S-91253A808 5/8"-11 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 for reliable performance in demanding industrial applications
- Superior corrosion resistance provided by the black-oxide finish, extending service life in harsh environments
- Precise Class 3A thread fit ensures secure fastening with minimal vibration loosening in critical assemblies
- Rockwell C37 hardness rating delivers excellent durability and resistance to wear under heavy loads
- Hex drive design allows for high torque application and easy installation with standard tools
- 82° countersink angle enables flush mounting for clean, professional finishes in various applications
- Partial threading configuration provides optimal grip strength while reducing material stress concentrations
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws are engineered to address critical challenges in heavy machinery, structural frameworks, and industrial equipment assembly. The coarse UNC thread pattern combined with Class 3A precision threading ensures rapid installation and vibration resistance in high-stress environments. The partially threaded design concentrates clamping force precisely where needed, preventing joint failure while the 82° countersink angle creates seamless surface transitions. The black-oxide surface treatment provides substantial corrosion protection without compromising dimensional integrity, making these hex drive fasteners ideal for construction equipment, agricultural machinery, and industrial automation systems where reliability and durability are paramount.
Specification Summary & Compliance
Manufactured to exacting inch system dimensions with Class 3A thread fit tolerance for superior engagement. These flat head screws comply with ASTM F835 manufacturing specifications ensuring consistent quality and performance. The products are fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental and safety standards for industrial components. Thread specifications include 5/8"-11 UNC coarse thread with minimum 2" thread length and standard 82° countersink angle profile.
