S-91253A118 4-40 x 1 1/8" 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 corrosion resistance and extended service life
- Superior load-bearing capability thanks to 130,000 psi tensile strength and Rockwell C39 hardness
- Precise thread engagement with Class 3A thread fit ensuring reliable fastening in demanding applications
- Optimal flush mounting through standard flat head profile with 82° countersink angle
- Efficient installation with hex drive design allowing high torque application and secure seating
- Full threading coverage providing consistent clamping force along the entire 1-1/8" length
- Regulatory compliance meeting ASTM F835 specifications and environmental standards for industrial use
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical performance advantages in industrial assembly where vibration resistance and structural integrity are paramount. The Black-Oxide Alloy Steel construction combined with Class 3A thread fit ensures precise mating with components, eliminating play in machinery and equipment. The fully threaded design with coarse spacing provides maximum grip in various materials, while the 82° countersink angle creates seamless flush mounting for applications requiring smooth surfaces. Engineered to withstand high-stress environments, these hex drive screws maintain their mechanical properties under continuous load, making them ideal for automotive, aerospace, and heavy equipment applications where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerance with UNC coarse thread spacing and right-hand threading. Complies with ASTM F835 manufacturing specifications and maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 1-1/8" length and 4-40 thread size adhere to standardized inch measurements for consistent performance across industrial applications.
