S-91247A721 1/2"-13 x 2 1/4" 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
- Superior tensile strength of 120,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Durable zinc plating provides excellent corrosion resistance, extending service life in harsh industrial environments.
- Grade 5 classification and Rockwell C25 hardness guarantee consistent mechanical properties for dependable, repeatable fastening.
- UNC coarse threading with Class 2A fit enables quick assembly and secure engagement, minimizing cross-threading risks.
- Partially threaded design offers optimal clamp force distribution, ideal for applications requiring precise joint integrity.
- External hex drive allows for high-torque installation with standard tools, improving installation efficiency.
- Full compliance with ASME B18.2.1, SAE J429, RoHS 3, and REACH ensures regulatory adherence for global industrial use.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical fastening challenges in heavy machinery, structural assemblies, and equipment manufacturing. The zinc plated steel construction combats corrosion in demanding environments, while the 1/2"-13 UNC coarse thread with Class 2A fit ensures rapid, secure installation without sacrificing strength. The partially threaded shank concentrates clamping force where needed, preventing joint loosening under vibration. With 120,000 psi tensile strength and compliance with ASME B18.2.1, it delivers reliable performance in construction, automotive, and industrial applications where failure is not an option.
Specification Summary & Compliance
This fastener features a 1/2"-13 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy. It meets ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring consistent manufacturing quality. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming adherence to environmental and safety standards for industrial use.
