S-91781A548 1/4"-20 x 1 3/4" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength delivering 80,000 psi tensile strength and Rockwell B80 hardness for demanding industrial applications
• Reliable thread engagement through fully threaded UNC coarse threads with Class 2A fit for secure fastening and vibration resistance
• Streamlined installation with standard 82° countersink angle allowing flush mounting and reduced assembly time
• Broad compliance coverage meeting ASME B18.6.3 specifications plus RoHS 3 and REACH environmental regulations
• Versatile drive compatibility featuring slotted drive style for universal tool access across maintenance and production environments
• Precision dimensional control with standardized flat head profile ensuring consistent performance and interchangeability

Professional Applications & Engineering Value

These 18-8 Stainless Steel flat head screws address critical challenges in industrial fastening where corrosion resistance and structural integrity are paramount. The combination of passivated finish and 80,000 psi tensile strength makes them ideal for automotive assemblies, construction frameworks, and machinery exposed to moisture, chemicals, or outdoor elements. The UNC coarse threading provides excellent grip in various materials while the 82° countersink creates seamless surface transitions. Engineers specify these ASME B18.6.3 compliant fasteners for applications requiring reliable performance under stress, thermal cycling, and corrosive conditions, reducing maintenance frequency and total cost of ownership.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread spacing (1/4"-20). Fully compliant with ASME B18.6.3 manufacturing specifications. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Right-hand thread direction with standard flat head profile ensures compatibility with industry-standard installation tools and procedures.