S-91255A641 3/8"-24 x 1/2" 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 of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in critical assemblies.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh environments.
- Fine UNF thread spacing allows for finer adjustments and stronger holding power in thin materials or high-stress joints.
- Fully threaded design ensures consistent clamping force along the entire length, improving load distribution and assembly integrity.
- Rounded button head with hex drive enables easy installation and a low-profile finish, reducing snagging and improving aesthetics.
- High hardness (Rockwell C39) resists wear and deformation, maintaining fastener integrity through repeated use and high torque.
Professional Applications & Engineering Value
These Black-Oxide Alloy Steel rounded head hex screws are engineered to address common industrial challenges such as vibration-induced loosening and corrosion in machinery, automotive, and aerospace assemblies. The Class 3A UNF fine thread provides excellent grip in precision components, while the high tensile strength and hardness ensure durability under dynamic loads. Ideal for applications requiring reliable fastening in confined spaces, the low-profile button head and hex drive facilitate quick installation with standard tools, reducing assembly time and improving operational efficiency in industrial fastener systems.
Specification Summary & Compliance
This screw features precise Class 3A thread fit with UNF fine threading, a length of 1/2", and full threading for consistent performance. It complies with ASME B18.3 and ASTM F835 standards, ensuring dimensional accuracy and manufacturing quality. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental and safety compliance for global industrial use.
