S-8077A243 8-32 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh environments and extended service life.
• Precise component alignment and reduced wear thanks to the precision shoulder with controlled diameter and length tolerances.
• High-strength performance under load with a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi for reliable, critical assemblies.
• Superior thread engagement and vibration resistance ensured by the Class 3A thread fit and coarse UNC threading for faster assembly.
• Secure, non-slip installation facilitated by the knurled socket head and hex drive, allowing for high torque application.
• Compliance with stringent environmental regulations, being RoHS 3 and REACH compliant for use in regulated industries.
• Consistent hardness and durability with a Rockwell B79 rating, providing reliable performance and resistance to deformation.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to solve critical challenges in precision assemblies. The Black Oxide finish enhances corrosion resistance, making it suitable for applications exposed to moisture and chemicals. The precision shoulder acts as a pivot, bearing surface, or spacer, ensuring accurate alignment of components like gears, linkages, and rotating parts in machinery, which minimizes wear and prevents axial movement. The UNC coarse thread and Class 3A fit provide excellent vibration resistance and faster installation in materials where fine threads might strip. With a knurled socket head and hex drive, it allows for secure tightening in confined spaces, common in automotive, aerospace, and industrial equipment. This combination of material strength, precise tolerances, and compliant finishes delivers long-term reliability, reducing maintenance needs and downtime in demanding environments.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision. Key dimensional tolerances include a shoulder diameter tolerance of -0.004" to -0.002" and a shoulder length tolerance of -0.005" to 0.005". It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use.