S-91099A463 4-40 x 1 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips 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 passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional tensile strength rated at 80,000 psi ensures reliable performance under high-stress applications
- Precise Class 2A thread fit guarantees smooth installation and secure fastening in coarse UNC threaded holes
- Undercut flat head design provides flush mounting and reduced risk of surface damage during tightening
- 82° countersink angle offers optimal seating in standard countersunk holes for clean, professional finishes
- Full threading along 1-1/4" length enables maximum grip and adjustment flexibility in assemblies
- Phillips drive compatibility allows for efficient installation with commonly available tools
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering advantages in industrial settings where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction prevents oxidation in humid or chemical-exposed environments, while the Rockwell B80 hardness maintains thread integrity during repeated installations. The undercut flat head profile eliminates protrusion issues in precision equipment, and the coarse UNC threading provides rapid assembly in manufacturing lines. Engineers specify these Phillips drive screws for machinery, electronic enclosures, and structural components requiring ASME B18.6.3 compliance and consistent performance under vibration.
Specification Summary & Compliance
This fastener maintains Class 2A thread tolerances per UNC standards with full 1-1/4" threading and 82° countersink angle. Manufacturing strictly adheres to ASME B18.6.3 specifications for dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions and REACH (EC 1907/2006) regulations regarding hazardous substances, ensuring environmental responsibility in industrial supply chains.
