S-91306A373 1/4"-20 x 3/8" ASTM F835 Steel Button Head Hex-Drive Screws
Steel Button Head Hex-Drive 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 corrosion resistance with zinc-plated alloy steel construction, ensuring long-lasting performance in harsh industrial environments.
- High tensile strength of 120,000 psi provides reliable load-bearing capacity and resistance to deformation under stress.
- Precision Class 3A thread fit ensures tight, secure fastening with minimal risk of loosening in critical applications.
- Hex drive design (5/32") allows for easy installation and removal with standard tools, reducing assembly time.
- Fully threaded UNC coarse spacing enables quick engagement and strong holding power in various materials.
- Rounded button head profile offers a low-profile, aesthetically pleasing finish while minimizing snagging risks.
- Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interoperability in professional settings.
Professional Applications & Engineering Value
This zinc-plated alloy steel rounded head screw is engineered to address common industrial challenges such as vibration-induced loosening and environmental corrosion. The Class 3A thread fit and UNC coarse thread spacing provide exceptional grip and rapid installation in machinery, automotive assemblies, and structural frameworks. With a tensile strength of 120,000 psi and Rockwell C39 hardness, it withstands heavy loads and repetitive stress, making it ideal for high-stakes applications where fastener failure is not an option. The hex drive ensures torque efficiency, while the fully threaded design maximizes contact area for enhanced stability in industrial and commercial projects.
Specification Summary & Compliance
This screw features precise Class 3A thread fit per UNC standards, with dimensions including a 1/4"-20 thread size, 3/8" length, and coarse spacing for optimal performance. It meets ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and mechanical reliability. Additionally, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, supporting environmentally responsible and safe usage in global markets.
