S-91263A205 3/8"-24 x 1 1/4" ASME B18.3 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 load-bearing capacity with 120,000 psi tensile strength and Rockwell C32 hardness for reliable performance under high stress
- Precise thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance in critical assemblies
- Efficient installation with standard 82° countersink angle allowing flush mounting and hex drive for high-torque applications
- Full threading design providing maximum grip length and uniform stress distribution along the entire fastener
- Regulatory compliance meeting ASME B18.3 standards for dimensional accuracy and RoHS/REACH for environmental safety
- Fine thread configuration (UNF 24 TPI) delivering enhanced clamping force and superior resistance to loosening
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this 3/8"-24 UNF flat head screw combines zinc-plated alloy steel construction with Class 3A thread fit to address critical fastening challenges. The fine UNF threading provides superior vibration resistance in machinery, automotive, and heavy equipment assemblies, while the 82° countersink angle ensures seamless flush mounting in precision components. With 120,000 psi tensile strength and Rockwell C32 hardness, it maintains structural integrity under extreme loads, making it ideal for high-stress applications where reliability and dimensional accuracy are paramount. The hex drive design facilitates quick installation and removal in confined spaces, enhancing maintenance efficiency.
Specification Summary & Compliance
This fastener maintains Class 3A thread fit precision with UNF fine thread specifications (24 TPI) and complies with ASME B18.3 dimensional standards. Manufacturing adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety, ensuring suitability for global industrial supply chains. The fully threaded design and 82° countersink angle meet standardized engineering requirements for consistent performance across applications.
