S-91771A893 3-48 x 3/4" 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
- 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 long-term performance
- Precise flush installation enabled by 82° countersink angle and undercut flat head design
- Quick assembly efficiency with Phillips No. 1 drive and coarse UNC threading for faster driving
- Consistent thread engagement through Class 2A thread fit and full threading along the 3/4" length
- Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations
- Reduced head protrusion with 0.187" diameter flat head maintaining smooth surface profiles
Professional Applications & Engineering Value
These 3-48 UNC flat head screws deliver critical engineering solutions where surface flushness and corrosion resistance are paramount. The passivated 18-8 stainless steel construction prevents rust and chemical degradation in demanding environments including marine equipment, food processing machinery, and outdoor enclosures. The 82° countersink angle combined with the undercut head profile ensures complete flush mounting without protrusion, eliminating snag points while maintaining structural integrity. With coarse UNC threading and Phillips No. 1 drive, installation speed is optimized without compromising the 80,000 psi tensile strength that prevents stripping or failure under vibration and load. These screws are engineered for precision assemblies requiring both aesthetic cleanliness and mechanical reliability.
Specification Summary & Compliance
Manufactured to exact Class 2A thread fit tolerances with unified coarse 3-48 UNC threading and right-hand direction. Full compliance with ASME B18.6.3 mechanical standards ensures dimensional consistency and performance reliability. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions. The fully threaded 3/4" length provides maximum engagement while maintaining the specified 82° countersink geometry and undercut head profile per industrial fastening specifications.
