S-91253A599 5/16"-18 x 3 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 demanding industrial applications
- Superior thread precision with Class 3A fit provides secure fastening and vibration resistance
- Black-oxide surface treatment on alloy steel offers enhanced corrosion resistance for extended service life
- Rockwell C39 hardness rating delivers excellent wear resistance and durability under heavy loads
- 82° countersink angle with standard flat head profile enables flush mounting and clean aesthetic finish
- Hex drive design with 3/16" drive size allows for high-torque installation and easy removal
- Partial threading configuration provides optimal grip strength while minimizing material stress
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws are engineered to address critical fastening challenges in industrial applications where vibration resistance and structural integrity are paramount. The black-oxide alloy steel construction combined with Class 3A thread fit ensures precise engagement and maintains clamping force in high-stress environments. The partially threaded design with coarse UNC threading provides superior holding power in various materials while the 82° countersink angle creates seamless surface integration. These hex drive screws are particularly valuable in machinery assembly, structural frameworks, and heavy equipment where 130,000 psi tensile strength and Rockwell C39 hardness prevent fastener failure under extreme operational conditions.
Specification Summary & Compliance
Manufactured to exacting ASTM F835 standards with precision Class 3A thread fit and UNC coarse thread specifications. These 3 1/2" flat head screws feature 5/16"-18 thread size with minimum thread length of 1 1/8". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors while meeting international quality and safety requirements.
