S-90275A135 5-40 x 1 1/4" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted 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, extending service life in demanding industrial environments.
- High tensile strength of 60,000 psi ensures reliable, secure fastening under significant mechanical stress.
- Rockwell B70 hardness provides excellent durability and resistance to wear and deformation.
- Class 2A thread fit offers consistent, easy assembly and interchangeability with standard nuts and tapped holes.
- 82° countersink angle and flat head design allows for a flush, clean finish, ideal for applications where a smooth surface is critical.
- Fully threaded right-hand design with coarse UNC spacing enables quick installation and strong holding power.
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees product quality, safety, and environmental responsibility for global supply chains.
Professional Applications & Engineering Value
This 5-40 UNC flat head screw is engineered from zinc-plated steel to solve common industrial challenges like corrosion and joint failure. Its fully threaded coarse UNC thread and Class 2A thread fit ensure rapid, precise installation in machinery, automotive assemblies, and electronic enclosures, reducing assembly time and improving reliability. The 82° countersink angle and flat head profile provide a seamless finish, preventing snagging and maintaining aerodynamic or aesthetic surfaces. With a 60,000 psi tensile strength and Rockwell B70 hardness, it withstands high vibration and load, making it a trusted heavy-duty fastener for critical applications where performance cannot be compromised.
Specification Summary & Compliance
This screw features a 5-40 UNC thread size with Class 2A thread fit for standard dimensional accuracy and coarse thread spacing. It is manufactured in compliance with ASME B18.6.3 specifications, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.
