S-91253A126 5-40 x 3/8" 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 durability with Black-Oxide Alloy Steel construction providing superior corrosion resistance and extended service life
- Maximum load-bearing capability thanks to 130,000 psi tensile strength and Rockwell C39 hardness for demanding applications
- Precise thread engagement with Class 3A thread fit ensuring reliable fastening and vibration resistance
- Easy installation and removal with hex drive design providing superior torque transmission and tool accessibility
- Optimal flush mounting with standard 82° countersink angle for seamless surface integration
- Full threading coverage along the 3/8" length for maximum grip strength and uniform stress distribution
- Regulatory compliance assurance meeting industry standards including RoHS 3 and REACH for safe usage
Professional Applications & Engineering Value
These 5-40 UNC flat head screws with Black-Oxide Alloy Steel construction deliver critical performance advantages in industrial settings where reliability is paramount. The Class 3A thread fit and coarse threading provide exceptional resistance to vibration loosening, making them ideal for machinery, equipment assembly, and automotive applications. The hex drive configuration enables high-torque installation without cam-out risks, while the 82° countersink ensures flush mounting in precision components. With fully threaded design and 130,000 psi tensile strength, these screws maintain structural integrity under extreme loads, solving common failure points in heavy-duty industrial fastening systems.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and UNC coarse thread specifications. Complies with ASME B18.3 and ASTM F835 manufacturing standards, ensuring dimensional accuracy and performance reliability. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements for hazardous substance restrictions. The Black-Oxide surface treatment provides enhanced corrosion protection while maintaining dimensional stability across the 3/8" length and 5-40 thread size.
