S-91263A501 4-40 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
- Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments
- Precise Class 3A thread fit ensures reliable engagement and reduces cross-threading risks during assembly
- High tensile strength of 130,000 psi provides exceptional load-bearing capacity for demanding applications
- Rockwell C39 hardness offers excellent wear resistance and maintains thread integrity under vibration
- 82° countersink angle with standard flat head profile enables flush mounting for streamlined surfaces
- 1/16" hex drive design allows for secure tool engagement and efficient installation
- Full threading along 3/8" length maximizes grip strength across the entire fastener engagement
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical performance advantages for industrial assembly operations. The zinc-plated alloy steel construction provides essential corrosion protection in manufacturing environments where moisture or chemicals are present. The Class 3A thread fit with coarse thread spacing ensures rapid installation while maintaining precision alignment, significantly reducing assembly time and potential damage to mating components. The combination of 130,000 psi tensile strength and Rockwell C39 hardness makes these fully threaded screws ideal for applications subject to vibration, thermal cycling, or heavy mechanical loads. The 82° countersink angle creates seamless surface integration in machinery, electronics enclosures, and structural frameworks where protrusions must be eliminated.
Specification Summary & Compliance
These flat head screws feature precise Class 3A thread fit per UNC standards with right-hand thread direction and coarse thread spacing. Manufacturing complies with ASTM F835 specifications for consistent quality and performance. The products are fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial use.
