S-90298A930 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 Stainless Steel and passivated finish, ideal for harsh environments.
• Precise component alignment ensured by tight shoulder diameter tolerance (±0.001") and length tolerance (±0.005").
• High-strength, wear-resistant performance with Rockwell B55 hardness for demanding applications.
• Secure, reliable fastening provided by Class 3A thread fit, minimizing the risk of loosening.
• Easy installation and removal with a 5/16" hex drive and knurled head for enhanced grip.
• Broad industry compatibility due to compliance with ASME B18.3, RoHS 3, and REACH standards.
• Durable, coarse UNC threading for robust performance in high-vibration settings.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to solve critical alignment and durability challenges in industrial assemblies. The 18-8 Stainless Steel construction, combined with a passivated finish, provides excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive, and outdoor equipment. The 1/2"-13 UNC thread with Class 3A fit ensures secure, vibration-resistant connections, while the precisely machined shoulder (5/8" diameter, 3/4" length) allows for accurate positioning of moving parts like gears and pulleys. The knurled head and hex drive facilitate quick maintenance, reducing downtime in production lines. Ideal for applications requiring heavy-duty performance and strict dimensional control, this screw enhances assembly reliability and longevity.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with 1/2"-13 UNC coarse threads and precise shoulder dimensions (diameter: 5/8" ±0.001", length: 3/4" ±0.005"). Manufactured in accordance with ASME B18.3 specifications, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and sustainability in industrial use.