S-90585A205 4-40 x 5/8" 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, ideal for harsh environments and chemical exposure
- Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
- Precision Class 3A thread fit ensures tight, secure fastening with minimal backlash in critical assemblies
- Optimized flush mounting with standard 82° countersink angle and flat head design for smooth, unobtrusive surface finishes
- Enhanced durability from passivated surface treatment that increases corrosion resistance and extends service life
- Efficient installation with hex drive (1/16") providing positive torque transmission and reduced tool slippage
- Full threading coverage along the 5/8" length ensures maximum grip and uniform stress distribution
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical performance where corrosion resistance and precision alignment are paramount. Manufactured from 316 stainless steel with a passivated finish, they withstand aggressive environments including marine, chemical processing, and food equipment applications. The coarse UNC thread and Class 3A fit provide vibration-resistant fastening while the 82° countersink ensures flush mounting in precision machined components. The hex drive design allows high-torque installation in confined spaces, making these fully threaded screws ideal for industrial machinery, electronic enclosures, and structural assemblies requiring reliable, long-term fastening solutions.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit and inch system measurements. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include: 4-40 UNC coarse thread, right-hand direction, 0.255" head diameter, and full compliance with industrial standards for dimensional accuracy and material properties.
