S-91500A546 1/4"-20 x 1 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• Maximum holding power from 70,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Enhanced durability through passivated surface finish that increases corrosion protection and extends service life
• Precise flush installation with standard 82° countersink angle and flat head design for smooth, secure surface mounting
• Quick assembly efficiency with Phillips No. 3 drive that provides excellent torque transfer and prevents cam-out
• Broad compatibility with UNC coarse 1/4"-20 threading (Class 2A fit) ensuring reliable engagement with standard components
• Full thread coverage along the entire 1½" length for maximum grip strength and uniform stress distribution

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver exceptional performance in demanding industrial applications where corrosion resistance and structural integrity are paramount. The combination of marine-grade 316 stainless steel and passivated finish provides superior protection against chloride-induced stress corrosion cracking, making them ideal for chemical processing equipment, marine hardware, and food processing machinery. The fully threaded UNC coarse pattern ensures rapid installation and secure fastening in soft materials and sheet metal applications. With their 82° countersink angle and flat head profile, these Phillips drive screws create flush surfaces that prevent snagging while maintaining aesthetic appeal in visible applications. The Class 2A thread fit guarantees consistent performance across high-vibration environments, reducing maintenance requirements and downtime in industrial assembly operations.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread tolerance for precision fit and reliable performance. These 1/4"-20 UNC coarse thread screws feature complete compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use across regulated industries. The mechanical properties include Rockwell B80 hardness and 70,000 psi tensile strength with standard 82° countersink angle for proper flush mounting in accordance with industrial fastening requirements.