S-90920A270 4-40 x 1/4" ASME B18.6.3 Alloy Steel Torx Flat Head Screws
Alloy Steel Torx Flat Head 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-plated steel construction, ensuring long-lasting performance in harsh industrial environments
- Enhanced torque transmission and reduced cam-out thanks to the T8 Torx drive design, providing secure installation and removal
- High tensile strength of 60,000 psi delivers reliable clamping force and structural integrity for demanding applications
- Secure flush mounting with undercut flat head and 82° countersink angle, preventing protrusion and improving aesthetic finish
- Easy and quick installation with fully threaded coarse (UNC) spacing, reducing assembly time in production lines
- Consistent thread engagement through Class 2A thread fit, ensuring precise alignment and vibration resistance
- Broad compatibility with standard UNC 4-40 components, simplifying inventory and replacement processes
Professional Applications & Engineering Value
These 4-40 UNC flat head Torx screws are engineered to address common industrial challenges such as vibration loosening, corrosion, and installation efficiency. The zinc-plated steel material provides a durable barrier against rust and wear, making them ideal for electronics assembly, machinery enclosures, and automotive components where environmental exposure is a concern. The Torx T8 drive minimizes tool slippage, allowing for higher torque application without damaging the screw head, which is critical in automated or high-volume manufacturing settings. Combined with the undercut flat head profile and coarse threading, these screws ensure a flush, secure fit that maintains integrity under dynamic loads, reducing maintenance needs and downtime.
Specification Summary & Compliance
This product adheres to Class 2A thread fit for consistent dimensional accuracy and features a fully threaded 4-40 UNC coarse spacing design. Manufactured in compliance with ASME B18.6.3 standards, it ensures reliable performance in mechanical fastening. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable and safe industrial practices.
