S-90275A124 5-40 x 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, ensuring long-term reliability in harsh industrial environments
- High tensile strength of 60,000 psi provides exceptional load-bearing capacity and resistance to mechanical stress
- Rockwell B70 hardness delivers excellent durability and wear resistance for repeated assembly cycles
- Class 2A thread fit ensures smooth installation and reliable fastening with standard UNC nuts and threaded holes
- 82° countersink angle allows for flush mounting in standard countersunk holes, creating clean, professional finishes
- Fully threaded design maximizes grip length and provides consistent clamping force along the entire engagement
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality assurance and regulatory acceptance for global industrial applications
Professional Applications & Engineering Value
These 5-40 UNC flat head screws with zinc-plated steel construction address critical engineering challenges in industrial fastening. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance under vibration and dynamic loads, making them ideal for machinery, equipment assembly, and metal fabrication. The coarse UNC threads provide excellent engagement in various materials, while the 82° countersink angle and slotted drive facilitate precise installation in confined spaces. These fully threaded fasteners deliver consistent clamping force across applications from automotive components to electrical enclosures, solving common issues of loosening and material fatigue in demanding environments.
Specification Summary & Compliance
This flat head screw features precise Class 2A thread fit per UNC standards with right-hand threading and 1/4" length. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in industrial applications worldwide.
