S-91253A595 5/16"-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 tensile strength of 130,000 psi ensures reliable performance in high-stress industrial environments
- Class 3A thread fit provides superior precision and secure fastening with minimal play
- Black-oxide coating on alloy steel offers enhanced corrosion resistance for extended service life
- 82° countersink angle enables flush mounting and clean aesthetic finish in assembled products
- Hex drive design allows for high-torque installation and removal with standard tools
- Rockwell C39 hardness maintains thread integrity and prevents stripping during repeated use
- Partial threading provides optimal grip strength while reducing material weight
Professional Applications & Engineering Value
These 5/16-18 UNC flat head screws deliver critical engineering solutions for industrial assembly challenges. The black-oxide alloy steel construction combines high tensile strength with corrosion protection, making them ideal for machinery, equipment manufacturing, and structural applications where vibration resistance is paramount. The coarse UNC threading ensures rapid installation and superior holding power in various materials, while the standard 82° countersink angle creates seamless flush mounting in precision applications. The hex drive system accommodates high torque requirements without cam-out, reducing installation time and improving workplace efficiency. These partially threaded fasteners provide optimal clamp load distribution, preventing joint loosening in dynamic load conditions common in industrial settings.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances with UNC coarse threading (5/16"-18) and right-hand thread direction. These flat head screws comply with ASTM F835 specifications for mechanical properties and dimensional requirements. The products are certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental regulatory adherence for global industrial applications.
