S-8077A633 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 environments and chemical exposure.
• Enhanced durability and wear resistance from the black oxide finish, providing a protective layer against abrasion.
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under heavy loads.
• Precise thread engagement with Class 3A fit and 1/4"-20 UNC coarse threads, offering secure fastening and vibration resistance.
• Easy installation and removal thanks to the hex socket drive and knurled head, allowing for better grip and torque application.
• Accurate shoulder positioning with controlled diameter and length tolerances, facilitating precise alignment in assemblies.
• Compliance with industry standards including ASME B18.3, RoHS, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial and mechanical systems. The black oxide finish enhances corrosion resistance, making it suitable for applications in marine, chemical processing, and outdoor equipment where moisture and chemicals are prevalent. The 1/4"-20 UNC coarse thread and Class 3A thread fit provide reliable fastening in high-vibration environments, reducing the risk of loosening in machinery, automotive components, and precision instruments. With a knurled head and hex drive, it ensures easy handling and secure torque transmission, while the precise shoulder dimensions support accurate bearing and pivot points in assemblies, minimizing misalignment and wear over time.

Specification Summary & Compliance

This shoulder screw adheres to tight dimensional tolerances, including a Class 3A thread fit for superior accuracy and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 specifications, ensuring consistent manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety standards for hazardous substance restrictions.