S-91259A904 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications
• Precision Class 3A thread fit ensures tight tolerances and secure fastening in high-vibration environments
• Corrosion-resistant black oxide finish provides durable protection against rust and extends service life
• Knurled socket head with 3/8" hex drive offers superior grip and prevents tool slippage during installation
• High-strength alloy steel construction maintains structural integrity under extreme mechanical stress
• Rockwell C32 hardness rating guarantees consistent performance and resistance to wear
• Coarse UNC threading enables quick assembly and disassembly while maintaining holding power

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions for industrial machinery, automation systems, and precision equipment. The Class 3A thread fit eliminates play in rotating assemblies, while the black oxide finish withstands harsh operating conditions without compromising dimensional stability. The knurled socket head provides positive engagement with standard hex tools, reducing installation time and preventing damage to drive surfaces. With its 140,000 psi tensile strength, this component serves as a reliable pivot point in conveyor systems, robotic arms, and manufacturing jigs where shoulder screws must maintain alignment under continuous load cycles.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and ASTM A574 material standards. Shoulder diameter tolerance maintained at -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.