S-91500A122 4-40 x 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance thanks to 316 stainless steel construction, ideal for harsh environments and chemical exposure
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for reliable, long-lasting fastening
- Effortless installation and flush finish provided by the standard 82° countersink angle and Phillips No. 1 drive
- Broad compatibility and secure fit ensured by UNC coarse threading and Class 2A thread fit for common industrial applications
- Maximum grip and holding power from the fully threaded design along the entire 1/4" length
- Enhanced surface durability with a passivated finish that increases resistance to wear and further corrosion
- Guaranteed quality and safety through compliance with ASME B18.6.3, RoHS 3, and REACH standards
Professional Applications & Engineering Value
Engineered for demanding environments, these 4-40 UNC flat head Phillips screws in 316 stainless steel provide a critical solution where corrosion resistance and mechanical integrity are paramount. The passivated finish significantly enhances the material's innate ability to withstand corrosive agents, making these screws ideal for marine, chemical processing, and food-grade equipment. The combination of a coarse thread (UNC) and Class 2A fit ensures rapid assembly and a secure hold in a variety of substrates, reducing installation time and preventing thread stripping. The flat head with an 82° countersink allows for a smooth, flush surface, essential for applications in machinery and assemblies where protruding hardware is not an option, thereby improving both safety and aesthetics.
Specification Summary & Compliance
This product adheres to precise dimensional standards, featuring a Class 2A thread fit for consistent quality and interchangeability. It is manufactured in compliance with the ASME B18.6.3 specification for slotted and recessed head machine screws. Furthermore, this screw is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.
