S-91273A254 5/8"-11 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and extended service life.
• Precise component alignment ensured by the 1-1/2" shoulder with tight diameter and length tolerances for reduced assembly vibration and wear.
• High mechanical strength delivers 70,000 psi tensile and 35,000 psi shear strength, providing reliable performance under heavy loads.
• Easy installation and removal with the hex socket drive and knurled head, allowing for secure tool grip and efficient maintenance.
• Consistent thread engagement via the 5/8"-11 UNC coarse thread with Class 2A fit, ensuring smooth assembly and interchangeability.
• Environmental compliance with RoHS 3 and REACH standards, making it suitable for regulated industries and global supply chains.
• Durable and wear-resistant material with Rockwell B55 hardness, maintaining integrity in high-stress applications.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery. The 18-8 stainless steel offers excellent corrosion resistance, reducing downtime in moist or chemical-exposed settings. Its precision shoulder with tight tolerances (-0.004" to -0.002" diameter, -0.005" to 0.005" length) ensures accurate positioning of components like gears, pulleys, and bearings, minimizing misalignment and wear. The coarse UNC thread and Class 2A fit facilitate quick assembly in high-vibration environments, while the hex socket head and knurled texture provide secure driving for maintenance-heavy applications. Ideal for automation, automotive, and heavy equipment, it delivers long-term reliability and compliance with industry standards.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent performance. Key dimensions include a 0.625" thread diameter, 3/4" thread length, 5/8" shoulder diameter, and 1-1/2" shoulder length, all manufactured to precise tolerances. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and suitability for global industrial use.