S-91251A931 1"-8 x 7 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.
- Corrosion-resistant black-oxide finish on alloy steel enhances durability and longevity in harsh industrial environments.
- Class 3A thread fit provides superior precision and tight tolerances for secure, vibration-resistant assemblies.
- 3/4" hex drive socket head allows for high-torque installation with standard tools, improving assembly efficiency.
- Coarse UNRC threads enable quick engagement and reduced cross-threading in coarse adjustment scenarios.
- Partially threaded design offers optimal clamping force control and alignment in varied material thicknesses.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and global regulatory acceptance.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors, where high tensile strength and corrosion resistance are paramount. The 1"-8 coarse UNRC threads and Class 3A fit minimize assembly time and prevent loosening under dynamic loads, while the 3/4" hex drive accommodates high torque for secure fastening in tight spaces. Ideal for industrial fastening applications requiring reliable performance, it reduces maintenance needs and enhances structural integrity in demanding environments, supported by its Rockwell C37 hardness and robust material properties.
Specification Summary & Compliance
This screw features precise Class 3A thread fit and coarse UNRC threads with a size of 1"-8, ensuring dimensional accuracy per industry standards. It is manufactured in compliance with ASTM A574 for consistent quality and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety requirements without hazardous substances.
