S-8077A298 3/8"-16 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 component alignment and rotation ensured by the 1 1/4" shoulder with tight diameter and length tolerances
• High-strength fastening for demanding applications with 70,000 psi tensile strength and 35,000 psi shear strength
• Secure, slip-resistant installation thanks to the knurled head and 1/4" hex socket drive for reliable torque application
• Consistent, reliable thread engagement with Class 3A UNC coarse threads, reducing the risk of cross-threading and assembly errors
• Compliance with global standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw in 316 stainless steel with a black oxide finish is engineered to address critical challenges in precision machinery and industrial assemblies. The 1 1/4" shoulder length with minimal tolerances provides a stable bearing surface for rotating parts, minimizing misalignment and wear in applications like pivots, guides, and spindles. The Class 3A thread fit and coarse UNC thread design ensure quick, secure fastening even in high-vibration environments, reducing assembly time and improving reliability. With high tensile and shear strength, it supports heavy-duty operations in automotive, aerospace, and manufacturing equipment, while the knurled head and hex drive allow for easy handling and torque control. Its corrosion-resistant properties make it suitable for outdoor, marine, or chemical processing settings, delivering long-term performance and reducing downtime.

Specification Summary & Compliance

This shoulder screw features a 3/8"-16 UNC thread with Class 3A fit for precise thread engagement, a shoulder diameter of 1/2" with tolerance of -0.004" to -0.002", and shoulder length of 1 1/4" with 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 safe for industrial use.