S-91781A553 1/4"-20 x 2 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 for long-lasting performance in harsh environments
- High tensile strength of 80,000 psi ensures reliable load-bearing capacity for demanding industrial applications
- Precise Class 2A thread fit guarantees smooth assembly and secure fastening with UNC coarse threading
- 82° countersink angle provides flush mounting to prevent snagging and improve aesthetic finish
- Partial threading design offers optimal grip strength while reducing material usage and weight
- Rockwell B80 hardness maintains structural integrity under vibration and mechanical stress
- Full compliance with ASME B18.6.3 ensures dimensional accuracy and interchangeability
Professional Applications & Engineering Value
Engineered for precision and durability, this 1/4"-20 UNC Flat Head Slotted Screw solves critical fastening challenges in industrial environments. The combination of 18-8 Stainless Steel and passivated finish provides exceptional resistance to corrosion, oxidation, and chemical exposure, making it ideal for marine, food processing, and outdoor applications. The partially threaded design concentrates thread engagement where needed most, reducing stress concentration while maintaining superior clamping force. With its 82° countersink angle and slotted drive, installation becomes streamlined in confined spaces, while the coarse UNC threading prevents cross-threading during high-speed assembly operations. These features collectively address common issues of fastener failure, corrosion-induced degradation, and installation inefficiency in manufacturing, machinery, and structural applications.
Specification Summary & Compliance
This flat head screw maintains Class 2A thread fit tolerance per UNC standards with precise dimensional control. Manufacturing follows ASME B18.6.3 specifications for consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for global industrial applications.
