S-96640A366 1/4"-20 x 1/2" 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 Black-Oxide 18-8 Stainless Steel construction, ideal for harsh industrial environments
- Exceptional tensile strength of 80,000 psi ensures reliable performance under heavy loads
- Precise Class 2A thread fit guarantees smooth installation and secure fastening in UNC coarse thread applications
- 100° countersink angle provides flush mounting with standard flat head profiles for clean, professional finishes
- Fully threaded design maximizes grip length and distributes stress evenly across the entire fastener
- Rockwell B80 hardness maintains structural integrity and prevents deformation during installation
- Compliance with ASME B18.6.3 ensures consistent quality and interchangeability in industrial assemblies
Professional Applications & Engineering Value
These 1/4"-20 UNC flat head Phillips screws deliver critical engineering solutions where corrosion resistance and structural integrity are paramount. The Black-Oxide 18-8 Stainless Steel construction provides enhanced protection against oxidation and chemical exposure, making them ideal for marine, automotive, and outdoor equipment applications. The combination of 80,000 psi tensile strength and Rockwell B80 hardness ensures these fasteners maintain clamp force under vibration and thermal cycling, while the 100° countersink angle and fully threaded design prevent material pull-through in sheet metal and plastic assemblies. The Phillips drive offers familiar installation while the coarse UNC threading provides rapid assembly in production environments.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent performance. The 1/4"-20 UNC coarse thread configuration ensures reliable engagement in various materials. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. Right-hand thread direction with standard flat head profile and No. 3 Phillips drive size for industry-standard compatibility.
