S-91500A544 1/4"-20 x 1 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips 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 316 Stainless Steel construction and passivated finish, ideal for harsh industrial environments
- High mechanical strength delivering 70,000 psi tensile strength and Rockwell B80 hardness for reliable, long-lasting fastening
- Precise Class 2A thread fit ensures smooth installation and secure engagement in coarse-threaded UNC applications
- Full threading design provides maximum grip and load distribution across the entire fastener length
- Standard 82° countersink angle allows for flush mounting and clean aesthetic finish in assembled products
- Phillips No. 3 drive offers familiar, efficient installation with reduced cam-out risk during torque application
- Compliance with ASME B18.6.3 and environmental standards (RoHS 3, REACH) ensures quality and regulatory acceptance
Professional Applications & Engineering Value
These 1/4"-20 UNC flat head screws in 316 Stainless Steel with a passivated finish are engineered to address critical challenges in industrial settings where corrosion resistance and structural integrity are paramount. The combination of 70,000 psi tensile strength and Rockwell B80 hardness ensures dependable performance under stress, while the fully threaded coarse UNC design facilitates quick assembly and vibration resistance. Ideal for machinery, marine equipment, chemical processing, and outdoor infrastructure, these screws prevent fastener failure in aggressive environments. The flat head with standard profile and 82° countersink provides a seamless finish, reducing snag hazards and maintaining aerodynamic or aesthetic surfaces in assembled products.
Specification Summary & Compliance
This product adheres to Class 2A thread fit tolerances per UNC standards, ensuring dimensional accuracy and interchangeability. Manufacturing and quality are governed by ASME B18.6.3 specifications. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting environmentally responsible procurement.
