S-91771A175 1-72 x 1" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for demanding applications
• Precise thread engagement through Class 2A UNF fine threads, providing secure fastening with reduced risk of cross-threading
• Optimized flush mounting with standard flat head profile and 82° countersink angle for seamless surface integration
• Efficient installation using Phillips No. 0 drive system, enabling quick assembly while minimizing cam-out
• Full threading coverage across the 1" length ensures maximum grip strength and load distribution
• Regulatory compliance meets ASME B18.6.3 specifications and environmental standards for global industrial use

Professional Applications & Engineering Value

These 1-72 UNF flat head screws deliver critical performance advantages in precision engineering applications where material integrity and dimensional accuracy are paramount. The passivated 18-8 stainless steel construction provides exceptional resistance to oxidation and chemical exposure, making these flat head screws ideal for electronics enclosures, aerospace components, and marine equipment. The UNF fine thread configuration ensures superior vibration resistance compared to coarse threads, while the Class 2A thread fit guarantees consistent engagement without binding. The combination of 80,000 psi tensile strength and fully threaded design creates reliable joints in thin-section materials where pull-out strength is critical. The 82° countersink angle and Phillips No. 0 drive work synergistically to create flush-mounted assemblies with efficient installation in space-constrained industrial environments.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit tolerance and UNF (Unified National Fine) thread form specification. Complies with ASME B18.6.3 mechanical and dimensional requirements for slotted and phillips flat head screws. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) compliance for chemical safety. Thread specification: 1-72 UNF right-hand thread with fine pitch spacing, fully threaded along the 1" length with standard flat head profile.