S-91255A551 1/4"-28 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
- Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability for extended service life in harsh conditions.
- Hex drive design (5/32") allows for efficient torque application and secure installation with standard tools.
- Fully threaded construction ensures consistent holding power along the entire 3/8" length for uniform load distribution.
- Rounded button head profile delivers a low-profile, finished appearance while reducing surface snagging risks.
- Compliance with major industry standards including ASME B18.3 and ASTM F835 guarantees consistent quality and interchangeability.
Professional Applications & Engineering Value
This black-oxide alloy steel rounded head screw with 1/4"-28 UNF fine threads is engineered to address critical industrial fastening challenges. The Class 3A thread fit provides exceptional precision for applications requiring vibration resistance and reliable sealing, such as in precision machinery, automotive assemblies, and electronic enclosures. The combination of 120,000 psi tensile strength and Rockwell C39 hardness ensures durability against mechanical stresses, while the hex drive facilitates quick installation in confined spaces. Ideal for OEM manufacturing and maintenance operations, these screws maintain integrity in demanding environments where fine thread engagement and corrosion protection are paramount.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerances with UNF thread type and right-hand direction. Complies with ASME B18.3 and ASTM F835 specifications for dimensional consistency and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safe use in regulated industries.
