S-90585A045 1/4"-20 x 3 1/2" 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 industrial environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
- Precise Class 3A thread fit ensures secure fastening with minimal vibration loosening in critical assemblies
- Efficient hex drive installation with 5/32" drive size providing positive torque transmission and reduced cam-out risk
- Optimal flush mounting with standard 82° countersink angle and flat head design for smooth surface finishes
- Full threading coverage across 3-1/2" length enables consistent clamping force distribution
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
This 316 stainless steel flat head screw delivers critical performance advantages in demanding applications where corrosion resistance and mechanical reliability are paramount. The combination of UNC coarse threading and Class 3A thread fit provides superior vibration resistance in machinery, marine equipment, and chemical processing systems. The hex drive design ensures secure installation in confined spaces while the passivated finish enhances surface durability against chemical exposure. With full threading along its 3-1/2" length, this fastener maintains consistent clamping force in structural assemblies, making it ideal for industrial applications requiring both strength and environmental compliance.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread tolerance for precision fit. Features 1/4"-20 UNC coarse threads with standard 82° countersink angle. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include 70,000 psi tensile strength and Rockwell B55 hardness rating.
