S-91253A220 8-36 x 1/2" 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 applications, reducing the risk of fastener failure.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, maintaining secure connections in dynamic environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for long-term use.
- Fully threaded design allows for maximum grip along the entire length, improving load distribution and holding power.
- 82° countersink angle and flat head enable flush mounting, minimizing protrusion for a clean, aerodynamic surface finish.
- Hex drive (3/32") facilitates easy installation and removal with standard tools, reducing assembly time and labor costs.
- Rockwell C39 hardness ensures high wear resistance and durability, extending service life in demanding industrial settings.
Professional Applications & Engineering Value
These 8-36 UNF flat head screws are engineered to address critical challenges in precision assembly and high-vibration environments. The fine thread spacing and Class 3A thread fit provide excellent resistance to loosening under dynamic loads, making them ideal for aerospace, automotive, and machinery applications where reliability is paramount. The black-oxide alloy steel construction combines high tensile strength with corrosion protection, ensuring longevity in harsh conditions. The 82° countersink angle allows for seamless integration into tapered holes, reducing stress concentrations and improving structural integrity. Fully compliant with ASTM F835, these screws deliver consistent performance for industrial fasteners requiring exacting standards.
Specification Summary & Compliance
This screw features a UNF fine thread with Class 3A precision tolerance, ensuring tight fit and reliable performance. It meets ASTM F835 specifications for mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.
