S-91790A108 4-40 x 3/8" ASME B18.6.3 Stainless Steel Slotted Oval Head Screws
Stainless Steel Slotted Oval 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
- High tensile strength of 80,000 psi ensures reliable load-bearing capacity and joint integrity
- Class 2A thread fit with UNC coarse threading provides easy installation and secure fastening in various materials
- Fully threaded design offers maximum grip length and uniform stress distribution
- ASME B18.6.3 compliance guarantees dimensional accuracy and interchangeability
- Rockwell B80 hardness maintains thread integrity and resists wear during repeated use
- RoHS 3 and REACH compliance ensures environmental safety and regulatory acceptance
Professional Applications & Engineering Value
These 4-40 UNC oval head slotted screws are engineered to address critical fastening challenges in industrial assemblies. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to corrosion and oxidation, making them suitable for applications in marine, chemical processing, and outdoor equipment. The oval head design with standard profile and slotted drive offers a flush finish when installed, reducing snagging risks while allowing easy manual adjustment. With coarse UNC threading and Class 2A fit, these screws ensure quick installation and reliable performance in soft metals, plastics, and wood, minimizing cross-threading and assembly time. Their fully threaded construction enhances pull-out strength, making them ideal for securing panels, electronic enclosures, and light mechanical components where vibration resistance and durability are paramount.
Specification Summary & Compliance
This screw features a 4-40 UNC thread size with Class 2A thread fit and coarse thread spacing, ensuring precise dimensional tolerances per ASME B18.6.3. It is manufactured from 18-8 stainless steel with a passivated finish, offering a tensile strength of 80,000 psi and hardness of Rockwell B80. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable and safe industrial use.
