S-91857A843 4-40 x 3/8" ASME B18.6.3 Stainless Steel Round Head Slotted Screws
Stainless Steel Round Head Slotted 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 in harsh environments thanks to 316 stainless steel construction and passivated finish
- Exceptional mechanical strength with a 100,000 psi tensile strength and Rockwell B100 hardness for reliable performance under stress
- Precise and reliable fastening ensured by Class 2A thread fit and UNC coarse threading for easier assembly and vibration resistance
- Broad compatibility and easy installation with a standard slotted drive and fully threaded 3/8" length
- Guaranteed quality and safety through compliance with ASME B18.6.3 specifications and environmental standards like RoHS & REACH
- Optimized for industrial use with a rounded head design that reduces snagging and provides a clean, finished appearance
Professional Applications & Engineering Value
This 4-40 UNC Rounded Head Slotted Screw is engineered to solve critical fastening challenges in demanding sectors like marine, chemical processing, and food equipment manufacturing. The core of its value lies in the 316 stainless steel material, which offers far greater resistance to chlorides and acidic environments compared to standard grades, drastically reducing the risk of corrosion-induced failure. The passivated finish further enhances this protective layer, ensuring long-term integrity. The combination of a coarse UNC thread and Class 2A fit provides a robust, vibration-resistant connection that is quick to assemble, minimizing production downtime. Its fully threaded 3/8" length and slotted drive offer versatility and ease of use in tight spaces, making it an indispensable component for maintenance and OEM assembly where reliability and regulatory compliance are non-negotiable.
Specification Summary & Compliance
This screw adheres to precise dimensional and performance standards, including a Class 2A thread fit for consistent assembly and a UNC (Unified Coarse) thread form. It is manufactured in compliance with the ASME B18.6.3 specification, ensuring interchangeability and reliability. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for use in global markets.
