S-92655A638 5/8"-11 x 5 1/2" ASTM A193 18-8 Stainless Steel Heavy Hex Head Screws for High-Pressure Applications

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction, ensuring long-term reliability in harsh environments
• Exceptional tensile strength rated at 75,000 psi for heavy-duty applications requiring secure, permanent fastening
• Optimized partial threading with 1½" thread length and 4" grip length provides precise clamping control and vibration resistance
• Industry-standard compliance with ASTM A193 Grade B8 certification for consistent quality and performance in high-temperature applications
• Easy installation and removal with external hex drive and 1-1/16" head width for standard tool compatibility
• Reliable thread engagement with Class 2A UNC coarse threads ensuring smooth assembly and reduced cross-threading risk
• Durable mechanical properties with Rockwell B100 hardness balancing strength with necessary ductility

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 5/8"-11 UNC hex head screws solve critical fastening challenges where corrosion resistance and structural integrity are paramount. The 18-8 stainless steel composition provides excellent protection against chemical exposure and atmospheric corrosion, making these partially threaded fasteners ideal for petrochemical plants, marine equipment, and food processing machinery. The coarse thread design ensures rapid installation in tough materials while maintaining Class 2A thread fit precision for consistent clamping force. With ASTM A193 Grade B8 certification, these external hex drive screws deliver reliable performance in high-temperature applications up to 1400°F, preventing joint failure in critical assemblies where thermal cycling occurs.

Specification Summary & Compliance

This 5/8"-11 UNC hex head screw features precise Class 2A thread fit tolerances with right-hand coarse threading and partial threading configuration. Manufacturing complies with ASTM A193 Grade B8 specifications for chemical and mechanical properties, ensuring consistent performance in pressure vessels, valve assemblies, and flanged connections. The fastener meets industry standards for dimensional accuracy with 0.625" thread diameter, 1½" thread length, and 5½" overall length. Material composition and manufacturing processes adhere to RoHS and REACH environmental compliance requirements.