S-90311A138 8-32 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure
• Permanent vibration resistance through the nylon patch thread locker, preventing loosening under dynamic loads from -50° to 250°F
• High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding mechanical applications
• Precise alignment and smooth rotation enabled by the 3/16" shoulder diameter and 3/4" shoulder length with tight tolerances
• Easy installation and removal using the standard hex socket drive and knurled head for enhanced grip
• Reliable thread engagement with Class 3A UNC coarse threads ensuring consistent fit and reduced cross-threading risk
• Compliance with global standards including RoHS 3 and REACH, meeting environmental and safety regulations

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assemblies, such as maintaining alignment in rotating machinery and securing components in high-vibration environments. The nylon patch thread locker provides a permanent locking mechanism that withstands thermal cycling from -50° to 250°F, eliminating the need for secondary locking devices. With its Class 3A UNC coarse thread and precisely machined shoulder, it ensures minimal backlash and smooth pivoting in applications like conveyor systems, automotive fixtures, and electronic enclosures. The combination of high tensile strength and corrosion-resistant material makes it suitable for marine, chemical processing, and food equipment where durability and hygiene are paramount.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC coarse threads (8-32 size) and a shoulder diameter of 3/16" (tolerance: -0.004" to -0.002") and length of 3/4" (tolerance: -0.005" to 0.005"). Manufactured to high precision standards, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability.