S-91251A388 1 1/8"-7 x 3 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 for reliable performance in high-stress applications
- Superior corrosion resistance with black-oxide coating, extending service life in demanding environments
- High torque capability with 7/8" hex drive, ensuring secure installation and removal
- Precision Class 2A thread fit for smooth assembly and consistent engagement
- Robust Rockwell C37 hardness providing excellent wear resistance and durability
- Coarse UNRC thread design offering faster installation and reduced cross-threading risks
- Comprehensive compliance with ASTM A574, RoHS 3, and REACH standards for quality assurance
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver critical performance advantages for industrial applications where reliability is paramount. The coarse UNRC thread configuration ensures rapid assembly in heavy machinery, construction equipment, and manufacturing systems, while the partially threaded design provides optimal clamping force distribution. Engineered with 170,000 psi tensile strength and Rockwell C37 hardness, these fasteners withstand extreme vibrational loads and shock impacts common in automotive, aerospace, and industrial machinery applications. The black-oxide surface treatment offers superior corrosion protection in challenging environments, making them ideal for outdoor equipment and harsh manufacturing conditions where fastener failure is not an option.
Specification Summary & Compliance
This socket head cap screw features precision Class 2A thread fit with 1 1/8"-7 coarse UNRC right-hand threads and 3 1/2" length. Manufactured to ASTM A574 specifications for high-strength alloy steel socket head cap screws, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for safe and sustainable industrial components.
