S-91247A886 7/8"-9 x 3 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
- Superior tensile strength of 120,000 psi ensures reliable performance under heavy loads, reducing the risk of fastener failure in demanding applications.
- Zinc plating provides excellent corrosion resistance, extending the service life of the screw in harsh industrial environments.
- Coarse UNC threads and Class 2A fit offer faster assembly and better vibration resistance compared to fine threads.
- Grade 5 steel construction with Rockwell C25 hardness delivers optimal durability and resistance to wear and deformation.
- External hex drive design allows for high-torque installation with standard tools, improving installation efficiency.
- Partial threading provides unthreaded shank for enhanced shear strength where needed in structural applications.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability in industrial systems.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical fastening challenges in heavy machinery, construction, and automotive assemblies. The 7/8"-9 UNC coarse thread configuration ensures quick installation and superior resistance to loosening under vibration, while the zinc plated finish protects against rust and corrosion in outdoor or humid conditions. Made from high-strength steel with a Rockwell C25 hardness, it maintains integrity under high stress, making it ideal for industrial applications such as structural frames, equipment mounting, and load-bearing connections. The external hex drive facilitates easy tightening with common tools, reducing assembly time and labor costs.
Specification Summary & Compliance
This screw features a 3 1/2" length with 2" minimum thread length and Class 2A thread fit per UNC standards, ensuring precise dimensional accuracy. It meets ASME B18.2.1 and SAE J429 specifications for consistent performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances.
