S-90585A581 5/16"-18 x 3/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive 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 316 stainless steel construction and passivated finish, ideal for harsh chemical and marine environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under heavy loads
- Precision thread engagement through Class 3A UNC coarse threading ensures secure fastening and vibration resistance
- Optimized installation efficiency with hex drive design providing positive torque transmission and reduced cam-out risk
- Flush mounting capability with standard 82° countersink angle flat head for clean, streamlined surface finishes
- Regulatory compliance assurance meeting ASME B18.3 specifications while being RoHS 3 and REACH compliant
- Full-threaded design maximizes grip length and load distribution across the entire fastener
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 316 stainless steel flat head screws deliver exceptional performance in corrosive environments where chemical resistance is critical. The combination of 70,000 psi tensile strength and Class 3A UNC coarse threads provides reliable fastening in high-vibration settings such as marine equipment, chemical processing systems, and offshore structures. The passivated finish enhances surface durability while the hex drive ensures secure installation without stripping. These fully threaded screws with 82° countersink create flush surfaces ideal for machinery, structural assemblies, and equipment requiring both aesthetic cleanliness and maximum corrosion protection.
Specification Summary & Compliance
This 5/16"-18 UNC flat head screw features precise Class 3A thread fit with coarse thread spacing and right-hand threading. Manufacturing complies with ASME B18.3 standards for dimensional accuracy, including head diameter tolerance of -0.056" to 0". The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental and safety regulations for industrial components.
