S-91858A845 4-40 x 3/8" 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
- Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh environments and chemical exposure
- Exceptional holding power from 70,000 psi tensile strength and Rockwell B80 hardness, ensuring reliable long-term fastening
- Maximum thread engagement due to fully threaded design, providing enhanced grip across the entire screw length
- Precise flush mounting with standard 82° countersink angle and flat head profile for seamless surface integration
- Easy installation and removal using standard slotted drive tools, reducing assembly time and tooling costs
- Wide compatibility with Class 2A thread fit and 4-40 UNC coarse threading, ensuring consistent performance in various applications
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and RoHS 3/REACH environmental standards
Professional Applications & Engineering Value
These 4-40 UNC flat head screws in 316 Stainless Steel deliver critical performance in demanding industrial settings where corrosion resistance and mechanical strength are paramount. The passivated finish significantly enhances surface durability against oxidation and chemical degradation, making them ideal for marine equipment, chemical processing plants, and food-grade machinery. The fully threaded coarse UNC design ensures rapid installation and superior vibration resistance, while the 82° countersink provides flush mounting in precision assemblies. Engineers specify these ASME B18.6.3 compliant fasteners for applications requiring reliable flat head machine screws that maintain integrity under continuous stress and environmental exposure.
Specification Summary & Compliance
This 3/8" length flat head screw features precise Class 2A thread fit tolerances with 4-40 UNC coarse threading and standard flat head profile. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for hazardous substance restrictions.
