S-8077A662 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Enhanced durability and wear resistance from the black oxide finish, providing added protection against abrasion and oxidation.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable load-bearing in demanding applications.
• Precise alignment and smooth rotation due to the knurled head and standard shoulder fit, reducing assembly time and improving component stability.
• Secure, high-tolerance fastening with Class 3A thread fit and UNC coarse threading, offering excellent vibration resistance and easy installation.
• Easy installation and removal using a standard 3/16" hex drive, compatible with common tools for efficient maintenance.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw with a black oxide finish is engineered to address critical challenges in industrial settings, such as corrosion, high stress, and precise component alignment. The UNC coarse thread and Class 3A thread fit provide robust, vibration-resistant connections, minimizing loosening in machinery and equipment. Its knurled head enhances grip during manual adjustments, while the precise shoulder diameter and length ensure accurate positioning in assemblies like bearings, pulleys, and linkages. Ideal for applications in manufacturing, automotive, and marine industries, this screw delivers reliable performance under heavy loads and corrosive conditions, reducing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for high precision, a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002"), and shoulder length of 13/16" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory adherence.