S-91251A320 1"-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
- Superior tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Exceptional hardness at Rockwell C37 provides excellent wear resistance and durability for extended service life.
- Black-oxide finish on alloy steel offers enhanced corrosion resistance, ideal for harsh industrial environments.
- Class 3A thread fit delivers precise, tight-tolerance engagement for secure, vibration-resistant assemblies.
- Partially threaded design with fine UNRF threads allows for optimal clamping force and reduced loosening under dynamic loads.
- 3/4" hex drive and standard socket head facilitate easy installation and removal with common tools, improving assembly efficiency.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global industrial use.
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"-14 UNRF fine thread and Class 3A fit provide superior grip and fatigue resistance, minimizing thread stripping in high-vibration settings. With a minimum thread length of 2 1/2" and partially threaded rod, it ensures even load distribution and secure fastening in structural assemblies. Ideal for industrial fasteners requiring precise torque and long-term reliability, this screw reduces maintenance needs and enhances operational safety in demanding applications.
Specification Summary & Compliance
This socket head cap screw features a 1"-14 UNRF fine thread with Class 3A tolerance for accurate fit, a length of 3 1/2", and a head diameter of 1 1/2". Manufactured to ASTM A574 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and material integrity for industrial use.
