S-91205A603 5/16"-24 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
- Vibration-resistant locking with nylon patch thread locker prevents loosening under dynamic loads and thermal cycling from -70° to 250°F
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications
- Precision Class 3A thread fit provides superior engagement and consistent clamping force in critical assemblies
- Corrosion-resistant black-oxide finish on alloy steel base material enhances durability in demanding environments
- Standard hex socket drive allows for high-torque installation and removal with common industrial tools
- Fine UNF thread profile offers improved load distribution and resistance to vibrational loosening
- Full threading along 1-1/2" length enables flexible positioning and secure fastening throughout the engagement area
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw delivers critical performance where vibration resistance and mechanical reliability are paramount. The nylon patch thread locker creates consistent locking force without compromising the Class 3A UNF fine threads, making it ideal for machinery, automotive assemblies, and precision equipment subjected to thermal expansion and dynamic stresses. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures dimensional stability under heavy loads, while the black-oxide surface treatment provides corrosion protection without significant dimensional change. Engineering teams specify these socket head cap screws for applications requiring repeated disassembly and reassembly while maintaining locking integrity.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with material compliance to ASTM A574, this fastener features Class 3A thread fit for precision applications. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental responsibility. Thread specifications include 5/16"-24 UNF fine thread with right-hand direction and fully threaded design. Temperature capability ranges from -70° to 250°F due to the nylon patch locking element, maintaining performance across industrial operating conditions.
