S-90275A581 5/16"-18 x 3/4" 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 for extended service life in demanding environments
- Exceptional load-bearing capacity with 60,000 psi tensile strength and Rockwell B70 hardness for reliable performance under stress
- Precise flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
- Quick installation and removal through slotted drive style and coarse UNC threading for efficient assembly operations
- Consistent thread engagement with Class 2A thread fit and full threading for uniform clamping force distribution
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and international environmental standards
- Right-hand thread design for standard industrial applications and compatibility with common installation tools
Professional Applications & Engineering Value
These zinc-plated steel flat head screws deliver critical performance in industrial applications where surface flushness and corrosion resistance are paramount. The 5/16"-18 UNC coarse thread configuration ensures rapid installation in wood, metal, and composite materials, while the 82° countersink angle provides optimal seating in standard chamfered holes. Engineered with 60,000 psi tensile strength and Rockwell B70 hardness, these fully threaded fasteners maintain structural integrity in vibration-prone environments. The slotted drive style offers compatibility with both manual and automated installation equipment, making them ideal for assembly lines, machinery manufacturing, and structural applications requiring reliable, flush-mounted fastening solutions.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances for consistent performance. The UNC coarse thread (5/16"-18) provides optimal engagement in various materials. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. Standard 82° countersink angle and right-hand thread direction conform to industrial norms for compatibility and interchangeability.
