S-91253A898 7/8"-9 x 3" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat Head 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 130,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable finish, extending the screw's service life.
- Hex drive (9/16") design allows for high-torque installation with common tools, speeding up assembly and reducing labor time.
- Fully threaded UNC coarse thread enables faster driving and improved grip in a variety of materials, enhancing installation efficiency.
- 82° countersink angle and flat head provide a flush, low-profile finish, ideal for applications where a smooth surface is critical.
- Compliance with ASTM F835, RoHS 3, and REACH ensures the screw meets rigorous industry standards for safety and environmental responsibility.
Professional Applications & Engineering Value
This black-oxide alloy steel flat head screw is engineered to address common industrial challenges such as vibration loosening and corrosion in heavy machinery, construction, and automotive assemblies. The Class 3A thread fit and coarse UNC threading deliver secure fastening even under dynamic loads, while the hex drive simplifies installation in tight spaces. With a Rockwell C37 hardness and 130,000 PSI tensile strength, it withstands extreme forces, making it ideal for structural applications where durability and reliability are paramount. The fully threaded design and 82° countersink ensure consistent performance and a clean finish, reducing maintenance needs over time.
Specification Summary & Compliance
This screw features a 7/8"-9 UNC coarse thread with Class 3A fit for precise tolerances, and is fully threaded for uniform engagement. It complies with ASTM F835 specifications for mechanical properties, and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets environmental and safety standards for industrial use.
