S-90910A816 4-40 x 1/2" 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
- Exceptional corrosion resistance with zinc plating, extending service life in harsh industrial environments
- Superior torque transmission and reduced cam-out with the Torx Plus IP8 drive, enabling precise installation and higher applied force
- High-reliability fastening from a 120,000 psi tensile strength and Rockwell C39 hardness, preventing failure under heavy loads
- Secure, vibration-resistant connections ensured by the Class 3A thread fit and coarse UNC threading for quick assembly
- Streamlined, low-profile design of the rounded button head minimizes snagging and provides a finished appearance
- Guaranteed dimensional consistency and performance, manufactured to meet ASME B18.3 specifications
- Safe for regulated industries, fully compliant with RoHS 3 and REACH environmental standards
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated alloy steel screws are engineered to solve critical fastening challenges in demanding applications. The Torx Plus drive (IP8) delivers maximum torque transfer, eliminating tool slippage and head stripping during high-stress assembly in electronics, machinery, and automotive subsystems. The fully threaded design with a Class 3A fit ensures consistent clamping force and vibration resistance, while the rounded button head offers a flush finish that reduces clearance issues. Made from high-strength alloy steel, they withstand extreme mechanical stresses up to 120,000 psi, providing long-term reliability in OEM manufacturing and MRO operations where coarse thread spacing facilitates rapid installation.
Specification Summary & Compliance
This product adheres to a Class 3A thread fit for high-precision assemblies and is manufactured according to the ASME B18.3 standard (ASTM F835). The UNC coarse thread with right-hand direction is fully threaded on a 1/2" length. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) is confirmed, ensuring the screws are free of hazardous substances for safe use in global markets.
