S-90298A589 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel and passivated finish for long-lasting performance in harsh industrial environments.
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity and durability in demanding applications.
• Precise Class 3A thread fit provides secure, vibration-resistant fastening with minimal risk of loosening.
• Knurled head design offers improved grip for easier manual installation and adjustment without tools.
• Hex socket drive (5/32") allows for high-torque installation in confined spaces with standard tools.
• Tight shoulder tolerances (±0.001" diameter, ±0.005" length) ensure accurate alignment and consistent performance in precision assemblies.
• Full regulatory compliance with ASME B18.3, RoHS 3, and REACH standards for safe use across global industries.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw with UNC coarse thread and passivated finish addresses critical engineering challenges in industrial machinery, automation systems, and precision equipment. The 1/4"-20 thread size with Class 3A fit provides superior vibration resistance in high-stress applications, while the precisely machined shoulder maintains accurate component alignment in rotating assemblies and bearing mounts. The knurled head texture combined with hex socket drive enables quick assembly in hard-to-reach areas, reducing installation time. Ideal for robotics, conveyor systems, and tooling fixtures, this screw's 70,000 psi tensile strength and corrosion-resistant properties ensure long-term reliability in demanding operational conditions.

Specification Summary & Compliance

Manufactured to exacting standards, this shoulder screw features Class 3A thread fit with UNC coarse threading (1/4"-20) and maintains tight shoulder diameter tolerance of -0.001" to 0.001" and length tolerance of -0.005" to 0.005". The component fully complies with ASME B18.3 specifications for dimensional accuracy and is certified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant for environmental safety and regulatory adherence in industrial applications worldwide.