S-91264A252 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: With a tensile strength of 140,000 psi and minimum shear strength of 84,000 psi, this shoulder screw reliably handles high-stress applications without failure.
• Secure Vibration Resistance: Integrated nylon pellet thread locker maintains fastener integrity in temperatures from -50° to 250°F, preventing loosening in dynamic environments.
• Precision Alignment & Durability: The 1/4" shoulder diameter with tight tolerances ensures accurate component positioning, while the Rockwell C32 hardness offers excellent wear resistance.
• Corrosion Protection & Longevity: Black oxide finish on alloy steel provides enhanced corrosion resistance, extending service life in harsh industrial conditions.
• Easy Installation & Grip: Hex socket drive with knurled head allows for secure tool engagement and manual adjustment, reducing assembly time and slippage.
• Standardized Reliability: Class 3A thread fit and UNC coarse threading ensure consistent, high-precision fastening that meets rigorous industry specifications.
• Broad Compliance for Global Use: Meets ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental compliance across international markets.

Professional Applications & Engineering Value

This 10-24 UNC shoulder screw is engineered to address critical challenges in precision assembly and heavy-duty machinery. The alloy steel construction with black oxide finish combats corrosion and wear, making it ideal for automotive, aerospace, and industrial equipment where exposure to oils, moisture, and temperature fluctuations is common. The 1/4" shoulder diameter provides a precise pivot or bearing surface, eliminating misalignment in rotating components like gears and pulleys. Combined with the nylon pellet thread locker, it secures connections against vibrations in motors and conveyors, reducing maintenance downtime. The hex drive and knurled head facilitate quick installation in tight spaces, enhancing efficiency in high-volume production lines. By integrating Class 3A thread fit and coarse UNC threads, this screw ensures rapid, reliable fastening that meets the demands of ASME B18.3 compliant applications, delivering long-term performance and cost savings.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and UNC coarse threading (10-24 size) with a thread diameter of 0.19". The shoulder diameter is 1/4" with a tolerance of -0.004" to -0.002", and shoulder length is 1/4" with a tolerance of -0.005" to 0.005", ensuring consistent performance. Manufactured in compliance with ASME B18.3 and material specifications per ASTM A574, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for global industrial use.