S-91263A567 1/4"-20 x 2 1/4" 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, extending service life in harsh industrial environments
- Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads and vibration
- Precise Class 3A thread fit provides secure, vibration-resistant connections with minimal risk of loosening
- 82° countersink angle with standard flat head profile delivers flush mounting for clean, professional finishes
- Partially threaded UNC coarse spacing design allows for faster installation and improved clamping force in various materials
- Hex drive (5/32") compatibility enables easy installation with standard tools, reducing assembly time
- Full regulatory compliance including ASTM F835, RoHS 3, and REACH ensures safety and environmental responsibility
Professional Applications & Engineering Value
These 1/4"-20 flat head screws with zinc-plated alloy steel construction address critical industrial fastening challenges where corrosion resistance and high strength are paramount. The UNC coarse thread configuration provides excellent grip in metal, wood, and composite materials, while the partial threading design prevents material splitting and ensures optimal clamp load distribution. With Rockwell C39 hardness and 130,000 psi tensile strength, these hex drive screws maintain integrity in high-stress applications including machinery assembly, structural frameworks, and heavy equipment manufacturing. The 82° countersink angle creates seamless surface finishes, making them ideal for applications requiring both structural integrity and aesthetic considerations.
Specification Summary & Compliance
Manufactured to precise Class 3A thread fit tolerances with UNC coarse thread spacing (1/4"-20). These 2 1/4" length screws feature partial threading with minimum 1" thread length and standard 82° countersink angle. Fully compliant with ASTM F835 manufacturing specifications, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) regulations for chemical safety.
