S-8077A823 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 chemical exposure.
• Enhanced durability and wear resistance from the black oxide finish, providing long-lasting performance and reduced maintenance.
• Precise alignment and secure fit thanks to the Class 3A thread fit and standard shoulder, minimizing assembly errors and vibration loosening.
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliability in heavy-duty applications.
• Easy installation and removal with the hex socket drive and knurled head, allowing for efficient tool engagement and handling.
• Consistent dimensional accuracy per ASME B18.3 standards, guaranteeing interchangeability and fit in precision assemblies.
• Environmental and regulatory compliance with RoHS 3 and REACH, making it safe for various industries and global supply chains.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial settings, such as corrosion from moisture and chemicals, and mechanical stress in high-load assemblies. The black oxide finish not only enhances corrosion resistance but also reduces friction during installation, extending the fastener's lifespan. With a Class 3A thread fit and precise shoulder diameter of 5/16", it ensures exact alignment in machinery, pivots, and rotating components, preventing misalignment and reducing wear. Ideal for applications like precision equipment, automotive systems, and marine hardware, this screw offers reliable performance where durability and dimensional stability are paramount, supported by its high tensile and shear strength.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, ensuring consistent quality and dimensional accuracy, including a Class 3A thread fit for tight tolerances. Key dimensions include a thread size of 1/4"-20 UNC with coarse spacing, shoulder diameter of 5/16" (tolerance: -0.004" to -0.002"), and shoulder length of 3 3/4" (tolerance: -0.005" to 0.005"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and global industrial use.