S-94383A360 5/16"-18 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Strength and Durability: With a tensile strength of 140,000 psi and minimum shear strength of 84,000 psi, this shoulder screw ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance: The black oxide finish provides enhanced protection against rust and corrosion, extending the screw's service life in harsh industrial environments.
• Precision Fit and Alignment: Featuring a Class 3A thread fit and tight shoulder tolerances, it offers exact alignment and secure fastening, minimizing assembly errors and improving machine reliability.
• Easy Installation and Removal: The knurled socket head with a hex drive allows for quick and secure tool engagement, speeding up maintenance and reducing labor time.
• High-Temperature and Wear Resistance: Made from alloy steel with Rockwell C32 hardness, it maintains integrity under thermal and mechanical stress, ideal for repetitive use in machinery.
• Broad Compliance and Safety: Meets ASME B18.3, RoHS 3, and REACH standards, ensuring environmental safety and adherence to global industrial regulations for worry-free procurement.
• Versatile Coarse Thread Design: The 5/16"-18 UNC right-hand coarse thread facilitates faster assembly and better grip in various materials, enhancing efficiency in production lines.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address common industrial challenges, such as misalignment and wear in rotating assemblies. The black oxide finish not only boosts corrosion resistance but also reduces friction, making it ideal for applications in automotive, aerospace, and heavy machinery where exposure to moisture and chemicals is frequent. Its 1" shoulder length with precise tolerances ensures stable pivoting and bearing surfaces, preventing component slippage and extending equipment lifespan. The socket head with knurled texture and hex drive allows for easy access in confined spaces, streamlining maintenance. By combining high tensile strength and Class 3A thread fit, it delivers consistent performance in precision shoulder bolts for linkages, gears, and robotic arms, reducing downtime and enhancing operational safety in demanding environments.

Specification Summary & Compliance

This shoulder screw adheres to strict dimensional accuracy, including a Class 3A thread fit for superior engagement and a shoulder diameter tolerance of -0.004" to -0.002" with length tolerance of -0.005" to 0.005" for precise assembly. It conforms to ASME B18.3 manufacturing specifications 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.