S-91247A929 1"-8 x 6 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Zinc plating provides superior corrosion resistance, extending the service life of the screw in harsh industrial environments.
- Grade 5 strength classification and Rockwell C25 hardness offer a robust balance of strength and toughness for demanding mechanical assemblies.
- Coarse UNC threading with Class 2A fit allows for quicker installation and better vibration resistance compared to fine threads.
- Partially threaded design concentrates clamping force where needed, improving joint integrity and preventing loosening.
- External hex drive and standard head dimensions ensure compatibility with common tools, speeding up assembly and maintenance.
- Compliance with ASME B18.2.1 and environmental standards guarantees consistent quality and safe use in regulated industries.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as structural steel connections, machinery assembly, and construction projects. Its 1"-8 UNC coarse thread and Class 2A thread fit provide excellent grip and vibration resistance, minimizing the need for frequent retightening in dynamic environments. The zinc plated steel construction combats rust and corrosion, making it ideal for outdoor or humid conditions. With a partially threaded shank, it ensures precise clamping without thread interference, enhancing the reliability of bolted joints in equipment frames, vehicle components, and infrastructure supports where high tensile strength and durability are paramount.
Specification Summary & Compliance
This screw adheres to precise dimensional standards, including Class 2A thread fit and UNC coarse threading with a 1"-8 size. It is manufactured in compliance with ASME B18.2.1 and SAE J429 specifications for Grade 5 fasteners. Additionally, it meets regulatory requirements such as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring environmental safety and suitability for global industrial markets.
