S-91781A128 5-40 x 1/2" 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.
- Exceptional mechanical strength offering 80,000 psi tensile strength and Rockwell B80 hardness for reliable, long-term fastening.
- Precise and secure thread engagement with Class 2A thread fit and coarse UNC threading, ensuring easy assembly and vibration resistance.
- Flush mounting capability due to the standard flat head profile and 82° countersink angle, providing a smooth surface finish.
- Broad regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for safe, quality-assured industrial use.
- Versatile right-hand coarse threading (5-40 UNC) enables quick installation and high load distribution in various materials.
- Fully threaded 1/2" length maximizes grip range and holding power across different application thicknesses.
Professional Applications & Engineering Value
These 5-40 UNC flat head slotted screws in 18-8 stainless steel are engineered to address critical industrial challenges, such as corrosion in humid or chemical-exposed settings. The passivated finish enhances surface durability, preventing rust and extending service life in machinery, electronics, and automotive assemblies. With a coarse thread spacing and Class 2A thread fit, they provide rapid installation and secure fastening, reducing the risk of loosening under dynamic loads. Ideal for applications requiring flush mounting—like enclosures or panels—the flat head design and standard profile ensure a seamless fit, while high tensile strength supports structural integrity in demanding environments.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including Class 2A thread fit and UNC coarse threading (5-40 size), ensuring consistent performance and interchangeability. Manufactured in compliance with ASME B18.6.3 specifications, it guarantees mechanical reliability. Additionally, the screws are RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming they are free of hazardous substances and safe for various industrial and consumer applications.
