S-92210A388 1/2"-20 x 1 1/4" 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 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
- Exceptional thread engagement and vibration resistance through Class 3A thread fit and UNF fine threading for secure, reliable fastening
- High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness to withstand heavy-duty operational stresses
- Efficient installation and flush seating with hex drive design and 82° countersink angle for streamlined assembly and clean surface profiles
- Full threading for maximum grip length ensuring consistent holding power across the entire fastener length
- Compliance with industry standards including ASME B18.3 specifications for guaranteed dimensional accuracy and performance
- Environmental regulation compliance meeting RoHS 3 and REACH requirements for safe use in regulated industries
Professional Applications & Engineering Value
This 18-8 stainless steel flat head screw with 1/2"-20 UNF fine threading delivers critical performance in demanding industrial applications. The combination of Class 3A thread fit and passivated finish addresses common challenges of vibration loosening and corrosion in machinery, automotive, and structural assemblies. The hex drive design provides superior torque transmission during installation, while the 82° countersink angle ensures flush mounting in precision components. Engineered for heavy-duty fastening where reliability is paramount, these screws maintain integrity under continuous stress thanks to their 70,000 psi tensile strength and full threading that distributes load evenly across engaged surfaces.
Specification Summary & Compliance
This fastener features precision Class 3A thread fit with 1/2"-20 UNF fine threads and right-hand direction. Manufactured to ASME B18.3 specifications ensuring dimensional accuracy for head diameter (0.938"), length (1-1/4"), and drive size (5/16"). Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.
