S-90275A592 5/16"-18 x 2 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 plating for extended service life in demanding industrial 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
- Class 2A thread fit offers optimal assembly clearance while maintaining secure connections
- 82° countersink angle enables flush mounting for clean, professional finishes in various applications
- Coarse UNC threading facilitates quick installation and reduces cross-threading risks
- Full threading along 2-1/4" length maximizes grip strength and adjustment flexibility
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws deliver exceptional engineering value through their zinc-plated steel construction and precision manufacturing. The combination of 60,000 psi tensile strength and Rockwell B70 hardness addresses critical industrial requirements for fasteners that withstand vibration, heavy loads, and repeated stress cycles. The standard 82° countersink angle and slotted drive style provide reliable flush mounting capabilities for machinery, equipment assembly, and structural applications where protrusion-free surfaces are essential. The coarse UNC thread pattern ensures rapid installation in various materials while maintaining the integrity of threaded connections, making these fully threaded screws ideal for manufacturing, construction, and maintenance operations where time efficiency and reliability are paramount.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances for consistent performance. Features 5/16"-18 UNC coarse threads with right-hand direction and standard flat head profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors. The 2-1/4" length with full threading provides versatile fastening solutions while maintaining dimensional accuracy throughout production.
