S-99117A890 1/4"-20 x 8" ASME B18.6.3 Steel Pan Head Phillips Screws
Steel Pan Head Phillips 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 zinc-plated steel construction for extended service life in harsh environments
- Exceptional mechanical strength delivering 60,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
- Optimized torque transfer through No. 3 Phillips drive design, reducing cam-out and installation time
- Reliable coarse threading (UNC 1/4"-20) with Class 2A fit ensures secure fastening and vibration resistance
- Versatile partial threading provides superior clamping force across the 8-inch length for structural connections
- Industry-standard compliance with ASME B18.6.3 specifications for consistent quality and interchangeability
- Environmentally responsible manufacturing meeting RoHS 3 and REACH regulations for global supply chain compatibility
Professional Applications & Engineering Value
Engineered for demanding industrial and construction applications, these zinc-plated steel rounded head screws solve critical fastening challenges where corrosion resistance and structural integrity are paramount. The 1/4"-20 UNC coarse threading combined with Class 2A thread fit provides excellent engagement in various materials while resisting vibration-induced loosening. The pan head profile distributes clamping force evenly, while the partial threading design ensures optimal grip length for structural assemblies. These heavy-duty screws are particularly valuable in equipment manufacturing, structural framing, and machinery assembly where their 60,000 psi tensile strength and Rockwell B70 hardness prevent failure under dynamic loads and environmental stress.
Specification Summary & Compliance
This 8-inch rounded head screw features precise Class 2A thread fit with 1/4"-20 UNC coarse threading and partial threading configuration. Manufactured to ASME B18.6.3 standards for dimensional accuracy and performance reliability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
