S-91247A555 1/4"-20 x 3 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
- Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion resistance through zinc plating, extending service life in various industrial environments
- Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and secure fastening
- Enhanced durability with Rockwell C25 hardness, maintaining structural integrity under repeated stress
- Secure external hex drive providing positive tool engagement and high torque transmission capability
- Industry-standard compliance meeting ASME B18.2.1 specifications for consistent quality and interchangeability
- Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers exceptional engineering value through its zinc plated steel construction and UNC coarse threading. The combination of 120,000 psi tensile strength and Rockwell C25 hardness makes it ideal for heavy machinery, structural assemblies, and equipment manufacturing where vibration resistance and joint integrity are critical. The partially threaded design allows for precise clamping force distribution, while the external hex drive ensures efficient installation in confined spaces. Meeting ASME B18.2.1 standards, this fastener provides reliable performance in construction, automotive, and industrial maintenance applications where consistent quality and dimensional accuracy are paramount for safety and longevity.
Specification Summary & Compliance
This 1/4"-20 x 3-1/4" hex head screw features Class 2A thread fit tolerance for proper assembly clearance and UNC coarse thread specification. Manufactured to ASME B18.2.1 standards and SAE J429 Grade 5 requirements, it ensures dimensional consistency and mechanical performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for use in regulated industries and international markets.
