S-91355A091 3/8"-16 x 1 1/4" ASME B18.3, ASTM F835 Steel Flanged Button Head Hex-Drive Screws
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
- Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
- Exceptional mechanical strength from alloy steel, offering 120,000 psi tensile strength for heavy-duty applications.
- Precise, reliable fastening ensured by Class 3A thread fit, minimizing the risk of loosening under vibration.
- Integrated flange design eliminates the need for separate washers, speeding up assembly and reducing part count.
- Easy installation and removal with 7/32" hex drive, providing secure tool engagement and reducing slippage.
- Wide-rounded button head delivers a low-profile, finished appearance while distributing clamping force evenly.
- Full threading along the entire length ensures consistent grip and holding power across the entire fastener.
Professional Applications & Engineering Value
Engineered for demanding industrial assemblies, these flanged button head screws in black-oxide alloy steel address critical challenges like vibration-induced loosening and corrosion. The 3/8"-16 UNC coarse thread and Class 3A fit provide rapid installation and high clamping force, ideal for machinery, automotive frames, and structural components where reliability is non-negotiable. The integrated flange acts as a built-in washer, increasing bearing surface and preventing surface damage, while the Rockwell C39 hardness ensures the screw maintains integrity under repetitive stress. This combination of durable materials and precision thread form makes it a go-to solution for engineers seeking to enhance assembly longevity and reduce maintenance cycles in heavy-duty environments.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for precise dimensional accuracy and UNC coarse thread specifications. It is manufactured in compliance with ASME B18.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.
