S-91771A861 1/2"-13 x 3" 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
- High tensile strength of 80,000 psi ensures reliable performance under heavy loads and vibration
- Precise Class 2A thread fit provides smooth installation and secure fastening in coarse UNC threaded applications
- Standard 82° countersink angle allows for flush mounting and clean aesthetic finish
- Full threading along the 3" length offers maximum grip and holding power throughout the entire fastener
- Phillips No. 4 drive design enables efficient installation with common tools while reducing cam-out risks
- Rockwell B80 hardness maintains structural integrity and resists deformation during tightening
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 1/2"-13 UNC flat head screws solve critical fastening challenges where corrosion resistance and high strength are paramount. The passivated 18-8 stainless steel construction provides superior protection against rust and chemical exposure in manufacturing, marine, and outdoor equipment applications. The combination of coarse UNC threading and Class 2A thread fit ensures rapid installation and reliable performance in materials where fine threads might strip or fail. The standard 82° countersink angle and flat head profile create seamless surface finishes while the fully threaded design maximizes engagement in thick materials or structural components requiring uniform clamping force distribution.
Specification Summary & Compliance
These flat head screws feature precise Class 2A thread fit according to UNC standards with 3" length and 1/2"-13 coarse thread spacing. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The products are RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety regulations for industrial use.
