S-90585A043 1/4"-20 x 2 1/4" 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
- Exceptional corrosion resistance in harsh environments due to 316 stainless steel construction with passivated finish
- Superior load-bearing capability with 70,000 psi tensile strength for demanding industrial applications
- Precise Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
- Optimal flush mounting with standard 82° countersink angle for smooth surface finishes
- Enhanced installation efficiency through hex drive design requiring only 5/32" tooling
- Full-thread engagement along the 2-1/4" length provides maximum holding power
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards
Professional Applications & Engineering Value
These 1/4"-20 UNC flat head screws deliver critical performance advantages in corrosive and high-stress environments. The 316 stainless steel material combined with passivated finish provides exceptional resistance to chemicals, saltwater, and industrial atmospheres, making them ideal for marine equipment, chemical processing plants, and food processing machinery. The Class 3A thread fit and coarse UNC threading ensure rapid assembly with minimal cross-threading risk, while the flat head design with standard 82° countersink creates seamless surface transitions. With full threading along the entire 2-1/4" length, these hex drive screws distribute clamping force evenly, preventing joint failure in vibration-prone applications. The combination of 70,000 psi tensile strength and Rockwell B55 hardness ensures reliable performance in structural fastening and heavy-duty industrial equipment.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit tolerance and UNC coarse thread profile. Compliant with ASME B18.3 specification for socket cap screws, ensuring interchangeability and reliability. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features include: 1/4"-20 thread size, 2-1/4" length, 5/32" hex drive, 0.531" head diameter, and 82° countersink angle.
