S-91274A121 M4 x 20 mm ASTM B117, DIN 912, ISO 4762 Alloy Steel Socket Head Screws
Alloy Steel Socket 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 strength and durability with Class 12.9 rating and 170,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments
- Precise torque transmission through 3mm hex socket drive, preventing tool slippage and ensuring secure fastening
- Optimal thread engagement with Class 5g6g thread fit and coarse 0.7mm pitch for quick assembly and vibration resistance
- Consistent dimensional accuracy maintained through full compliance with ISO 4762 and DIN 912 standards
- Enhanced material integrity with Rockwell C37 hardness, preventing deformation under high stress conditions
- Environmental compliance assurance meeting RoHS 3 and REACH regulations for safe, sustainable manufacturing
Professional Applications & Engineering Value
These Class 12.9 socket head cap screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc-flake-coated alloy steel construction provides exceptional protection against environmental degradation while maintaining Rockwell C37 hardness for structural integrity. The M4 coarse thread with 0.7mm pitch ensures rapid installation and reliable performance in vibration-prone applications such as heavy machinery, automotive assemblies, and industrial equipment. The 3mm hex drive socket enables precise torque application in confined spaces, making these metric fasteners ideal for precision engineering applications requiring both strength and accessibility.
Specification Summary & Compliance
Manufactured to exacting ISO 4762 and DIN 912 specifications with Class 5g6g thread fit tolerance. Features fully threaded M4 x 0.7mm configuration with 20mm length and standard socket head profile. Compliant with ASTM B117 salt spray testing requirements, RoHS 3 (2015/863/EU) for hazardous substance restriction, and REACH (EC 1907/2006) regulations for chemical safety. Right-hand thread direction with coarse thread spacing ensures compatibility with standard industrial applications.
