S-91773A548 1/4"-20 x 1 3/4" ASME B18.6.3 Stainless Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ideal for harsh environments
• Exceptional tensile strength of 100,000 psi ensures reliable performance in demanding heavy-duty applications
• Precise Class 2A thread fit guarantees smooth installation and secure fastening with reduced risk of cross-threading
• Phillips No. 3 drive design provides efficient torque transfer and reduced cam-out during installation
• Fully threaded UNC coarse pattern offers maximum grip and holding power across the entire fastener length
• Compliance with ASME B18.6.3, RoHS 3, and REACH standards ensures consistent quality and environmental responsibility
• Rockwell B100 hardness rating delivers excellent durability and resistance to wear over extended use

Professional Applications & Engineering Value

These 18-8 stainless steel rounded head screws are engineered to solve critical fastening challenges in industrial environments where corrosion resistance and structural integrity are paramount. The combination of fully threaded UNC coarse pattern and Class 2A thread fit ensures rapid installation and vibration resistance in machinery assembly, electrical enclosures, and structural frameworks. The passivated finish significantly enhances the natural corrosion resistance of stainless steel, making these Phillips drive screws ideal for outdoor equipment, marine applications, and chemical processing facilities where moisture and corrosive agents are present. With their 100,000 psi tensile strength and standardized dimensions per ASME B18.6.3, these heavy-duty fasteners provide engineering reliability for maintenance operations and OEM manufacturing across multiple industries.

Specification Summary & Compliance

This 1/4"-20 x 1 3/4" screw features precise Class 2A thread fit with UNC coarse threading and right-hand direction. Manufactured to ASME B18.6.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The fastener maintains dimensional accuracy with 0.25" thread diameter, 0.472" head diameter, and full threading along the 1 3/4" length.