S-91264A721 1/2"-13 ASME B18.3, ASTM A574 Shoulder Screws
Shoulder 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 load-bearing capacity with 140,000 psi tensile and 84,000 psi shear strength for reliable performance in demanding applications.
- Secure vibration-resistant locking thanks to the integrated nylon pellet thread locker, maintaining integrity from -50° to 250°F.
- Precise alignment and reduced wear from the knurled socket head and standard shoulder fit, ensuring stable assembly and extended service life.
- Superior corrosion resistance and durability with black oxide finish on alloy steel, enhancing longevity in harsh industrial environments.
- Accurate and reliable threading with Class 3A UNC coarse threads, providing consistent engagement and reducing cross-threading risks.
- Easy installation and high torque application via the 5/16" hex drive, facilitating efficient maintenance and assembly processes.
- Compliance with industry standards including ASME B18.3 and ASTM A574, ensuring quality and interoperability in professional settings.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical challenges in machinery assembly, automation systems, and precision equipment where alignment and vibration resistance are paramount. The alloy steel construction, combined with a black oxide finish, offers robust protection against wear and corrosion, making it ideal for high-stress environments. The integrated nylon pellet thread locker secures fastenings under thermal fluctuations from -50° to 250°F, preventing loosening in dynamic applications. With a Class 3A thread fit and UNC coarse threading, it ensures quick, reliable installation in components like bearings, linkages, and pivots, reducing downtime and enhancing operational safety. Its knurled socket head and precise shoulder dimensions provide stable positioning, minimizing misalignment and extending the lifespan of assembled parts.
Specification Summary & Compliance
This shoulder screw features precision Class 3A thread tolerances for accurate fit, adhering to UNC standards with a 1/2"-13 thread size. Manufacturing complies with ASME B18.3 and ASTM A574 specifications, ensuring dimensional consistency and high strength. It is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
