S-92949A582 5/16"-18 x 1" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Precise Class 3A thread fit ensures secure, vibration-resistant connections in demanding assemblies
• Quick installation with hex drive (3/16" drive size) providing superior torque transmission and reduced tool slippage
• Full threading capability enables maximum grip length and uniform load distribution across the entire fastener
• Compliant with major industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and safety
• Optimized button head design combines low-profile aesthetics with rounded head profile for reduced snagging risks

Professional Applications & Engineering Value

This 5/16"-18 UNC fully threaded screw delivers critical performance advantages in industrial fastening applications where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 stainless steel material with passivated finish provides exceptional protection against chemical exposure and environmental degradation, significantly extending service life in manufacturing equipment, marine components, and food processing machinery. The coarse UNC thread with Class 3A fit ensures rapid assembly and maintains clamping force under vibration, while the rounded button head with hex drive offers both aesthetic appeal and practical installation benefits. Engineers specify this fastener for applications requiring consistent performance in demanding conditions, from heavy machinery assemblies to structural frameworks where fastener failure is not an option.

Specification Summary & Compliance

This fastener maintains precise dimensional accuracy with Class 3A thread fit per UNC standards, ensuring tight tolerances for critical applications. Manufacturing complies with ASME B18.3 specifications for dimensional consistency and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) compliance for chemical safety, making it suitable for regulated industries worldwide. Thread specifications include 5/16"-18 UNC coarse thread with full threading along the 1" length, providing reliable engagement across the entire fastener.