S-90585A053 5/16"-18 x 3/8" 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 for extended service life in harsh environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under heavy loads
- Precision Class 3A thread fit ensures secure fastening and vibration resistance in demanding applications
- Optimized drive engagement with hex drive design providing superior torque transmission and reduced cam-out risk
- Full threading with UNC coarse spacing delivers maximum holding power and faster installation in various materials
- Standard 82° countersink angle allows for flush mounting and clean aesthetic finish in precision assemblies
- Comprehensive regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial applications
Professional Applications & Engineering Value
These 316 stainless steel flat head screws provide critical corrosion resistance where exposure to chemicals, moisture, or saltwater would compromise ordinary fasteners. The fully threaded UNC coarse spacing design ensures maximum thread engagement in both metallic and composite materials, while the Class 3A thread fit maintains precise tolerances for vibration-resistant assemblies. The hex drive configuration prevents stripping during high-torque installation, making these screws ideal for machinery, marine equipment, chemical processing systems, and outdoor infrastructure where reliability is paramount. The passivated finish further enhances surface durability without compromising the material's inherent corrosion-resistant properties.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit for precision assembly. Features 5/16"-18 UNC coarse threads with right-hand direction and standard 82° flat head profile. Dimensions include 3/8" length, 0.656" head diameter, and 3/16" hex drive size. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures suitability for global industrial markets.
