S-91829A304 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-lasting performance in harsh industrial environments.
• Precise alignment and smooth rotation due to the accurately machined shoulder with minimal diameter and length tolerances, reducing wear on mating parts.
• High-strength reliability with a tensile strength of 70,000 psi and Rockwell B55 hardness, providing dependable performance under heavy loads.
• Secure and efficient driving using the socket head design, allowing for high torque application and reducing the risk of stripping compared to standard heads.
• Wide compatibility and easy assembly with the standard 1/4"-20 UNC coarse thread and Class 2A fit, ensuring consistent engagement in various applications.
• Environmental and regulatory compliance by meeting RoHS 3 and REACH standards, making it suitable for global markets and sensitive applications.
• Durable thread integrity with right-hand coarse threading, offering excellent resistance to loosening in high-vibration settings.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to address common challenges in machinery assembly, such as misalignment and component wear. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to rust and corrosion, extending service life in demanding conditions like automotive, aerospace, and manufacturing equipment. The socket head design allows for compact installation and high torque application, while the precisely controlled shoulder diameter and length ensure accurate positioning of parts like gears, pulleys, and linkages. This reduces friction, minimizes maintenance, and enhances overall system reliability, making it an ideal choice for industrial applications requiring robust and repeatable performance.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent and reliable fastening. Key dimensions include a shoulder diameter of 5/16" (with tolerance from -0.001" to 0") and shoulder length of 1/2" (tolerance 0" to 0.002"), ensuring precise assembly. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting use in regulated industries and promoting environmental safety.