S-90429A127 6-40 x 1" 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
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Exceptional tensile strength (130,000 psi) ensures reliable performance under high-stress applications
- Precision Class 3A thread fit provides secure, vibration-resistant fastening in critical assemblies
- Full threading design offers maximum engagement and holding power across the entire screw length
- 82° countersink angle enables flush mounting for streamlined surfaces and improved aesthetics
- Hex drive compatibility allows for high-torque installation with standard industrial tools
- Rockwell C39 hardness maintains structural integrity and prevents deformation during installation
Professional Applications & Engineering Value
Engineered for precision industrial applications, these 6-40 UNF flat head screws with hex drive configuration solve critical fastening challenges in machinery, electronics, and automotive assemblies. The black-oxide alloy steel construction provides exceptional corrosion protection while maintaining the 130,000 psi tensile strength required for high-vibration environments. The fine thread UNF specification with Class 3A fit ensures precise alignment and eliminates loosening in precision equipment. The 82° countersink profile allows for seamless integration into tapered recesses, making these fully threaded screws ideal for applications demanding both structural integrity and aesthetic finish requirements.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances per UNF thread standards, these screws meet ASME B18.3 and ASTM F835 specifications for dimensional accuracy and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety. The 1" length with fully threaded design provides consistent performance across the entire fastener engagement area.
