S-90273A593 5/16"-18 x 2 1/2" 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
- High tensile strength of 60,000 psi ensures reliable fastening under substantial mechanical loads
- Rockwell B70 hardness provides excellent durability and resistance to wear during installation and use
- Standard 82° countersink angle allows for clean, flush mounting in various materials
- Class 2A thread fit ensures smooth assembly and consistent performance in UNC coarse thread applications
- Partially threaded design offers optimal grip and clamping force for specific joint requirements
- Phillips No. 4 drive enables efficient installation with common tools while minimizing cam-out risks
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws are engineered to address critical fastening challenges in industrial assembly and machinery applications. The zinc-plated steel construction provides essential corrosion protection for equipment exposed to moisture or harsh operating conditions. The coarse UNC thread profile ensures rapid installation and superior holding power in materials where fine threads might strip or fail. With partial threading and standardized 82° countersink, these screws deliver precise clamping force distribution while maintaining flush surface finishes. The combination of 60,000 psi tensile strength and Rockwell B70 hardness makes them ideal for structural applications requiring repeated disassembly and reassembly without performance degradation.
Specification Summary & Compliance
This flat head screw features precise Class 2A thread fit tolerance for consistent engagement and meets ASME B18.6.3 manufacturing specifications. The product maintains dimensional accuracy with 5/16"-18 UNC coarse threads and 2-1/2" length. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety standards are met for industrial procurement.
