S-91253A879 5/8"-18 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 corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Superior tensile strength (130,000 psi) prevents fastener failure under extreme mechanical loads
- Precision Class 3A fine threading ensures secure, vibration-resistant connections in critical assemblies
- Optimized 82° countersink angle provides flush mounting for streamlined surfaces and reduced snagging
- High-torque 3/8" hex drive enables quick installation and removal with standard industrial tools
- Full threading along 3" length offers maximum adjustability and holding power across material thicknesses
- Rockwell C37 hardness rating maintains structural integrity against wear and deformation
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these black-oxide alloy steel flat head screws address common challenges in machinery assembly, structural framing, and equipment manufacturing. The UNF fine thread configuration delivers enhanced clamping force distribution, reducing the risk of loosening in high-vibration environments. Combined with the 82° countersink profile, they create seamless transitions in precision-machined components while the hex drive design withstands repeated torque applications. The alloy steel construction provides reliable performance in load-bearing joints where 130,000 psi tensile strength prevents catastrophic fastener failure, making them ideal for automotive, construction, and industrial machinery sectors requiring ASTM F835 compliant fastening solutions.
Specification Summary & Compliance
Manufactured to Class 3A thread fit tolerances with 5/8"-18 UNF fine threading and full thread engagement. Complies with ASTM F835 specifications for mechanical properties and dimensional requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries.
