S-90273A412 4-40 x 1/8" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel Phillips 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 for extended service life in demanding environments
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening performance
- Optimized flush mounting featuring 82° countersink angle and undercut flat head design for seamless surface integration
- Enhanced driving efficiency with Phillips No. 1 drive for secure tool engagement and reduced cam-out risk
- Precision thread compatibility with Class 2A UNC coarse threads ensuring consistent mating and vibration resistance
- Full-threaded design providing maximum grip length and load distribution across the entire fastener
- Regulatory compliance assurance meeting ASME B18.6.3 standards while being RoHS 3 and REACH compliant
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel flat head screws deliver critical engineering solutions where low-profile fastening and corrosion resistance are paramount. The undercut flat head profile combined with the 82° countersink angle ensures perfect flush mounting in precision assemblies, eliminating protrusion issues in tight spaces. The Phillips drive system provides reliable torque transmission while the coarse UNC threads offer rapid installation and superior vibration resistance in industrial equipment, electronic enclosures, and machinery components. The zinc-plated steel construction maintains integrity in humid or mildly corrosive environments, making these fully threaded screws ideal for applications requiring consistent clamping force along the entire fastener length.
Specification Summary & Compliance
These flat head screws feature precision Class 2A thread fit with UNC coarse threading (4-40 size) and maintain dimensional compliance with ASME B18.6.3 specifications. The manufacturing process ensures consistent 1/8" length tolerance and proper 82° countersink angle for optimal seating. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, confirming environmental safety standards for industrial applications worldwide.
