S-91857A841 4-40 x 3/16" ASME B18.6.3 Stainless Steel Round Head Slotted Screws
Stainless Steel Round Head Slotted 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 from 316 Stainless Steel construction, ideal for harsh environments and chemical exposure
- Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable load-bearing performance
- Enhanced durability and surface protection through passivated finish, reducing wear and extending service life
- Wide compatibility and easy installation with standard slotted drive and coarse UNC threads for quick assembly
- Precise thread engagement with Class 2A fit ensuring consistent fastening and vibration resistance
- Full-length threading providing maximum grip and holding power across the entire fastener length
- Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for safe industrial use
Professional Applications & Engineering Value
This 4-40 UNC rounded head slotted screw delivers critical engineering value in demanding industrial applications where corrosion resistance and mechanical reliability are paramount. Manufactured from 316 Stainless Steel with a passivated finish, it effectively combats degradation from moisture, chemicals, and salt-laden atmospheres—common challenges in marine, chemical processing, and food industry equipment. The coarse thread design ensures rapid installation and secure fastening in softer materials or where vibration loosening is a concern. With fully threaded construction and 100,000 psi tensile strength, it maintains clamping force under dynamic loads, making it ideal for precision assemblies, electronic enclosures, and machinery components requiring repeated maintenance access.
Specification Summary & Compliance
This rounded head screw features precise 4-40 UNC coarse threads with Class 2A dimensional tolerance for consistent fit. Manufacturing strictly adheres to ASME B18.6.3 specifications governing dimensional requirements and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) restricting hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring environmental responsibility and workplace safety in industrial procurement.
