S-92210A571 1/4"-28 x 7/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength delivering 70,000 PSI tensile strength and Rockwell B55 hardness for heavy-duty applications
• Precise Class 3A thread fit ensuring reliable, vibration-resistant connections in critical assemblies
• Optimal flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced installation efficiency through hex drive design providing superior torque transmission and slip resistance
• Full threading coverage along the 7/8" length for maximum grip strength and load distribution
• Regulatory compliance assurance meeting ASME B18.3 standards while being RoHS 3 and REACH compliant

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 1/4"-28 UNF flat head screws provide critical solutions where corrosion resistance and high tensile strength are paramount. The combination of 18-8 stainless steel material and passivated finish creates a robust barrier against chemical exposure and environmental degradation, making them ideal for marine equipment, food processing machinery, and outdoor structures. The Class 3A thread fit with fine thread spacing delivers superior vibration resistance in dynamic load conditions, while the 82° countersink angle ensures flush mounting in precision assemblies. The hex drive design allows for high-torque installation without cam-out, reducing assembly time and improving workplace safety in manufacturing and maintenance operations.

Specification Summary & Compliance

These flat head screws feature precision Class 3A thread fit according to UNF standards with 1/4"-28 thread size and fine thread spacing. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. The components are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors without hazardous substance restrictions.