S-91205A533 1/4"-20 x 5/16" 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 vibration resistance with integrated nylon patch thread locker that maintains secure fastening from -70° to 250°F
- Superior strength for demanding applications thanks to 170,000 psi tensile strength and Rockwell C37 hardness
- Precise thread engagement with Class 3A thread fit ensuring reliable performance in critical assemblies
- Enhanced corrosion protection through black-oxide coating on alloy steel for extended service life
- Industry-standard compatibility with UNC coarse threads and hex drive design for easy installation
- Full regulatory compliance meeting ASME B18.3, ASTM A574, RoHS 3, and REACH requirements
- Optimal torque transmission through standard socket head profile and 3/16" hex drive
Professional Applications & Engineering Value
Engineered for high-stress industrial environments, these black-oxide alloy steel socket head cap screws deliver exceptional performance where vibration resistance and reliability are critical. The nylon patch thread locker prevents loosening under dynamic loads, making them ideal for machinery, automotive assemblies, and manufacturing equipment. The Class 3A thread fit ensures precise engagement in tapped holes, while the UNC coarse threads provide rapid installation in production settings. With 170,000 psi tensile strength and corrosion-resistant black-oxide coating, these fasteners maintain integrity in demanding applications from heavy equipment to precision instruments, reducing maintenance needs and downtime.
Specification Summary & Compliance
This 1/4"-20 x 5/16" socket head cap screw features Class 3A thread fit with UNC coarse threads and right-hand thread direction. Manufactured to ASME B18.3 standards using ASTM A574 alloy steel material specification. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. The fastener includes nylon patch thread locker and meets dimensional requirements for socket head cap screws in inch system measurements.
