S-91771A540 1/4"-20 x 3/4" 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 passivated 18-8 stainless steel construction, ideal for harsh industrial environments.
- Exceptional tensile strength of 80,000 PSI and Rockwell B80 hardness for reliable performance under high-stress applications.
- Precise Class 2A thread fit ensures easy assembly and secure fastening with UNC coarse threading.
- Standard 82° countersink angle allows for a flush, professional finish in countersunk holes.
- Phillips No. 3 drive design provides efficient torque transfer and reduces cam-out during installation.
- Full threading along the 3/4" length offers maximum grip and adjustability in various material thicknesses.
- Compliance with major industry standards including ASME B18.6.3, RoHS 3, and REACH for guaranteed safety and reliability.
Professional Applications & Engineering Value
This 1/4"-20 x 3/4" flat head Phillips machine screw is engineered to address common industrial challenges such as vibration loosening and environmental degradation. Made from passivated 18-8 stainless steel, it provides excellent resistance to rust and corrosion, making it suitable for outdoor equipment, marine hardware, and chemical processing facilities. The UNC coarse threading and Class 2A fit ensure quick installation and reliable holding power in metals, plastics, and composites, reducing assembly time and maintenance costs. The flat head with an 82° countersink angle sits flush to prevent snagging and improve aesthetics in finished products. Ideal for machinery, automotive assemblies, and structural frameworks, this screw delivers consistent performance where high tensile strength and durability are critical.
Specification Summary & Compliance
This screw features precise Class 2A thread fit and UNC coarse threading (1/4"-20) with a length of 3/4". It is manufactured in accordance with ASME B18.6.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.
