S-91283A325 1 1/4"-12 x 7" 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
- High tensile strength of 100,000 psi ensures reliable performance in heavy-load applications, reducing the risk of fastener failure.
- Grade 5 steel construction with Rockwell C19 hardness provides excellent durability and resistance to wear in demanding industrial environments.
- 1 1/4"-12 UNF fine threads with Class 2A fit offer superior vibration resistance and secure fastening in precision assemblies.
- Partially threaded design allows for controlled clamping force and easier alignment in structural applications.
- External hex drive and large head size (1 7/8" width) facilitate quick installation and removal with standard tools, saving time on the job site.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability for engineering projects.
- RoHS 3 and REACH compliant ensures environmental safety and regulatory adherence for global supply chains.
Professional Applications & Engineering Value
This Grade 5 steel hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where vibration resistance and high tensile strength are paramount. The 1 1/4"-12 UNF fine thread configuration minimizes loosening under dynamic loads, while the partially threaded shank concentrates stress away from the thread roots, enhancing fatigue life. Made from robust steel with a Rockwell C19 hardness, it withstands harsh conditions without compromising integrity. Ideal for securing structural components, this 7-inch heavy-duty fastener delivers reliable performance in applications demanding precision and durability, supported by ASME B18.2.1 standards for consistent engineering outcomes.
Specification Summary & Compliance
This screw features a 1 1/4"-12 UNF thread with Class 2A thread fit for precise tolerance, a 7" length, and partial threading over a minimum of 3 inches. It conforms to ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. Additionally, it is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
