S-91205A582 5/16"-18 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 in dynamic environments 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 consistent engagement and reduces the risk of cross-threading during assembly
- Enhanced corrosion protection from black-oxide coating on alloy steel, extending service life in demanding conditions
- Optimized drive engagement with standard hex socket head design for secure tool mating and reduced cam-out risk
- Industry-standard compliance with ASME B18.3 specifications ensures dimensional accuracy and interchangeability
- Environmental regulation adherence meeting RoHS 3 and REACH requirements for global manufacturing compatibility
Professional Applications & Engineering Value
These socket head cap screws deliver critical engineering solutions where vibration resistance and precise fastening are paramount. The black-oxide alloy steel construction combined with nylon patch thread locker addresses common industrial challenges of fastener loosening under continuous vibration and thermal cycling. The UNC coarse thread profile with Class 3A fit ensures rapid assembly while maintaining tight tolerances in machinery, automotive, and heavy equipment applications. The 170,000 psi tensile strength and Rockwell C37 hardness provide reliable performance in high-load scenarios, making these fasteners ideal for critical joints in production equipment, structural frameworks, and precision assemblies where failure is not an option.
Specification Summary & Compliance
This 5/16"-18 x 7/8" socket head cap screw features precision Class 3A thread fit with UNC coarse thread specifications. Manufacturing conforms to ASME B18.3 dimensional standards with fully threaded design. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring global regulatory acceptance for industrial applications.
