S-91794A559 1/4"-28 x 3/4" ASME B18.6.3 Stainless Steel Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Enhanced torque transmission through the high, narrow fillister head design providing better driver engagement
• Precise thread engagement with Class 2A UNF fine threads ensuring reliable fastening in critical applications
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty use
• Full threading capability allowing complete penetration and secure fastening across the entire screw length
• Industry-standard compliance meeting ASME B18.6.3 specifications for guaranteed dimensional accuracy
• Environmental regulation adherence with RoHS 3 and REACH compliance for global manufacturing applications

Professional Applications & Engineering Value

This 18-8 stainless steel fillister head screw delivers exceptional performance in demanding industrial settings where corrosion resistance and mechanical reliability are paramount. The high, narrow rounded head profile provides superior driver engagement compared to standard flat heads, reducing cam-out incidents during installation. The UNF fine threading (1/4"-28) offers increased tensile strength and vibration resistance in precision machinery, electronic enclosures, and automotive assemblies. The passivated surface treatment enhances the natural corrosion resistance of stainless steel, making these slotted drive screws ideal for marine applications, food processing equipment, and chemical processing plants where moisture and aggressive chemicals are present. With full threading along the 3/4" length, these fasteners ensure maximum grip strength in thin materials and tight spaces.

Specification Summary & Compliance

This fillister head slotted screw features precise Class 2A thread fit with 1/4"-28 UNF fine threading and maintains dimensional accuracy per ASME B18.6.3 manufacturing standards. The fastener is fully compliant with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) requirements, ensuring environmental safety and global market acceptance. Mechanical properties include 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance in industrial fastening applications.