S-91737A079 4-40 x 3/8" ASME B18.6.3 Stainless Steel Fillister Head Phillips Screws
Stainless Steel Fillister Head Phillips 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 thanks to 18-8 Stainless Steel construction and passivated finish, ideal for harsh environments.
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable performance under high stress.
- Optimized drive engagement with Phillips No. 1 drive and high, narrow rounded fillister head for efficient installation and reduced cam-out.
- Maximum holding power from the fully threaded coarse UNC design, ensuring secure fastening in various materials.
- Precise thread fit with Class 2A tolerance for consistent, reliable assembly and interchangeability.
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
- Versatile 3/8" length and compact design suitable for space-constrained industrial and machine applications.
Professional Applications & Engineering Value
This 4-40 UNC Rounded Fillister Head Phillips Machine Screw is engineered to address common industrial challenges such as vibration loosening and corrosion in demanding settings. Made from 18-8 Stainless Steel with a passivated finish, it provides excellent resistance to rust and chemicals, extending service life in machinery, electronics, and automotive assemblies. The coarse thread and fully threaded design enhance grip in softer materials, while the Phillips drive ensures quick, secure installation. Its high, narrow rounded fillister head offers a low-profile solution for applications where clearance is limited, making it a reliable choice for industrial screws and precision equipment.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 2A fit for precise dimensional accuracy, ensuring consistent performance. It is manufactured in compliance with ASME B18.6.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety requirements for industrial use.
