S-90337A486 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
• Enhanced wear and galling resistance from the TiCN coating, extending service life in high-friction applications.
• High-strength performance with a tensile strength of 70,000 psi and Rockwell B55 hardness for reliable load-bearing capability.
• Precise component alignment and pivot points ensured by the accurately machined shoulder with a 3/8" diameter and tight tolerances.
• Space-saving low-profile socket head with a hex drive for secure tightening in confined spaces.
• Reliable and coarse 5/16"-18 UNC thread with a Class 2A fit for faster assembly and robust holding power.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global markets.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to solve critical alignment and wear challenges in demanding assemblies. The 18-8 Stainless Steel base material provides excellent resistance to rust and corrosion, while the advanced TiCN coating drastically reduces friction and wear, preventing seizing in dynamic applications such as rotating machinery, pivoting joints, and precision guides. The low-profile socket head with a hex drive allows for easy installation with standard tools, even in tight spaces. The 5/16"-18 UNC coarse thread ensures quick and secure fastening, and the precisely machined shoulder acts as a reliable datum for locating parts like gears, bearings, and linkages, minimizing misalignment and reducing assembly time. This makes it an indispensable industrial fastener for automation, automotive, and aerospace sectors where accuracy and durability are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent, reliable engagement. The shoulder features precise dimensional tolerances (diameter: -0.001" to 0", length: 0" to 0.002") ensuring exact fitment. Manufactured from 18-8 Stainless Steel and finished with a TiCN coating, it meets stringent industry specifications for mechanical properties, including a tensile strength of 70,000 psi. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing it is free from hazardous substances and suitable for use in regulated environments.