S-91249A129 4-40 x 2" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws
Stainless Steel Pan 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
- Exceptional corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh environments and reducing maintenance costs.
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads, minimizing the risk of fastener failure.
- Rockwell B70 hardness provides superior durability and resistance to wear, extending service life in demanding applications.
- Coarse UNC threads with Class 2A fit allow for quick, easy installation and secure fastening in various materials.
- Fully threaded 2" length offers maximum grip and holding power across the entire shank for enhanced joint integrity.
- Phillips No. 1 drive facilitates efficient driving with standard tools, reducing assembly time and effort.
- Compliance with ASME B18.6.3, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations for safe, reliable use.
Professional Applications & Engineering Value
These 4-40 UNC rounded head screws are engineered to address common industrial challenges such as corrosion, vibration loosening, and high-stress conditions. The Black-Oxide 18-8 Stainless Steel construction provides excellent resistance to rust and oxidation, making them suitable for outdoor, marine, or chemical-exposed environments. The coarse thread design ensures strong engagement in soft materials or where rapid assembly is critical, while the pan head style with Phillips drive offers a low-profile, secure fit that withstands torque without stripping. Ideal for machinery, electronics, and automotive assemblies, these screws deliver consistent performance, reducing downtime and maintenance needs in heavy-duty fastening applications.
Specification Summary & Compliance
This product features precise Class 2A thread fit per UNC standards, ensuring consistent engagement and reliability. It meets ASME B18.6.3 specifications for dimensional accuracy and performance. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances for safe industrial use.
