S-91781A122 5-40 x 3/16" 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 18-8 stainless steel construction and passivated finish, ideal for harsh environments and long-term reliability.
- High mechanical strength offering 80,000 psi tensile strength and Rockwell B80 hardness for demanding applications and secure fastening.
- Precise thread engagement with Class 2A fit and UNC coarse threads, ensuring easy installation and reduced risk of cross-threading.
- Flush, low-profile seating due to the flat head with 82° countersink angle and undercut profile, providing a smooth surface finish.
- Broad industrial compliance meeting ASME B18.6.3 specifications, RoHS 3, and REACH standards for safe, regulated use.
- Versatile drive option with a slotted head, allowing compatibility with standard screwdrivers for straightforward manual assembly.
- Full threading along the 3/16" length maximizes grip and load distribution in thin materials or pre-tapped holes.
Professional Applications & Engineering Value
Engineered for precision and durability, these 5-40 UNC flat head screws in 18-8 stainless steel address common industrial challenges like corrosion, vibration loosening, and space constraints. The passivated finish enhances surface protection against oxidation, extending service life in moist or chemical-exposed settings. With a coarse thread and Class 2A fit, they facilitate quick assembly in metals or plastics, reducing installation time while maintaining 80,000 psi tensile strength for high-stress applications. The flat head design with an 82° countersink ensures a seamless fit in countersunk holes, ideal for machinery, electronics, and automotive components where a flush surface is critical to avoid interference and improve safety.
Specification Summary & Compliance
This screw features a 5-40 UNC thread size with Class 2A thread fit per standard inch measurements, ensuring dimensional accuracy and interchangeability. It complies with ASME B18.6.3 for mechanical and dimensional requirements, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances for safe industrial and commercial use.
