S-91794A558 1/4"-28 x 5/8" ASME B18.6.3 Stainless Steel Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish for extended service life in harsh environments
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity and joint integrity under stress
• Precision Class 2A thread fit provides smooth installation and secure fastening with minimal backlash
• Fine UNF threading (1/4"-28) offers increased thread engagement for vibration-resistant connections
• Fillister head design with high, narrow profile allows for deeper tool engagement and improved torque transmission
• Full threading along 5/8" length enables maximum adjustability and consistent clamping force
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality consistency and environmental responsibility

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 1/4"-28 UNF rounded head slotted screws deliver exceptional performance where corrosion resistance and mechanical reliability are critical. The 18-8 Stainless Steel construction combined with passivated surface treatment provides superior protection against chemical exposure and atmospheric corrosion, making them ideal for marine equipment, food processing machinery, and outdoor applications. The fine thread configuration ensures secure fastening in thin materials and vibration-prone assemblies, while the fillister head design offers improved driver engagement for precise torque application. These fully threaded screws maintain consistent clamping force across the entire 5/8" length, providing engineers with versatile fastening solutions for precision equipment, electronic enclosures, and mechanical assemblies requiring repeated disassembly.

Specification Summary & Compliance

This rounded head slotted screw features precise Class 2A thread fit according to UNF standards with 1/4"-28 fine threading and full threading along the 5/8" length. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) requirements for chemical safety, ensuring environmental responsibility and regulatory adherence for global industrial applications.