S-91205A601 5/16"-24 x 1 1/4" 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 maintains secure fastening in dynamic environments from -70° to 250°F
- Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress industrial applications
- Precision Class 3A fine threads provide superior fit and consistent clamping force in UNF assemblies
- Corrosion-resistant black-oxide finish on alloy steel extends service life in demanding operating conditions
- Rockwell C37 hardness rating delivers optimal balance of strength and durability for repeated use
- Standard hex drive design allows for easy installation and removal with common tools
- Full thread coverage along the 1 1/4" length ensures maximum engagement and load distribution
Professional Applications & Engineering Value
Engineered for critical fastening applications where vibration resistance and precise thread engagement are paramount, these black-oxide alloy steel socket head cap screws solve common industrial challenges. The combination of Class 3A UNF fine threads and nylon patch thread locking technology prevents loosening in machinery, automotive assemblies, and precision equipment subjected to thermal cycling and dynamic loads. The 170,000 psi tensile strength and controlled hardness (Rockwell C37) ensure these socket head screws maintain structural integrity while the black-oxide surface treatment provides corrosion protection in industrial environments. The standardized hex drive socket head design facilitates installation in confined spaces common in manufacturing and equipment maintenance applications.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances with 5/16"-24 UNF fine threads and full threading along the 1 1/4" length. Complies with ASME B18.3 dimensional specifications and ASTM A574 material standards. Meets environmental compliance requirements including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. Manufactured in inch system measurements with standard socket head profile and right-hand thread direction.
