S-90318A401 10-32 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Precise component alignment ensured by the exact 1/4" shoulder diameter with tight tolerances, reducing assembly errors and improving product reliability.
• High mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for dependable performance under heavy loads.
• Secure, low-profile fastening with the ultra-low hex socket head, providing a flush finish and high torque resistance in confined spaces.
• Reliable thread engagement due to the 10-32 UNF fine thread and Class 2A fit, ensuring vibration resistance and consistent clamping force.
• Enhanced durability and chemical resistance from the passivated finish, protecting against wear and corrosion in demanding applications.
• Compliance with global environmental standards including RoHS 3 and REACH, making it suitable for regulated industries and export markets.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assembly and machinery. Its 10-32 UNF fine thread and Class 2A thread fit provide excellent vibration resistance, preventing loosening in dynamic applications like robotics and automotive systems. The 1/4" shoulder diameter with minimal tolerance ensures accurate positioning of moving parts, reducing wear and misalignment. The passivated finish enhances corrosion resistance, making it ideal for medical devices, marine equipment, and food processing machinery where hygiene and durability are paramount. With a hex socket drive and ultra-low head profile, it allows for easy installation in tight spaces, streamlining maintenance and improving overall engineering efficiency.

Specification Summary & Compliance

This shoulder screw adheres to UNF thread standards with a Class 2A thread fit for precise engagement. The shoulder diameter is maintained at 1/4" with a tolerance of -0.001" to 0", and the shoulder length is 1/4" with a tolerance of 0" to 0.002", ensuring high dimensional accuracy. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting safe and sustainable industrial use.