S-90298A822 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Exceptional precision and alignment with a 2 3/4" shoulder length and tight ±0.005" tolerance for reliable component positioning.
• High-strength, wear-resistant performance from Rockwell B55 hardness, ensuring long-term durability under heavy loads.
• Secure, vibration-resistant fastening with Class 3A thread fit and coarse 1/2"-13 UNC thread for superior holding power.
• Easy installation and removal using a standard 5/16" hex drive and knurled head for improved grip.
• Guaranteed dimensional consistency as it meets ASME B18.3 specifications, ensuring interchangeability.
• Safe for regulated industries with full compliance to RoHS 3 and REACH environmental standards.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to solve critical alignment and load-bearing challenges in precision machinery. The 2 3/4" shoulder length with minimal tolerance provides a stable pivot or axle, reducing wear in rotating assemblies and ensuring accurate part location. The Class 3A thread fit and coarse UNC thread offer excellent resistance to loosening under vibration, making it ideal for heavy-duty equipment, automation systems, and conveyor mechanisms. The passivated finish enhances corrosion resistance, extending service life in moist or chemically aggressive environments. Its socket head with knurling allows for secure tool engagement and manual adjustment, streamlining maintenance in confined spaces.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC coarse thread with Class 3A fit for precise engagement, a shoulder diameter of 5/8" with a tight tolerance of -0.001" to 0.001", and a shoulder length of 2 3/4" held to ±0.005". Manufactured in accordance with ASME B18.3 standards, it ensures dimensional accuracy and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing it is free from hazardous substances for safe use across global markets.