S-91327A266 5/8"-11 Shoulder Screws

Key Features & Benefits at a Glance

• Secure Vibration Resistance: Integrated nylon patch thread locker maintains clamping force from -50° to 250°F, preventing loosening in high-vibration environments
• Superior Corrosion Resistance: 18-8 stainless steel construction with passivated finish provides excellent protection against rust and chemical degradation
• Precise Alignment & Bearing Surface: 3/4" shoulder diameter with tight tolerance ensures accurate component positioning and smooth rotational movement
• High-Strength Performance: 70,000 psi tensile strength and Rockwell B55 hardness deliver reliable load-bearing capacity for demanding applications
• Enhanced Grip & Installation: Knurled head texture provides superior tool grip while hex socket drive allows for high-torque installation
• Industry-Standard Compatibility: UNC coarse thread with Class 3A fit ensures perfect interchangeability and reliable engagement in standard components
• Environmental Compliance Ready: Meets RoHS 3 and REACH standards for use in regulated industries and international markets

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw delivers exceptional engineering value in precision assembly applications where both alignment security and vibration resistance are critical. The 18-8 stainless steel material with passivated finish provides superior corrosion resistance for harsh industrial environments, while the integrated nylon patch locking mechanism eliminates the need for separate locking hardware. The precision-machined shoulder serves as both an alignment dowel and bearing surface, making it ideal for rotating assemblies, machinery linkages, and precision fixturing. With its Class 3A thread fit and coarse thread spacing, this fastener ensures quick assembly and disassembly while maintaining consistent performance in high-cycle applications across automotive, manufacturing, and industrial equipment sectors.

Specification Summary & Compliance

This industrial shoulder screw features precision Class 3A thread fit with UNC coarse thread specifications (5/8"-11). The shoulder diameter maintains tight tolerance of -0.004" to -0.002" for exacting alignment requirements. Manufactured to industry standards with Rockwell B55 hardness and 70,000 psi tensile strength, this fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global markets and regulated industries.