S-90585A554 1/4"-20 x 3" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws
Stainless 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 316 stainless steel construction for extended service life in harsh environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
- Precision thread engagement with Class 3A thread fit ensuring reliable fastening and vibration resistance
- Optimized drive performance with 5/32" hex drive providing secure tool engagement and reduced stripping risk
- Enhanced surface protection through passivated finish for improved corrosion resistance and clean appearance
- Universal compatibility with 82° countersink angle and standard flat head profile for seamless flush mounting
- Full-threaded design delivering maximum grip length and load distribution across the entire fastener
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 316 stainless steel flat head screws provide critical corrosion resistance where exposure to chemicals, moisture, or salt spray would compromise ordinary fasteners. The 1/4"-20 UNC coarse threading with Class 3A thread fit ensures rapid installation and superior vibration resistance in machinery, structural assemblies, and marine equipment. The fully threaded design maximizes load distribution, while the 82° countersink angle creates seamless flush mounting in precision applications. These hex drive screws with passivated finish deliver reliable performance in chemical processing, marine hardware, food equipment, and outdoor infrastructure where durability and regulatory compliance are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit precision tolerances. Features 1/4"-20 UNC coarse threads with right-hand orientation and full threading along the 3" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 316 stainless steel construction maintains dimensional stability with head diameter tolerance of -0.051" to 0" and consistent mechanical properties including 70,000 psi tensile strength.
