S-97832A194 4-40 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.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precise alignment and spacing ensured by the 2 1/4" shoulder with tight length tolerances, reducing assembly errors and improving component fit.
• Secure, high-precision threading with Class 3A UNC coarse threads for robust fastening and vibration resistance in demanding applications.
• Easy installation and removal using the 5/64" hex socket drive and knurled head, providing superior grip and torque application.
• Consistent hardness and durability with a Rockwell B55 rating, maintaining thread integrity and preventing stripping during repeated use.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use across various industries.

Professional Applications & Engineering Value

This 4-40 UNC thread shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial applications. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for machinery, automotive assemblies, and electronic enclosures exposed to moisture or chemicals. The 2 1/4" shoulder length with minimal tolerances allows for precise positioning of moving parts, such as in gears, pulleys, and rotating shafts, reducing wear and ensuring smooth operation. Combined with a Class 3A thread fit and coarse UNC threading, it offers quick assembly and high vibration resistance, minimizing maintenance needs. The hex socket drive and knurled head enhance installation efficiency, while the high tensile and shear strength supports heavy-duty use, delivering long-term reliability and reduced downtime.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise, secure fastening. The shoulder diameter is 1/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 2 1/4" with a tolerance of -0.005" to 0.005", ensuring dimensional accuracy. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting environmentally responsible and safe industrial practices.