S-91264A120 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Secure Vibration Resistance: Integrated nylon pellet thread locker ensures reliable fastening in high-vibration environments, maintaining integrity from -50° to 250°F.
• Exceptional Load-Bearing Capacity: Made from high-strength alloy steel with 140,000 psi tensile strength and 84,000 psi shear strength for heavy-duty applications.
• Precision Fit and Alignment: Class 3A thread fit and standard shoulder fit provide accurate assembly and reduced wear in machinery.
• Enhanced Durability and Corrosion Resistance: Black oxide finish offers added protection against rust and abrasion in harsh industrial settings.
• Easy Installation and Removal: Hex socket drive with 1/8" size and knurled head allows for quick, slip-resistant tool engagement.
• Broad Temperature Compatibility: Suitable for operations across extreme temperatures, thanks to the nylon locking pellet's stable performance range.
• Standardized Reliability: Complies with ASME B18.3 specifications, ensuring consistent quality and interchangeability in professional use.

Professional Applications & Engineering Value

This 10-24 UNC alloy steel shoulder screw is engineered to address common industrial challenges such as misalignment, vibration-induced loosening, and high-stress fatigue. The coarse threading and precise Class 3A thread fit facilitate quick assembly in machinery, while the 1/4" shoulder diameter provides stable bearing surfaces for rotating parts like gears and pulleys. The nylon pellet thread locking feature eliminates the need for additional fasteners, reducing maintenance in automotive, aerospace, and manufacturing equipment. With a black oxide finish enhancing corrosion resistance, this screw ensures long-term performance in demanding environments, from assembly lines to heavy machinery, where reliability and compliance with ASME B18.3 standards are critical.

Specification Summary & Compliance

This shoulder screw features a 10-24 UNC coarse thread with Class 3A fit for high precision, and a shoulder diameter tolerance of -0.004" to -0.002" for consistent alignment. Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, it ensures reliable performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible industrial applications.