S-91280A571 M8 x 140 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
- Exceptional tensile strength with 110,000 psi rating for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in harsh environments
- Optimized thread engagement with partial threading and 22mm minimum thread length for secure fastening
- Precision Class 6h thread fit ensuring consistent mating with nuts and threaded components
- Heavy-duty Class 8.8 strength grade providing excellent load-bearing capacity for industrial use
- Standard-compliant design meeting ISO 4014, DIN 931 and SAE J1199 specifications for global compatibility
- External hex drive configuration enabling easy installation with common wrench tools
Professional Applications & Engineering Value
This M8 hex head screw delivers exceptional engineering value through its Class 8.8 steel construction and zinc plated finish, specifically engineered to address common industrial challenges. The coarse thread design with 1.25mm pitch provides superior resistance to vibration loosening in heavy machinery, construction equipment, and structural assemblies. The partially threaded configuration with precise 22mm minimum thread length ensures optimal stress distribution while preventing thread damage during installation. With Rockwell C21 hardness and 110,000 psi tensile strength, this metric fastener maintains integrity under extreme loads, making it ideal for automotive frames, industrial machinery, and structural steel connections where reliability is paramount.
Specification Summary & Compliance
This 140mm length hex head screw features precise Class 6h thread fit tolerance and M8 x 1.25mm coarse thread specifications compliant with ISO 4014, DIN 931, and SAE J1199 standards. The fastener meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety. Manufacturing follows ISO 898 mechanical property requirements for Class 8.8 strength grade fasteners, guaranteeing consistent performance across industrial applications.
