S-91264A245 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Secure Vibration Resistance: Integrated nylon pellet thread locker prevents loosening under dynamic loads, maintaining clamp force in temperatures from -50° to 250°F.
• Exceptional Strength & Durability: Alloy steel construction with Rockwell C32 hardness delivers 140,000 psi tensile and 84,000 psi shear strength for heavy-duty applications.
• Precision Alignment & Bearing Surface: The 3/4" shoulder with tight diameter tolerance provides a stable pivot or spacer, reducing wear on mating components.
• Corrosion-Resistant Protection: Black oxide finish offers enhanced rust resistance, extending service life in harsh industrial environments.
• Reliable Thread Engagement: Class 3A thread fit with 10-24 UNC coarse thread ensures consistent, secure fastening and easier assembly.
• Easy Installation in Confined Spaces: Socket head with hex drive allows for high-torque application using standard tools, even in limited access areas.
• Full Regulatory Compliance: Meets ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This high-performance shoulder screw is engineered to solve critical alignment and retention challenges in industrial machinery, automation systems, and precision equipment. The alloy steel core and black oxide finish provide superior resistance to wear and corrosion, ideal for environments exposed to oils, moisture, or temperature fluctuations. The 10-24 UNC coarse thread and Class 3A fit guarantee reliable fastening with minimal risk of cross-threading, while the nylon pellet locking mechanism secures assemblies against vibration-induced failure. The precisely machined shoulder acts as a durable bearing surface or pivot, reducing component wear and simplifying assembly in robotic arms, conveyor systems, and fixture plates. By integrating high tensile and shear strength with locking features, this screw minimizes maintenance downtime and enhances operational reliability.

Specification Summary & Compliance

This shoulder screw features a 10-24 UNC thread with Class 3A fit, 3/8" thread length, and a shoulder diameter of 1/4" with tolerance of -0.004" to -0.002". The shoulder length is 3/4" with a tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to international safety and environmental standards.