S-91247A501 1"-14 x 8" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance provided by zinc plating extends service life and maintains integrity in harsh or outdoor environments.
• Precise Class 2A thread fit with extra fine 1"-14 threading offers excellent vibration resistance and secure fastening in dynamic conditions.
• High hardness rating (Rockwell C25) enhances durability and wear resistance, minimizing deformation during installation and use.
• Partially threaded design allows for controlled clamping force and improved joint stability in structural assemblies.
• External hex drive and hex head facilitate easy installation and removal with standard tools, increasing efficiency in maintenance and assembly lines.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability in regulated industrial settings.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive sectors, where vibration loosening and material fatigue are common concerns. The extra fine thread spacing (1"-14) provides a tighter grip and superior resistance to shock and dynamic loads, making it ideal for precision equipment and structural frameworks. Constructed from zinc plated steel, it combats corrosion in humid or chemically aggressive environments, ensuring long-term reliability. The partially threaded configuration allows for optimal stress distribution, reducing the risk of thread stripping in high-torque applications. By integrating external hex drive design, it enables quick assembly with common tools, streamlining production workflows and minimizing downtime in industrial maintenance.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNS thread type with right-hand direction. It meets ASME B18.2.1 and SAE J429 specifications for Grade 5 mechanical properties, ensuring high tensile strength and hardness. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible and safe usage in global industrial supply chains.