S-91264A800 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Performance: With a tensile strength of 140,000 psi and shear strength of 84,000 psi, this shoulder screw provides reliable fastening in high-stress industrial environments.
• Secure Vibration Resistance: Integrated nylon pellet thread locker maintains clamping force from -50° to 250°F, preventing loosening under dynamic loads and thermal cycling.
• Precision Shoulder Alignment: The 3/4" shoulder diameter with tight tolerance control ensures accurate component positioning and smooth rotational movement.
• Enhanced Durability & Corrosion Protection: Black oxide finish on alloy steel substrate offers improved wear resistance and moderate corrosion protection for extended service life.
• Superior Thread Engagement: Class 3A thread fit with 5/8"-11 UNC coarse threads provides secure mating and easier assembly in demanding applications.
• Optimized Installation Efficiency: Knurled socket head with 3/8" hex drive allows for secure tool engagement and efficient torque application during installation.
• Regulatory Compliance Assurance: Meets ASME B18.3 manufacturing standards and complies with RoHS 3 and REACH regulations for global industrial use.

Professional Applications & Engineering Value

This high-strength shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment where alignment accuracy and vibration resistance are paramount. The alloy steel construction with Rockwell C32 hardness ensures dimensional stability under heavy loads, while the black oxide finish provides essential corrosion protection in demanding environments. The precision-ground 3/4" shoulder diameter acts as both a pivot point and locating feature, eliminating the need for additional bushings in applications such as rotating assemblies, linkages, and precision guides. The integrated nylon pellet thread locker addresses common vibration-induced loosening issues in automotive, aerospace, and heavy machinery applications, maintaining clamp load integrity across a wide temperature range from -50° to 250°F. This combination of precision manufacturing, material strength, and locking technology makes it ideal for industrial shoulder screw applications requiring both structural integrity and operational reliability.

Specification Summary & Compliance

This shoulder screw features precision dimensional control with Class 3A thread fit for superior engagement and shoulder diameter tolerance of -0.004" to -0.002" ensuring exact component alignment. Manufactured to ASME B18.3 specifications with 5/8"-11 UNC coarse threads and right-hand thread direction, it delivers consistent performance in industrial fastening applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting global environmental standards while maintaining the mechanical properties specified under ASTM A574 material requirements for reliable industrial use.