S-91781A576 1/4"-20 x 5" 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
- Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments
- High tensile strength of 80,000 psi ensures reliable performance in demanding mechanical applications
- Precise Class 2A thread fit provides smooth assembly and secure fastening with UNC coarse threading
- Standard 82° countersink angle allows for flush mounting and clean aesthetic finish
- Partially threaded design offers optimal grip strength while reducing installation torque requirements
- Rockwell B80 hardness maintains structural integrity under repeated stress and vibration
- Full compliance with ASME B18.6.3 guarantees dimensional accuracy and interchangeability
Professional Applications & Engineering Value
This 1/4"-20 UNC flat head screw delivers critical engineering solutions where corrosion resistance and structural integrity are paramount. The combination of 18-8 stainless steel material and passivated finish provides superior protection against chemical exposure and atmospheric corrosion, making it ideal for marine equipment, food processing machinery, and outdoor industrial applications. The partially threaded configuration ensures maximum clamping force where needed while minimizing thread damage during installation. With its standard 82° countersink angle and slotted drive style, this heavy-duty fastener enables precise flush mounting in machinery, structural frameworks, and equipment assemblies where vibration resistance and long-term reliability are essential.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent performance. Features UNC coarse threading (1/4"-20) with minimum 1-1/2" thread length and standard 82° countersink angle. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
