S-91771A563 1/4"-28 x 1 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments
- Exceptional mechanical strength with 80,000 PSI tensile strength and Rockwell B80 hardness for demanding applications
- Precise thread engagement with Class 2A UNF fine threads providing secure, vibration-resistant fastening
- Optimized flush installation featuring standard 82° countersink angle and flat head design for smooth surface finishing
- Enhanced driving efficiency with Phillips No. 3 drive style for reliable torque transmission and installation control
- Full thread coverage across the entire 1-1/4" length for maximum grip and load distribution
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 1/4"-28 UNF flat head Phillips screws deliver critical performance advantages for industrial applications where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making these flat head screws ideal for machinery, marine equipment, and food processing applications. The UNF fine thread configuration ensures superior vibration resistance and precise clamping force distribution, while the 82° countersink angle enables seamless flush mounting in precision assemblies. With 80,000 PSI tensile strength, these fully threaded screws maintain structural integrity under heavy loads, solving common failure points in demanding industrial environments.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerance for precision assembly. Features 1/4"-28 UNF fine threads with right-hand orientation and standard flat head profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include Rockwell B80 hardness and 80,000 PSI tensile strength, ensuring reliable performance in industrial fastening applications.
