S-91255A819 1/4"-20 x 3 1/4" 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
- Exceptional tensile strength (120,000 psi) for reliable performance in demanding applications
- Black-oxide coating on alloy steel provides corrosion resistance and durability
- Class 3A thread fit ensures precise, secure fastening with minimal play
- Partially threaded UNC coarse spacing allows for faster installation and better material grip
- Hex drive design (5/32") enables high-torque application with standard tools
- Rounded button head profile offers a finished appearance while reducing snagging risks
- Full compliance with ASME B18.3 and ASTM F835 guarantees industrial-grade quality and interchangeability
Professional Applications & Engineering Value
These black-oxide alloy steel rounded head screws are engineered to address critical fastening challenges in industrial environments. The combination of 120,000 psi tensile strength and Rockwell C39 hardness ensures they withstand vibration, shock loads, and heavy-duty cycling without failure. The partially threaded design with UNC coarse spacing provides superior grip in various materials while allowing for quick assembly. The hex drive configuration delivers maximum torque transfer during installation, preventing stripping and ensuring consistent clamping force. Ideal for machinery, equipment assembly, and structural applications where reliable fastening and corrosion resistance are paramount, these screws maintain integrity in demanding conditions while meeting rigorous industry standards.
Specification Summary & Compliance
This 1/4"-20 x 3-1/4" rounded head screw features Class 3A thread fit precision with UNC coarse thread spacing and partial threading. Manufactured to ASME B18.3 and ASTM F835 specifications, it ensures dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict material safety standards.
