S-90585A541 1/4"-20 x 7/8" 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 in harsh environments thanks to 316 stainless steel construction with passivated finish
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
- Precise Class 3A thread fit ensures secure fastening and reliable performance in critical assemblies
- Full UNC coarse threading provides maximum engagement and vibration resistance
- Streamlined installation with 5/32" hex drive and 82° countersink angle for flush mounting
- Regulatory compliance meets ASME B18.3 standards while being RoHS 3 and REACH compliant
- Dimensional consistency with controlled head diameter tolerance for uniform performance
Professional Applications & Engineering Value
This 316 stainless steel flat head screw delivers exceptional value in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The combination of 70,000 psi tensile strength and Rockwell B55 hardness ensures durability in high-stress applications, while the passivated finish provides enhanced protection against chemical exposure and atmospheric corrosion. The UNC coarse threading with Class 3A fit offers superior engagement in various materials, reducing the risk of stripping and maintaining joint integrity. The 82° countersink angle and hex drive design facilitate efficient installation in machinery, marine equipment, chemical processing systems, and structural assemblies where flush mounting and reliable fastening are critical operational requirements.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse threading (1/4"-20), this fastener maintains strict compliance with ASME B18.3 specifications. The screw features controlled head diameter tolerance (-0.051" to 0") and full threading along the 7/8" length. Environmental and regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, ensuring suitability for regulated industrial applications worldwide.
