S-91099A152 4-40 x 3/16" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head 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
- Exceptional corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Superior holding power from 80,000 PSI tensile strength and Rockwell B80 hardness for reliable fastening in demanding applications
- Precise flush installation enabled by the 82° countersink angle and undercut flat head design
- Optimized thread engagement through Class 2A thread fit and coarse UNC threading for secure connections
- Industry-standard compatibility with ASME B18.6.3 specifications ensuring consistent performance
- Enhanced drive stability with Phillips No. 1 drive style preventing cam-out during installation
- Full regulatory compliance meeting RoHS 3 and REACH environmental standards for global supply chain integration
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where surface-flush fastening and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides superior protection against chemical exposure and atmospheric corrosion, making these Phillips drive screws ideal for electronics enclosures, machinery panels, and marine equipment. The undercut flat head profile ensures complete seating without protrusion, while the coarse thread spacing maintains grip strength in vibration-prone assemblies. With 3/16" length and fully threaded design, these screws offer maximum thread engagement for sheet metal, plastic components, and precision instruments requiring reliable industrial fasteners.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerances ensuring dimensional accuracy. The UNC coarse threads provide optimal performance in most materials, while the 82° countersink angle matches standard chamfered holes. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and global market acceptance.
