S-91781A114 4-40 x 7/8" 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, long-term performance
- Precision thread engagement with Class 2A thread fit and UNC coarse threads ensuring secure fastening and vibration resistance
- Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
- Full threading capability along the entire 7/8" length provides maximum grip and load distribution
- Industry-standard compliance with ASME B18.6.3 specifications for guaranteed dimensional accuracy and interchangeability
- Environmental regulation adherence with RoHS 3 and REACH compliance for safe, sustainable manufacturing
Professional Applications & Engineering Value
These 4-40 UNC flat head slotted screws deliver critical engineering advantages in demanding applications where corrosion resistance and structural integrity are paramount. The combination of 18-8 stainless steel material and passivated finish creates a robust barrier against chemical exposure and atmospheric corrosion, significantly extending service life in marine, chemical processing, and outdoor equipment. The coarse UNC thread profile with Class 2A fit ensures rapid installation and reliable performance in vibration-prone assemblies, while the standard 82° countersink allows for flush mounting in precision machinery and electronic enclosures. These fully threaded fasteners provide uniform stress distribution across the entire 7/8" length, making them ideal for securing components where maximum clamping force is required without compromising material integrity.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerances for consistent dimensional accuracy. Features UNC coarse threads with right-hand thread direction and fully threaded design. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
