S-91251A484 5/8"-18 x 2 1/4" ASTM A574 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 tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications
- Superior corrosion resistance from black-oxide coating extends service life in demanding environments
- Precision Class 3A thread fit provides consistent, vibration-resistant fastening with minimal play
- Optimized torque transmission through 1/2" hex drive prevents tool slippage and damage during installation
- Fine UNRF thread profile delivers enhanced clamping force and superior resistance to loosening
- Full-threaded design allows for maximum engagement depth and flexibility in assembly applications
- Industry compliance assurance with ASTM A574, RoHS 3, and REACH standards guarantees material quality and environmental safety
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw addresses critical engineering challenges in heavy machinery, automotive, and industrial equipment assembly. The combination of Rockwell C37 hardness and 170,000 psi tensile strength provides exceptional resistance to shear forces and fatigue failure, while the fine UNRF threads maintain clamping force under vibration. The black-oxide surface treatment creates a protective barrier against corrosion without compromising dimensional accuracy, making these socket head cap screws ideal for precision applications where both strength and environmental resistance are paramount. The fully threaded design ensures maximum engagement in blind holes and through-holes alike.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit for precision assembly, 5/8"-18 UNRF fine threads, and 2-1/4" length. Complies with ASTM A574 specification for alloy steel socket head cap screws, ensuring material integrity and performance consistency. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for safe use in regulated industries.
