S-92949A833 1/4"-20 x 7/16" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive 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 18-8 stainless steel construction and passivated finish, ideal for harsh 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 backlash in demanding applications
- Optimized hex drive design (5/32") provides superior torque transmission and reduces tool slippage
- Full threading coverage delivers consistent clamping force across the entire fastener length
- Standardized UNC coarse threads (1/4"-20) enable quick installation and compatibility with common components
- Rounded button head profile combines low-profile aesthetics with practical clearance requirements
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these 18-8 stainless steel rounded head screws address critical challenges in machinery assembly, structural frameworks, and corrosion-prone environments. The combination of 70,000 psi tensile strength and Class 3A UNC coarse threads ensures vibration-resistant connections that maintain integrity under dynamic loads. The passivated finish significantly enhances corrosion resistance beyond standard stainless steel, making these hex drive screws ideal for chemical processing equipment, marine hardware, and outdoor installations where environmental factors degrade ordinary fasteners. The rounded head design with 5/32" hex drive facilitates installation in confined spaces while providing sufficient torque capacity for high-stress joints.
Specification Summary & Compliance
This 1/4"-20 UNC threaded screw maintains Class 3A thread tolerances for precision fit and meets ASME B18.3 dimensional specifications. Manufacturing complies with ASTM F879 material standards, while environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. The 7/16" length and fully threaded configuration ensure consistent performance across standardized applications.
