S-8077A813 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel material, ideal for harsh industrial environments and extended service life.
• Enhanced durability and wear resistance from the black oxide finish, providing added protection against rust and reducing galling.
• High-strength performance offering 70,000 psi tensile and 35,000 psi shear strength for reliable use in demanding heavy-duty applications.
• Precise alignment and smooth rotation enabled by the 2 1/2" shoulder with standard fit, reducing component wear and simplifying assembly.
• Secure, high-precision fastening with Class 3A UNC threads, ensuring tight tolerances and superior thread engagement for vibration resistance.
• Easy installation and removal using the hex socket drive and knurled head, allowing for efficient tool grip and reduced slippage in confined spaces.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality, safety, and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial machinery, automation, and precision equipment. The black oxide finish not only enhances corrosion resistance but also minimizes friction, making it ideal for applications involving pivots, rotating shafts, and linkages where smooth motion is essential. The 1/4"-20 UNC coarse thread and Class 3A fit provide reliable fastening in high-vibration environments, reducing the risk of loosening. With a robust 70,000 psi tensile strength and a precisely machined shoulder, this screw ensures accurate component alignment, prolonging the lifespan of assemblies in sectors like automotive, aerospace, and manufacturing. Its hex socket drive and knurled head facilitate quick maintenance, saving time in B2B operations where downtime is costly.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for high precision, a shoulder diameter tolerance of -0.004" to -0.002", and a shoulder length tolerance of -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) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.