S-8077A366 8-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh environments and extended service life
• Exceptional mechanical strength providing 70,000 psi tensile and 35,000 psi shear strength for reliable performance in heavy-duty applications
• Precise Class 3A thread fit ensuring accurate alignment and secure fastening in demanding assemblies
• Enhanced grip and torque application from the knurled socket head design, reducing tool slippage during installation
• Accurate shoulder positioning with controlled diameter and length tolerances for consistent component location
• Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
• Optimized for high-torque applications featuring coarse UNC threads and hex drive for efficient assembly and disassembly

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw with Black Oxide finish delivers critical engineering advantages in precision machinery, automation systems, and industrial equipment. The combination of Class 3A thread fit and precisely controlled shoulder dimensions solves alignment challenges in rotating assemblies, pivot points, and locating applications where positional accuracy is paramount. The coarse 8-32 UNC thread provides excellent engagement in softer materials while resisting vibration-induced loosening. With 70,000 psi tensile strength and exceptional corrosion resistance, this fastener maintains structural integrity in demanding environments including marine, chemical processing, and outdoor applications where moisture and corrosive agents are present. The knurled socket head ensures positive tool engagement during high-torque installation, preventing costly damage to drive interfaces.

Specification Summary & Compliance

This shoulder screw features precision Class 3A thread fit with 8-32 UNC coarse threads, manufactured to ASME B18.3 specifications. Critical dimensions include 1/4" shoulder diameter (-0.004" to -0.002" tolerance) and 3/8" shoulder length (-0.005" to 0.005" tolerance) for consistent positioning performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. Material certification confirms 316 Stainless Steel composition with Rockwell B79 hardness for optimal durability.