S-90910A120 4-40 x 3/16" ASME B18.3, ASTM F835 Steel Button Head Torx Plus Screws
Steel Button Head Torx Plus 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 zinc plating, extending service life in harsh industrial environments.
- High-torque drive performance using Torx Plus IP8, reducing cam-out and tool wear for efficient assembly.
- Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for reliable load-bearing applications.
- Precise thread engagement with Class 3A fit and coarse UNC threading, ensuring secure fastening and vibration resistance.
- Fully threaded design for maximum grip and holding power along the entire 3/16" length.
- Low-profile rounded button head provides a finished appearance and reduces snagging in tight spaces.
- Compliance with major industry standards including ASME B18.3, guaranteeing consistent quality and interchangeability.
Professional Applications & Engineering Value
Engineered for demanding industrial fastening applications, this 4-40 UNC screw in zinc-plated alloy steel addresses critical challenges like vibration loosening and corrosion. The Torx Plus IP8 drive system enables higher torque application with minimal slippage, reducing assembly time and tool damage in automated or high-volume production lines. Its Class 3A thread fit and coarse thread spacing provide excellent resistance to dynamic loads, making it ideal for machinery, electronics, and automotive components where reliability is paramount. The combination of 120,000 psi tensile strength and Rockwell C39 hardness ensures durability under stress, while the fully threaded design offers uniform clamping force.
Specification Summary & Compliance
This fastener features a 4-40 UNC thread with Class 3A fit and coarse spacing, manufactured to precise dimensional standards. It complies with ASME B18.3 specifications for consistent performance and is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental and safety standards are met for global industrial use.
