S-91249A618 4-40 x 1 3/4" 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 Black-Oxide coated 18-8 Stainless Steel construction, ideal for harsh industrial environments
- High tensile strength of 70,000 psi ensures reliable performance under significant mechanical stress
- Precise Class 2A thread fit provides consistent engagement and reduces cross-threading risks
- Coarse UNC threading enables faster installation and better debris resistance
- Phillips No. 1 drive design offers widespread tool compatibility and controlled torque application
- Fully threaded shank maximizes grip length and load distribution across the entire fastener
- Compliant with ASME B18.6.3 ensuring dimensional accuracy and interchangeability
Professional Applications & Engineering Value
This 4-40 UNC machine screw with Black-Oxide coated 18-8 Stainless Steel construction addresses critical needs in industrial assembly where corrosion resistance and mechanical reliability are paramount. The rounded pan head design provides a low-profile finish while the Phillips No. 1 drive ensures compatibility with standard tools, reducing installation time. With coarse threading and Class 2A thread fit, these screws maintain secure fastening in vibrating equipment, electronic enclosures, and machinery where loosening under dynamic loads is a concern. The combination of 70,000 psi tensile strength and full threading delivers superior clamping force distribution, making these fully threaded screws ideal for applications requiring consistent pressure across the entire joint length.
Specification Summary & Compliance
This machine screw features 4-40 UNC coarse threads with Class 2A thread fit tolerances, ensuring precise dimensional accuracy according to ASME B18.6.3 specifications. The fastener is manufactured from 18-8 Stainless Steel with Black-Oxide coating and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for use in regulated industries and international markets.
