S-90298A812 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh industrial environments.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and mechanical stress.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections in assembly applications.
• Knurled head and 5/16" hex drive provide superior grip and easy installation with standard tools.
• Long 4 1/2" shoulder offers stable alignment and support for rotating parts like gears and pulleys.
• Rockwell B55 hardness delivers excellent durability and wear resistance over extended use.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures safety, quality, and environmental standards are met.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Shoulder Screw is engineered to address critical challenges in precision machinery, such as misalignment and component wear. The 1/2"-13 UNC coarse thread with Class 3A fit provides a tight, reliable fastening solution that resists loosening under vibration, common in automotive and manufacturing equipment. The substantial 4 1/2" shoulder acts as a stable axle or pivot point, reducing friction and extending the life of moving parts like bearings and linkages. Made from corrosion-resistant stainless steel with a passivated finish, it withstands exposure to moisture and chemicals, making it suitable for food processing, marine, and outdoor applications. Its socket head design with knurling ensures easy installation and maintenance, streamlining assembly processes in high-volume production environments.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional tolerances, including a shoulder diameter tolerance of -0.001" to 0.001" and shoulder length tolerance of -0.005" to 0.005". It features a 1/2"-13 UNC coarse thread with Class 3A fit for high accuracy. Manufacturing and quality are governed by ASME B18.3 specifications, and it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industrial reliability.