S-91781A172 1-72 x 3/4" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws
Stainless Steel Slotted Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh environments
- Exceptional tensile strength of 80,000 psi ensures reliable, long-lasting fastening under high-stress conditions
- Precision thread fit with Class 2A tolerance for smooth assembly and secure connections in fine-thread applications
- Full threading design provides maximum grip and uniform load distribution along the entire 3/4" length
- Rockwell B80 hardness maintains structural integrity and resists wear during repeated use
- Standard flat head profile with 82° countersink angle allows for flush mounting in precision assemblies
- Compliance with major standards including ASME B18.6.3, RoHS 3, and REACH for quality assurance and environmental safety
Professional Applications & Engineering Value
This 1-72 UNF flat head screw delivers critical performance in applications where space constraints and corrosion resistance are paramount. The 18-8 stainless steel construction, enhanced by a passivated finish, provides excellent protection against oxidation and chemical exposure, making it suitable for electronics, instrumentation, and marine environments. The fine UNF thread and Class 2A fit ensure precise engagement in tapped holes, reducing the risk of cross-threading and vibration loosening. Its fully threaded design offers consistent clamping force, while the flat head sits flush to maintain aerodynamic or aesthetic surfaces. These features address common industrial challenges such as material degradation, assembly accuracy, and long-term reliability in precision fastening systems.
Specification Summary & Compliance
This screw adheres to ASME B18.6.3 specifications, ensuring dimensional accuracy and interchangeability. Threads are manufactured to Class 2A tolerance for consistent fit, with UNF fine thread type and right-hand direction. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming it is free of restricted hazardous substances and safe for industrial use.
