S-91251A312 7/8"-14 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 ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
- Black-oxide finish on alloy steel offers enhanced corrosion resistance, extending service life in demanding industrial conditions.
- 3/4" hex drive design allows for high torque application and easy installation with standard tools, improving assembly efficiency.
- Fine thread spacing (UNRF) delivers better clamping force distribution and improved holding power compared to coarse threads.
- Rockwell C37 hardness ensures excellent wear resistance and durability under repeated loading cycles.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global industrial use.
Professional Applications & Engineering Value
This socket head cap screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors where high tensile strength and vibration resistance are paramount. The black-oxide alloy steel construction combats corrosion in harsh environments, while the fine UNRF threads and Class 3A fit ensure precise, secure fastening that withstands dynamic loads. Its 3/4" hex drive facilitates efficient installation in confined spaces, reducing assembly time and maintenance costs. Ideal for applications requiring partially threaded designs, this screw provides reliable clamping force in bolted joints, enhancing overall structural integrity and operational safety.
Specification Summary & Compliance
This screw features a 7/8"-14 UNRF thread with Class 3A thread fit for high precision and fine thread spacing. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent material properties and manufacturing quality. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environments requiring strict adherence to health and environmental standards.
