to wear, extending the service life of your assemblies.
- Rockwell C21 hardness offers excellent resistance to deformation under load, maintaining structural integrity in high-stress environments.
- Partial threading design allows for precise clamping force control and reduces the risk of thread stripping in softer materials.
- External hex drive and 13mm head width facilitate easy installation and removal with standard tools, improving assembly efficiency.
- Coarse M8 x 1.25mm metric thread ensures quick engagement and reliable fastening in a variety of materials, minimizing installation time.
- Black finish and steel material provide good corrosion resistance for general industrial use, enhancing longevity in non-harsh environments.
Professional Applications & Engineering Value
This M8 hex head screw is engineered to address common industrial fastening challenges, such as vibration loosening and material fatigue. Made from Class 8.8 steel with a Rockwell C21 hardness, it withstands high tensile and shear stresses in machinery, automotive, and construction applications. The partial threading ensures optimal grip length, preventing over-torquing and distributing load evenly. With a coarse thread pitch of 1.25mm and external hex drive, it allows for rapid assembly in metals and composites, reducing downtime. Compliant with ISO 4014 standards, it guarantees dimensional accuracy and interchangeability, making it a trusted choice for heavy-duty fastening solutions where reliability is critical.
Specification Summary & Compliance
This screw features precise M8 x 1.25mm coarse threads with a Class 6g thread fit for consistent engagement and tolerance. It adheres to ISO 4014 (DIN 931) manufacturing specifications, ensuring uniformity and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in industrial supply chains.
