S-90429A137 7/16"-20 x 1 3/4" 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 under high-stress industrial conditions
- Precision Class 3A thread fit provides superior engagement and vibration resistance in critical applications
- Black-oxide surface treatment on alloy steel offers enhanced corrosion protection for extended service life
- 82° countersink angle with standard flat head profile enables flush mounting and clean aesthetic finishes
- Fully threaded design maximizes grip length and distributes clamping force evenly across the entire fastener
- 1/4" hex drive compatibility allows for efficient installation with standard industrial tools
- Fine UNF threading (20 TPI) delivers superior holding power in materials prone to vibration loosening
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these black-oxide alloy steel flat head screws solve critical fastening challenges where vibration resistance and corrosion protection are paramount. The Class 3A UNF fine thread specification ensures precise fitment in machinery, automotive assemblies, and precision equipment where tolerance control is essential. The 82° countersink angle facilitates seamless integration into tapered recesses, eliminating protrusions in applications requiring aerodynamic surfaces or safety clearance. With 130,000 psi tensile strength and Rockwell C39 hardness, these fasteners maintain integrity in high-load scenarios while the black-oxide finish provides durable protection against environmental degradation in manufacturing, construction, and heavy equipment applications.
Specification Summary & Compliance
This 7/16"-20 UNF flat head screw features precision Class 3A thread tolerances with right-hand threading and fine thread spacing. Manufactured to ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, making them suitable for regulated industries and international markets. The 1 3/4" length with fully threaded design provides consistent performance across the entire fastener engagement area.
