S-91251A319 7/8"-14 x 4 1/2" 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 guarantees secure fastening with minimal vibration loosening
- Optimal hardness rating (Rockwell C37) provides excellent wear resistance and durability
- Fine UNRF thread profile delivers enhanced clamping force and superior load distribution
- 3/4" hex drive compatibility allows for high-torque installation with standard industrial tools
- Partially threaded design enables precise positioning and reduces thread galling risks
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw addresses critical engineering challenges in heavy machinery, automotive manufacturing, and structural assembly applications. The 7/8"-14 UNRF fine thread configuration provides superior resistance to vibrational loosening while maintaining precise clamping force in high-load scenarios. The Class 3A thread fit ensures consistent engagement in precision-machined components, reducing assembly time and improving joint reliability. The black-oxide surface treatment offers enhanced corrosion protection without compromising dimensional accuracy, making it ideal for applications where both strength and environmental resistance are paramount. The partially threaded design allows for optimal stress distribution while preventing thread damage during repeated installations.
Specification Summary & Compliance
This socket head cap screw features precision Class 3A thread tolerances with UNRF fine thread profile and 7/8"-14 thread size. Manufactured to ASTM A574 specification for alloy steel socket head cap screws, ensuring consistent mechanical properties and dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations, meeting the latest industry standards for hazardous substance restrictions and chemical safety.
