S-91205A623 3/8"-16 x 7/8" 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
- Superior vibration resistance with integrated nylon patch thread locker, maintaining secure fastening from -70° to 250°F in demanding environments
- Exceptional mechanical strength with 170,000 psi tensile strength and Rockwell C37 hardness for heavy-duty applications
- Precision Class 3A thread fit ensuring reliable engagement and reduced risk of cross-threading in assembly operations
- Corrosion-resistant black-oxide finish on alloy steel for enhanced durability in industrial settings
- Standard hex socket drive (5/16") enabling high-torque installation without cam-out in confined spaces
- Full thread coverage along the 7/8" length for maximum grip and load distribution
- Industry-standard compliance meeting ASME B18.3 and ASTM A574 specifications for guaranteed interoperability
Professional Applications & Engineering Value
Engineered for critical industrial fastening applications where vibration loosening poses operational risks, these socket head cap screws deliver exceptional performance through their black-oxide alloy steel construction and integrated nylon patch thread locker. The Class 3A UNC coarse threads provide superior engagement in softer materials and faster assembly, while the 170,000 psi tensile strength ensures structural integrity under extreme loads. Ideal for machinery, automotive subsystems, and precision equipment requiring vibration-resistant fasteners that maintain clamp force through thermal cycling and dynamic stresses. The combination of hex drive accessibility and fully threaded design enables versatile installation in both blind and through-hole applications.
Specification Summary & Compliance
Manufactured to ASME B18.3 dimensional standards with ASTM A574 material certification, these screws feature precision UNC 3/8"-16 Class 3A threads with coarse spacing for optimal performance. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures suitability for global industrial supply chains. The black-oxide surface treatment provides consistent corrosion protection while maintaining dimensional accuracy across the 9/16" head diameter and 3/8" head height profile.
