S-91259A854 5/8"-11 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 industrial environments
• Superior corrosion resistance from black oxide finish, extending service life and reducing maintenance requirements
• Precision alignment capability with 3/4" shoulder diameter and tight tolerances ensuring accurate component positioning
• High load-bearing capacity featuring 140,000 psi tensile strength and 84,000 psi shear strength for heavy-duty applications
• Secure fastening performance with Class 3A thread fit and UNC coarse threads providing reliable engagement and vibration resistance
• Easy installation and removal through 3/8" hex drive socket head design, accessible with standard industrial tools
• Knurled head texture for improved grip during manual handling and installation procedures

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment. The 3/4" shoulder diameter with tight tolerances (-0.004" to -0.002") provides exact alignment in rotating assemblies, jigs, and fixtures, eliminating costly misalignment issues. The black oxide finish offers substantial corrosion protection in manufacturing environments where exposure to oils and moisture is common. With 5/8"-11 UNC coarse threads and Class 3A fit, this socket head shoulder screw maintains secure fastening under high vibration conditions common in automation equipment, presses, and material handling systems. The combination of 4 3/4" shoulder length and 140,000 psi tensile strength makes it ideal for applications requiring both precise component spacing and structural integrity.

Specification Summary & Compliance

This precision shoulder screw features inch system measurements with Class 3A thread fit and UNC coarse threading standards. Manufacturing specifications comply with ASME B18.3 standards where identified as ASTM A574. The product maintains environmental compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. Critical dimensions include shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005", ensuring consistent performance in precision assembly applications.