S-94705A814 1 1/8"-8 x 4" ASTM A193 Steel Heavy Hex Head Screws for High-Pressure Applications

Key Features & Benefits at a Glance

• Exceptional tensile strength of 125,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• ASTM Grade B7 steel construction provides superior durability and resistance to high temperatures and pressures, ideal for demanding environments.
• Class 2A thread fit offers precise installation with consistent engagement, minimizing cross-threading and ensuring secure connections.
• Partially threaded design with a 1 1/2" grip length allows for controlled clamping force and vibration resistance in assembled components.
• External hex drive and hex head facilitate easy installation and removal with standard tools, improving maintenance efficiency.
• UN fine threads (1 1/8"-8) deliver enhanced holding power and better load distribution compared to coarse threads, increasing joint integrity.
• Rockwell C35 hardness ensures long-term wear resistance and maintains mechanical properties under repetitive stress.

Professional Applications & Engineering Value

This high-strength hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as pressure vessels, structural assemblies, and machinery requiring reliable fastening solutions. Made from ASTM A193 Grade B7 steel, it withstands extreme temperatures and mechanical loads, preventing loosening and fatigue in dynamic applications. The 1 1/8"-8 UN fine thread and partially threaded configuration provide optimal stress distribution and vibration resistance, reducing maintenance downtime. With an external hex drive for straightforward installation, this screw ensures efficient assembly in construction, oil and gas, and manufacturing sectors, delivering consistent performance where precision and durability are paramount.

Specification Summary & Compliance

This product adheres to Class 2A thread fit tolerances for precise alignment and meets ASTM A193 specifications for material and manufacturing standards. It complies with industry requirements for high-strength fasteners, including dimensional accuracy in inch measurements, and is suitable for applications demanding 125,000 PSI tensile strength and Rockwell C35 hardness. The screw conforms to relevant regulations for quality and safety in industrial use.