S-91255A568 1/4"-28 x 2" 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: Withstands up to 120,000 psi, providing reliable performance in high-stress industrial applications.
- Superior Corrosion Resistance: Black-oxide coating on alloy steel enhances durability and longevity in harsh environments.
- Precision Thread Fit: Class 3A UNF fine threads ensure tight, secure fastening with minimal risk of loosening or stripping.
- Easy Installation and Removal: Hex drive (5/32") allows for quick, tool-friendly assembly and disassembly with standard wrenches.
- Optimized Load Distribution: Rounded button head design reduces surface pressure and prevents damage to connected materials.
- Full Thread Engagement: Fully threaded 2" length maximizes grip strength and stability across the entire fastener.
- High Hardness Rating: Rockwell C39 hardness ensures resistance to wear and deformation under repeated use.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Rounded Head Hex Screw is engineered to address critical fastening challenges in demanding sectors like machinery assembly, automotive manufacturing, and heavy equipment. The UNF fine thread and Class 3A fit provide exceptional vibration resistance, reducing maintenance needs in dynamic environments. The black-oxide surface treatment offers enhanced corrosion protection, extending service life even in exposed or humid conditions. With a rounded button head and hex drive, it ensures easy access and installation in confined spaces, while the high tensile strength and hardness prevent failure under load. Ideal for precision applications requiring reliable, long-term fastening solutions.
Specification Summary & Compliance
This screw features a 1/4"-28 UNF fine thread with Class 3A tolerance for precise fit, a length of 2", and is fully threaded. It complies with ASME B18.3 and ASTM F835 standards, ensuring consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting safe and sustainable industrial use.
