S-91273A225 3/8"-24 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Precise component alignment ensured by the 1 1/4" shoulder with controlled diameter tolerance for reliable locating and pivoting functions.
• High-strength performance with a tensile strength of 70,000 psi and Rockwell B55 hardness, providing dependable load-bearing capacity.
• Secure and non-slip fastening thanks to the knurled socket head and 3/16" hex drive, allowing for high-torque installation.
• Accurate and reliable thread engagement with a Class 2A fit and 3/8"-24 UNF fine thread, reducing the risk of cross-threading.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring suitability for global markets and sensitive applications.
• Optimized for machinery assembly with a right-hand thread and standard shoulder fit, facilitating straightforward installation and maintenance.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical challenges in industrial machinery and precision equipment assembly. The 3/8"-24 UNF fine thread provides superior resistance to vibration loosening compared to coarse threads, which is essential for dynamic applications. The 1 1/4" shoulder length acts as a precise axle or pivot, maintaining accurate alignment between components like gears, linkages, and bearings, thereby reducing wear and preventing misalignment. The knurled socket head with a 3/16" hex drive ensures a firm grip for tools, even in greasy conditions, preventing cam-out during high-torque installation. Manufactured from corrosion-resistant 18-8 stainless steel, it delivers long-term reliability in demanding environments, from food processing to automotive manufacturing.

Specification Summary & Compliance

This shoulder screw adheres to Class 2A thread fit for consistent and reliable assembly. The shoulder features a diameter tolerance of -0.004" to -0.002" and a length tolerance of -0.005" to 0.005" for precision fitting. It conforms to the UNF (Unified National Fine) thread standard. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent international regulations for hazardous substances.