S-91259A740 3/8"-16 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Superior load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications
• Precision alignment and smooth rotation thanks to the 6-1/2" shoulder with tight diameter tolerance for consistent component positioning
• Exceptional corrosion resistance through black oxide finish that protects against rust in industrial environments
• High-strength alloy steel construction with Rockwell C32 hardness ensures long-term durability and wear resistance
• Secure installation and removal with hex socket drive design providing positive torque transmission without stripping
• Precision thread engagement with Class 3A UNC coarse threads ensuring reliable fastening in high-vibration applications
• Knurled head texture for improved grip during manual handling and installation procedures

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers exceptional engineering value in precision machinery and industrial equipment where alignment and rotational movement are critical. The 6-1/2" shoulder length with controlled diameter tolerance provides precise bearing surfaces for gears, pulleys, and rotating assemblies, eliminating the need for additional bushings or spacers. The black oxide finish offers corrosion protection while maintaining dimensional stability in harsh operating conditions. With Class 3A UNC coarse threads and 140,000 psi tensile strength, this socket head shoulder screw maintains secure fastening in high-vibration environments common in manufacturing equipment, automotive assemblies, and heavy machinery. The combination of high-strength alloy steel and precision manufacturing ensures reliable performance in applications requiring repeated assembly and disassembly.

Specification Summary & Compliance

This precision shoulder screw features 3/8"-16 UNC Class 3A threads with coarse thread spacing for optimal engagement. The shoulder maintains tight dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, this component ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict material compliance standards.