S-91772A110 4-40 x 1/2" 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
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- High tensile strength of 70,000 psi ensures reliable fastening under significant mechanical stress
- Rockwell B70 hardness provides excellent durability and resistance to wear and deformation
- Class 2A thread fit offers consistent, reliable engagement for simplified assembly and disassembly
- Coarse UNC threading enables quick installation and reduced cross-threading risks
- Phillips No. 1 drive delivers secure torque transfer and minimizes cam-out during installation
- Pan head design combines low-profile aesthetics with effective clamping force distribution
Professional Applications & Engineering Value
These 4-40 UNC pan head screws deliver exceptional performance in demanding industrial applications where corrosion resistance and mechanical reliability are critical. The passivated 18-8 stainless steel construction provides superior protection against oxidation and chemical exposure, making them ideal for machinery, electronic enclosures, and outdoor equipment. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures these machine screws maintain clamping force under vibration and load variations. The coarse thread configuration allows for rapid assembly in production environments, while the Phillips drive offers familiar, efficient installation. These characteristics make them particularly valuable for maintenance operations and OEM applications requiring consistent, long-term fastening solutions.
Specification Summary & Compliance
These rounded head screws feature precise Class 2A thread fit tolerances and UNC coarse threading with 4-40 thread size. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
