S-91253A085 2-56 x 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 conditions, reducing the risk of fastener failure
- Precision Class 3A thread fit provides superior engagement and vibration resistance in demanding applications
- Black-oxide coating on alloy steel offers enhanced corrosion protection for extended service life in harsh environments
- 82° countersink angle with flat head design enables flush mounting for clean, professional finishes
- Hex drive configuration allows for secure tool engagement and efficient installation with standard hex tools
- Full threading along the 3/4" length ensures maximum holding power throughout the entire fastener engagement
- Rockwell C39 hardness rating maintains thread integrity and prevents stripping during repeated installations
Professional Applications & Engineering Value
These 2-56 UNC flat head screws deliver critical performance advantages for precision assembly applications where space constraints and reliability are paramount. The black-oxide alloy steel construction combined with the Class 3A thread fit addresses common industrial challenges including vibration-induced loosening and corrosion in electronic enclosures, machinery components, and automotive assemblies. The coarse thread spacing and fully threaded design provide rapid installation and superior pull-out resistance in materials ranging from metals to engineered plastics. The 82° countersink angle ensures seamless integration with standard chamfered holes, eliminating protrusions in tight-clearance applications while the hex drive configuration prevents cam-out during high-torque installation.
Specification Summary & Compliance
Manufactured to exacting ASTM F835 specifications with precision Class 3A thread fit tolerances and UNC coarse thread spacing. These 3/4" fully threaded screws feature right-hand threading with 0.050" hex drive compatibility. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use across global markets.
