S-91263A565 1/4"-20 x 1 3/4" 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-plated alloy steel construction for extended service life in harsh industrial environments
- Exceptional tensile strength of 130,000 psi ensures reliable fastening under heavy loads and vibration
- Precision Class 3A thread fit provides consistent engagement and reduces cross-threading risks during assembly
- Optimized 82° countersink angle allows for flush mounting and clean aesthetic finish in applications
- Hex drive compatibility with 5/32" drive size enables secure tool engagement and efficient installation
- Partial threading design offers improved clamping force control in specific joint configurations
- Rockwell C39 hardness rating maintains thread integrity and prevents stripping during repeated use
Professional Applications & Engineering Value
These 1/4"-20 UNC flat head screws deliver critical engineering solutions for industrial applications where vibration resistance and structural integrity are paramount. The zinc-plated alloy steel construction provides essential corrosion protection for machinery, automotive assemblies, and outdoor equipment. The coarse thread spacing combined with Class 3A thread fit ensures rapid installation while maintaining precise tolerance control. The partially threaded design allows for optimal clamp load distribution in metal-to-metal fastening applications, while the 82° countersink angle creates seamless flush mounting in precision assemblies. These hex drive screws are engineered to withstand demanding conditions where 130,000 psi tensile strength is required for long-term reliability.
Specification Summary & Compliance
This flat head screw features 1/4"-20 UNC coarse threads with Class 3A thread fit precision and partial threading with minimum 1" thread length. Manufactured to meet ASTM F835 specifications with Rockwell C39 hardness and 130,000 psi tensile strength. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.
