S-96640A261 4-40 x 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips 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 Black-Oxide 18-8 Stainless Steel construction, ideal for harsh environments and extended service life
- Exceptional tensile strength of 80,000 psi ensures reliable, high-load fastening without failure in demanding applications
- Precise Class 2A thread fit guarantees smooth installation and secure mating with nuts or tapped holes
- Fully threaded design provides maximum grip and consistent holding power along the entire screw length
- 82° countersink angle and undercut flat head delivers a flush, professional finish while minimizing material protrusion
- Phillips drive with No. 1 size offers controlled torque application and reduced risk of cam-out during installation
- Compliance with ASME B18.6.3, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations
Professional Applications & Engineering Value
These 4-40 UNC Flat Head Phillips Machine Screws are engineered to address critical industrial fastening challenges where space constraints and corrosion resistance are paramount. The Black-Oxide 18-8 Stainless Steel material provides excellent protection against oxidation and chemical exposure, making them suitable for electronics enclosures, automotive assemblies, and marine equipment. The fully threaded design and coarse UNC thread spacing enable quick installation and robust retention in thin materials or pre-tapped holes. With an 82° countersink angle and flat head profile, these screws sit flush to prevent snagging and maintain aerodynamic or aesthetic surfaces. Ideal for high-vibration environments, they ensure long-term reliability without loosening, supported by 80,000 psi tensile strength and Rockwell B80 hardness for durable performance.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 2A thread fit for standard tolerance and interchangeability. Dimensions include a 1/4" length, 0.212" head diameter, and right-hand threading. It conforms to ASME B18.6.3 for dimensional accuracy and mechanical properties, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety.
