S-91247A318 7/16"-20 x 1 3/4" 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 industrial applications, reducing the risk of fastener failure.
- Zinc plating provides superior corrosion resistance, extending the screw's service life in harsh or outdoor environments.
- Grade 5 steel construction with Rockwell C25 hardness offers excellent durability and resistance to wear and deformation.
- Partially threaded UNF fine thread design allows for precise clamping force and secure fastening in assemblies requiring controlled thread engagement.
- External hex drive and standard hex head enable easy installation and removal with common tools, improving assembly efficiency.
- Class 2A thread fit ensures consistent, reliable threading with standard nuts and tapped holes, minimizing cross-threading issues.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees interchangeability and consistent quality for industrial use.
Professional Applications & Engineering Value
This 7/16-20 UNF hex head screw is engineered to address critical fastening challenges in demanding environments. The Grade 5 steel material, combined with a zinc-plated finish, provides robust resistance to corrosion and mechanical stress, making it ideal for automotive, machinery, and structural applications where high tensile strength and longevity are paramount. The partially threaded design with UNF fine threads ensures secure, vibration-resistant joints, while the external hex drive facilitates quick installation in confined spaces. By meeting rigorous industry standards, this fastener delivers reliable performance, reducing maintenance needs and enhancing the safety of assembled components.
Specification Summary & Compliance
This screw features a 1 3/4" length with a min thread length of 1 1/8", Class 2A thread fit for precise tolerance, and UNF fine threading (7/16-20) per standard specifications. It complies with ASME B18.2.1 and SAE J429 manufacturing standards, ensuring dimensional accuracy and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
