S-91781A119 4-40 x 1 1/2" 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
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing applications
- Precision thread engagement through Class 2A UNC coarse threads ensuring secure, vibration-resistant fastening
- Flush mounting capability with standard 82° countersink angle for seamless surface integration
- Full-length threading providing maximum grip and holding power across the entire fastener length
- Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and interchangeability
- Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices
Professional Applications & Engineering Value
These 4-40 UNC flat head slotted screws deliver critical engineering advantages for demanding industrial applications. The combination of 18-8 stainless steel construction and passivated finish provides exceptional resistance to corrosion and chemical exposure, making them ideal for marine, food processing, and outdoor equipment where moisture resistance is paramount. The fully threaded design with Class 2A thread fit ensures maximum thread engagement and vibration resistance in assemblies subject to dynamic loads. The standard 82° countersink angle allows for flush mounting in precision machinery, electronic enclosures, and structural components where protrusion must be avoided. These flat head slotted screws solve common fastening challenges by providing reliable, corrosion-resistant connections that maintain integrity under 80,000 psi tensile loads.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading for optimal engagement. Complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries. Thread specifications include #4-40 UNC right-hand threads with standard flat head profile and slotted drive style.
