S-8077A388 10-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high stress.
• Precise alignment and smooth rotation ensured by the Class 3A thread fit and standard shoulder fit, reducing wear and assembly time.
• Enhanced durability and wear resistance from the black oxide finish and Rockwell B79 hardness, protecting against abrasion and galling.
• Secure, non-slip fastening with a knurled socket head and 1/8" hex drive, providing a firm grip during installation and removal.
• Accurate and consistent fit due to fine 10-32 UNF threads and tight shoulder diameter/length tolerances, ensuring repeatable assembly quality.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and regulatory acceptance for global use.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assemblies, such as in machinery, automotive, and aerospace sectors. The black oxide finish enhances corrosion resistance, while the 10-32 UNF fine thread and Class 3A fit provide secure, vibration-resistant connections, minimizing loosening in dynamic applications. The knurled socket head with a hex drive allows for easy installation in tight spaces, reducing tool slippage and damage. With a high tensile strength of 70,000 psi and robust shoulder design, it supports axial loads and ensures precise component alignment, making it ideal for pivots, guides, and rotating mechanisms where reliability and longevity are paramount.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit and tight tolerances for shoulder diameter (-0.004" to -0.002") and length (-0.005" to 0.005"), ensuring high accuracy. It conforms to ASME B18.3 specifications for consistency and performance. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial applications without hazardous substances.