S-91251A905 7/8"-9 x 12" 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 applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in demanding industrial environments.
- Class 3A thread fit offers precise, tight-tolerance engagement for secure fastening and vibration resistance.
- 3/4" hex drive with standard socket head allows for high-torque installation using common tools, improving assembly efficiency.
- Partially threaded design with 2 1/4" minimum thread length enables controlled clamping force and simplifies alignment in structural applications.
- Rockwell C37 hardness maintains durability and wear resistance under repeated loads and harsh conditions.
- Coarse UNRC threads facilitate quick assembly and disassembly, saving time in maintenance and repair operations.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy machinery, construction, and manufacturing sectors. The combination of high tensile strength and Class 3A thread precision ensures secure fastening in vibrating environments, minimizing loosening and maintenance downtime. The partially threaded rod type allows for optimal load distribution, making it ideal for bolted joints requiring precise clamp load. With its coarse UNRC thread and 3/4" hex drive, it supports rapid installation in tight spaces, enhancing productivity in assembly lines and field service. The black-oxide surface treatment further protects against rust and wear, extending component life in corrosive industrial settings.
Specification Summary & Compliance
This fastener meets ASTM A574 specifications for high-strength socket head cap screws, ensuring consistent quality and performance. Threads conform to Class 3A fit and UNRC coarse thread standards, providing reliable engagement and interchangeability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for industrial use worldwide.
