S-91781A539 1/4"-20 x 5/8" 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 construction and passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Precision thread engagement through UNC coarse threading and Class 2A fit, ensuring consistent fastening and vibration resistance
- Optimized flush mounting with standard flat head profile and 82° countersink angle for seamless surface integration
- Broad compliance coverage meeting ASME B18.6.3 specifications plus RoHS 3 and REACH environmental regulations
- Full-threaded design providing maximum grip length and uniform stress distribution along the entire fastener
- Traditional slotted drive offering compatibility with standard tools for straightforward installation and maintenance
Professional Applications & Engineering Value
This 18-8 stainless steel flat head screw delivers critical performance advantages in demanding applications where corrosion resistance and structural integrity are paramount. The combination of passivated finish and stainless steel material creates a robust barrier against chemical exposure and atmospheric corrosion, significantly extending service life in industrial equipment, marine hardware, and food processing machinery. The UNC coarse threading with Class 2A fit ensures rapid installation and secure fastening even in high-vibration environments, while the 82° countersink angle provides flush mounting for applications requiring smooth surfaces. These flat head slotted screws are engineered to maintain clamping force under continuous stress, making them ideal for critical assemblies where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit for consistent dimensional accuracy. Features 1/4"-20 UNC coarse threads with right-hand direction and full threading along the 5/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for regulated industries and international markets.
