S-90909A611 4-40 x 1/4" ASME B18.3 Stainless Steel Flanged Button Head Hex-Drive Screws
Stainless Steel Flanged Button Head Hex-Drive 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 316 stainless steel construction, ideal for harsh chemical and marine environments
- Superior holding power from 70,000 psi tensile strength for reliable performance in demanding applications
- Precise thread engagement with Class 3A fit UNC coarse threads ensuring vibration resistance and secure fastening
- Integrated flange design eliminates need for separate washers, providing wider bearing surface and simplified installation
- Enhanced drive stability with hex drive configuration preventing cam-out during high-torque applications
- Full threading capability allows maximum grip length and adjustment flexibility throughout the entire shank
- Regulatory compliance assurance meeting ASME B18.3 standards while being RoHS 3 and REACH compliant
Professional Applications & Engineering Value
These 316 stainless steel rounded head screws deliver critical performance advantages in corrosive and high-stress environments. The flanged design provides distributed load bearing that prevents surface damage and maintains seal integrity in assembled components. With UNC coarse threading and Class 3A thread fit, these fasteners offer exceptional resistance to vibration loosening while enabling rapid installation in production settings. The combination of fully threaded construction and hex drive configuration ensures maximum engagement depth and reliable torque transmission, making them ideal for industrial equipment, marine hardware, and chemical processing applications where corrosion resistance and mechanical reliability are paramount.
Specification Summary & Compliance
This 4-40 UNC screw features precise Class 3A thread fit tolerances with coarse thread spacing for optimal performance. Manufactured to ASME B18.3 specifications, the fastener maintains dimensional accuracy throughout its 1/4" length. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and material safety in global industrial supply chains.
