S-8077A818 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, which also provides a sleek, non-reflective surface.
• High-strength performance with a tensile strength of 70,000 psi and shear strength of 35,000 psi for reliable load-bearing in demanding applications.
• Precise alignment and smooth rotation ensured by the Class 3A thread fit and standard shoulder fit, reducing assembly time and improving machine operation.
• Secure, non-slip installation with the knurled socket head and 5/32" hex drive, allowing for high torque application without tool slippage.
• Versatile 1-3/4" shoulder length provides a stable pivot or spacer, accommodating various component thicknesses in assemblies.
• Full compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common industrial challenges, such as corrosion in humid or chemical-rich settings and the need for high-strength, precision fastening. The black oxide finish not only enhances corrosion resistance but also reduces galling, extending the screw's service life in moving parts like pivots, linkages, and rotating assemblies. With its 1/4"-20 UNC coarse thread and Class 3A fit, it ensures quick, secure installation in machinery, automotive systems, and conveyor equipment, minimizing downtime. The knurled socket head and hex drive allow for easy handling in tight spaces, making it a reliable choice for engineers seeking durability and efficiency in industrial applications.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter of 5/16" with a tolerance of -0.004" to -0.002" and a shoulder length of 1-3/4" with a tolerance of -0.005" to 0.005". The threads adhere to Class 3A fit and UNC standards, ensuring tight tolerances for secure fastening. It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for global industrial use.