S-91273A211 3/8"-16 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and reducing maintenance costs.
• Precise component alignment ensured by the 3-1/2" shoulder length with tight tolerances, minimizing assembly errors and improving machine performance.
• High-strength reliability offering 70,000 psi tensile and 35,000 psi shear strength, providing dependable load-bearing capacity in demanding applications.
• Secure, non-slip installation facilitated by the knurled socket head and 3/16" hex drive, allowing for high torque application without tool slippage.
• Durable thread engagement with UNC coarse thread and Class 2A fit, ensuring easy assembly and resistance to vibration loosening.
• Consistent hardness and wear resistance from Rockwell B55 rating, extending the screw's service life under repetitive use.
• Global compliance and safety with RoHS 3 and REACH regulations, making it suitable for international supply chains and sensitive applications.

Professional Applications & Engineering Value

This socket head shoulder screw is engineered to address critical alignment and strength challenges in industrial applications such as machinery assemblies, pivoting mechanisms, and precision guides. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, essential for operations in humid or chemically exposed environments. The 3-1/2" shoulder length with standard fit allows for accurate positioning of moving parts, reducing wear and misalignment. Combined with a coarse UNC thread and Class 2A thread fit, it ensures quick, secure fastening that withstands vibrations and dynamic loads. The knurled head texture and hex drive enhance grip during installation, preventing damage and ensuring consistent torque in high-stress setups, thereby improving overall equipment reliability and reducing downtime.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for precise, interchangeable assembly. Dimensions include a shoulder diameter of 3/8" with tolerance of -0.004" to -0.002" and shoulder length of 3-1/2" with tolerance of -0.005" to 0.005", ensuring high dimensional accuracy. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free of hazardous substances and suitable for regulated industrial and electronic applications.