S-8077A661 1/4"-20 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 industrial environments.
• Precise alignment and reduced wear due to the standard shoulder fit and Class 3A thread fit, ensuring reliable performance in assemblies.
• High strength for demanding applications, offering 70,000 psi tensile strength and 35,000 psi minimum shear strength to handle heavy loads.
• Easy installation and removal with a hex drive and knurled head, providing a secure grip and reducing tool slippage.
• Durable and long-lasting with Rockwell B79 hardness, maintaining integrity under repeated use and stress.
• Wide compatibility through UNC coarse threading and adherence to ASME B18.3 standards, ensuring interchangeability in various systems.
• Environmental and regulatory compliance, meeting RoHS 3 and REACH standards for safe, sustainable use in global markets.

Professional Applications & Engineering Value

This shoulder screw is engineered to address common industrial challenges, such as misalignment and corrosion in machinery. Made from 316 stainless steel with a black oxide finish, it provides exceptional resistance to moisture and chemicals, extending service life in applications like automotive assemblies, conveyor systems, and precision equipment. The UNC coarse thread and Class 3A fit ensure quick, secure fastening with minimal risk of cross-threading, while the shoulder design supports rotational components, reducing friction and wear. Ideal for heavy-duty industrial use, it combines durability with ease of maintenance, making it a reliable choice for engineers seeking high-performance socket head shoulder screws that meet rigorous standards.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a 1/4"-20 UNC thread with Class 3A fit for tight tolerances, a shoulder diameter of 3/8" with tolerance from -0.004" to -0.002", and a thread length of 3/4". It complies with ASME B18.3 manufacturing specifications and is certified to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial applications.