S-91255A540 1/4"-20 x 3/4" 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 corrosion resistance from the black-oxide finish, extending service life in demanding industrial environments.
- Superior mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for reliable performance under high stress.
- Precise, secure fastening ensured by the Class 3A thread fit, minimizing the risk of loosening in critical assemblies.
- Efficient installation and removal with the 5/32" hex drive, providing a positive grip for high-torque applications.
- Versatile coarse UNC threading offers rapid installation and robust holding power in a wide range of materials.
- Fully threaded design maximizes engagement length for a stronger, more consistent clamp across the entire fastener.
- Comprehensive industry compliance guarantees material safety and meets rigorous engineering specifications for global projects.
Professional Applications & Engineering Value
This black-oxide alloy steel rounded head screw is engineered to solve critical challenges in industrial assembly and heavy machinery. The Class 3A UNC coarse thread provides excellent resistance to vibration loosening, making it ideal for dynamic load applications in automotive, construction, and manufacturing equipment. The fully threaded design ensures uniform stress distribution, while the rounded (button) head offers a low-profile, finished appearance that reduces snagging hazards. Combined with a high tensile strength of 120,000 psi, this fastener delivers reliable, long-term performance in corrosive or high-stress environments where failure is not an option.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with Class 3A fit and coarse spacing for precise dimensional accuracy. It is manufactured in compliance with ASME B18.3 and ASTM F835 standards, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.
