S-91259A709 3/8"-16 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional durability with alloy steel construction and Rockwell C32 hardness for long-lasting performance in demanding environments
• Superior corrosion resistance from black oxide finish, extending service life in harsh industrial conditions
• Precise shoulder alignment with 1/2" diameter and tight tolerances (±0.005") ensuring accurate component positioning
• High load capacity with 140,000 psi tensile strength and 84,000 psi shear strength for heavy-duty applications
• Secure installation through Class 3A thread fit and knurled hex socket head preventing slippage during torque application
• Industry compliance meeting ASME B18.3 standards and RoHS 3/REACH regulations for quality assurance
• Quick assembly with coarse UNC threads and right-hand direction enabling faster installation in production environments

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions where precision alignment and high-strength performance are paramount. The black oxide finish provides essential corrosion protection for machinery operating in challenging environments, while the 5/8" shoulder length with tight diameter tolerances ensures exact component spacing in assemblies. The 3/8"-16 UNC coarse thread combined with Class 3A thread fit offers superior engagement in metal components, preventing loosening under vibration. Ideal for precision applications including rotating machinery, automation equipment, and industrial fixtures, this socket head shoulder screw maintains dimensional stability under heavy loads, reducing maintenance requirements and downtime in manufacturing operations.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit for superior engagement and UNC coarse thread specifications. The shoulder features precise dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Fully compliant with ASME B18.3 specifications, manufactured per ASTM A574 standards, and meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for global industrial applications.