S-91781A544 1/4"-20 x 1 1/4" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws
Stainless Steel Slotted 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 18-8 Stainless Steel construction and passivated finish, ensuring long-term reliability in harsh environments
- Exceptional mechanical strength delivering 80,000 PSI tensile strength and Rockwell B80 hardness for demanding applications
- Precise flush installation with standard 82° countersink angle and flat head design for smooth, professional finishes
- Reliable coarse threading with UNC 1/4"-20 pattern and Class 2A fit for secure fastening and easy assembly
- Full-thread engagement along the 1-1/4" length provides maximum grip and load distribution
- Industry-standard compliance with ASME B18.6.3 specifications for consistent quality and performance
- Environmental responsibility through RoHS 3 and REACH compliance, meeting modern regulatory requirements
Professional Applications & Engineering Value
This 1/4"-20 UNC flat head slotted screw delivers critical engineering solutions where corrosion resistance and high tensile strength are paramount. The combination of 18-8 Stainless Steel material and passivated finish provides exceptional protection against rust and chemical degradation in industrial environments, manufacturing equipment, and outdoor applications. The coarse UNC threading ensures rapid installation and secure fastening in various materials, while the standard 82° countersink angle allows for flush mounting in precision assemblies. These fully threaded screws maintain consistent 80,000 PSI tensile strength throughout their length, making them ideal for structural components, machinery frames, and heavy-duty fixtures where vibration resistance and long-term reliability are essential.
Specification Summary & Compliance
This flat head screw features precise Class 2A thread fit with 1/4"-20 UNC coarse threading and right-hand direction. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance standards. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety standards.
