S-94705A829 1 1/4"-8 x 3" ASTM A193 Steel Heavy Hex Head Screws for High-Pressure Applications

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 125,000 PSI tensile strength for reliable performance in high-stress environments
• Superior corrosion and wear resistance through ASTM Grade B7 steel construction and Rockwell C35 hardness
• Precise installation and secure fit with Class 2A thread tolerance ensuring consistent engagement and vibration resistance
• Optimized for high-torque applications featuring a 2" external hex head for maximum tool grip and efficient tightening
• Enhanced thread engagement with UN fine threading providing superior clamping force distribution
• Full-thread design offering maximum holding power along the entire 3" length for critical connections
• Industry compliance assurance meeting ASTM A193 specifications for high-temperature and high-pressure service

Professional Applications & Engineering Value

This 1 1/4"-8 hex head screw delivers critical engineering solutions for demanding industrial applications where failure is not an option. The ASTM Grade B7 steel construction provides exceptional strength retention under extreme temperatures and pressures, making it ideal for pressure vessels, valve systems, and structural connections. The UN fine thread configuration with Class 2A fit ensures precise alignment and superior vibration resistance in machinery and equipment. The external hex drive design allows for high-torque installation in confined spaces, while the fully threaded 3-inch length maximizes load distribution. These heavy-duty industrial fasteners are engineered to prevent joint failure in critical infrastructure, chemical processing plants, and power generation equipment where reliability is paramount.

Specification Summary & Compliance

This hex head screw maintains Class 2A thread fit tolerance for precise assembly according to UN standards. Manufacturing and material specifications fully comply with ASTM A193 requirements for high-temperature service. The inch-system fasteners feature a 1 1/4"-8 fine thread with right-hand direction and are manufactured from ASTM Grade B7 steel with verified mechanical properties including 125,000 PSI tensile strength and Rockwell C35 hardness. The product meets industry standards for heavy-duty industrial applications requiring certified material traceability and performance verification.