S-91205A587 5/16"-18 x 1 1/2" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws
Alloy Steel Thread-Locking 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.
- Nylon patch thread locker provides secure, vibration-resistant locking from -70° to 250° F, maintaining clamp load in fluctuating temperatures.
- Class 3A thread fit offers tighter tolerances for precise assembly and improved fatigue resistance in demanding environments.
- Black-oxide coating on alloy steel enhances corrosion resistance and provides a durable, non-galling surface for extended service life.
- 1/4" hex drive socket head allows for high-torque installation in confined spaces, streamlining maintenance and assembly processes.
- Fully threaded UNC coarse design enables faster installation and higher resistance to loosening under dynamic loads.
- Compliance with ASME B18.3 and ASTM A574 guarantees consistent quality and interchangeability for OEM and MRO applications.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Black-Oxide Alloy Steel Socket Head Cap Screw addresses critical challenges in machinery, automotive, and aerospace sectors. The coarse UNC thread and Class 3A fit minimize cross-threading risks during high-speed assembly, while the nylon patch thread locker secures joints against vibration-induced loosening—common in rotating equipment. Its 170,000 psi tensile strength and Rockwell C37 hardness provide reliable fastening under extreme mechanical loads, reducing downtime and maintenance costs. The black-oxide finish offers added protection in mildly corrosive environments, making it ideal for high-strength fastening solutions where durability and precision are non-negotiable.
Specification Summary & Compliance
This socket head cap screw features a 5/16"-18 UNC coarse thread with Class 3A thread fit for precise engagement and high fatigue resistance. Manufacturing adheres to ASME B18.3 and ASTM A574 specifications, ensuring dimensional accuracy and material integrity. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting sustainable and safe industrial practices.
